The three modes of heat transfer are conduction, convection and radiation. Conduction takes place in solids and convection takes place in liquids and gases. Radiation is the mode of heat transfer through vacuum.
What is heat transfer ?Heat will transfer from a hotter region to the colder region due to the differential distribution of temperature. There are three modes of heat transfer namely conduction, convection and radiation. Conduction takes place in solids and convection takes place in liquids and gases. Radiation is the mode of heat transfer through vacuum.
Heat and light is reaching from the sun to earth by radiation. The ground is warming up through the conduction process. Similarly all the solid substances are heating up by conduction.
The water resources are warming up by convection currents, in which the hotter molecules rises above and make the whole liquid warm.
Find more on heat transfer:
https://brainly.com/question/13433948
#SPJ1
a bowling ball lifted off the floor to its shelf has 150 j of potential energy. if the shelf is 5.4 m above the floor, what is the mass of the bowling ball?
The mass of the bowling ball is 6..8 Kg
The formula for potential energy is given by PE = mgh, where m is the mass of the object, g is the acceleration due to gravity (9.8 m/s^2), and h is the height above the ground. We are given that the potential energy of the bowling ball is 150 J and the height is 5.4 m. Solving for the mass, we get:
m = PE / (g × h) = 150 / (9.8 × 5.4) = 6.8 Kg.
So the mass of the bowling ball is 6.8 kg. This calculation assumes that the only force acting on the ball is gravity, and that there is no energy loss due to friction or air resistance.
Learn more about potential energy:
brainly.com/question/24284560
#SPJ4
the plates of a spherical capacitor have radii 38.0 mm and 40.0 mm. (a) calculate the capacitance. (b) what must be the plate area of a parallel-plate capacitor
If the plates of a spherical capacitor have radii 38.0 mm and 40.0 mm then the capacitance is 1.03 × 10^-11 F and the plate area of a parallel-plate capacitor 20 mm square.
A capacitor is an electronic component that stores electrical energy in an electric field. It consists of two conductive plates separated by an insulating material, which is called a dielectric. The conductive plates are usually made of metal and the dielectric can be made of various materials such as paper, ceramic, plastic, or air.
To calculate the capacitance of a spherical capacitor with radii of 38.0 mm and 40.0 mm, we can use the formula:
C = 4πε₀ / (1/R₁ - 1/R₂)
where C is the capacitance, ε₀ is the permittivity of free space (8.85 × 10^-12 F/m), R₁ is the radius of the inner sphere (in meters), and R₂ is the radius of the outer sphere (in meters).
Converting the radii to meters, we have R₁ = 0.038 m and R₂ = 0.04 m. Plugging in these values, we get:
C = 4πε₀ / (1/0.038 - 1/0.04)
= 1.03 × 10^-11 F
To know more about capacitor here
https://brainly.com/question/27393410
#SPJ4
A circuit with a battery, a 4 Ω resistor, a 15 Ω resistor, and a 22 Ω resistor in series. The total current is the system is 8.0 A. What is the voltage drop across the 4 Ω resistor?
Explanation:
The voltage drop across a resistor in a series circuit is equal to the current through the resistor multiplied by the resistance.
The voltage drop across a resistor in a series circuit is equal to the current through the resistor multiplied by the resistance.V = I * R
The voltage drop across a resistor in a series circuit is equal to the current through the resistor multiplied by the resistance.V = I * RV (4 Ω resistor) = 8.0 A * 4 Ω = 32 V.
a sphere completely submerged in water is tethered to the bottom with a string. the tension in the string is one-third the weight of the sphere.
The supplied statement states that the sphere seems to have a density of 750 kg/m³.
What does physics imply by tension?Any physical object in touch with another one has the ability to exert forces on it. We refer to these friction coefficient by various names depending on the kind of contact surfaces. If a ribbon, thread, cable, or string is one among the objects exerting the force, that force is referred to as tension.
Here,
Let V be the sphere's volume
and the density of the spehere is p
density of water , pw = 1000 Kg/m^3
Tension in the rope , T = p * V * g/3
want the sphere to be in balance
T + Weight = buyoant force
p * V * g/3 + p * V * g/3 = pw * V * g/3
p/3 + p = 1000
p = 1000/(4/3)
p = 750 Kg/m^3
The density of the sphere is 750 Kg/m^3
To know more about Tension visit:
https://brainly.com/question/24994188
#SPJ4
The complete question is-
A sphere completely submerged in water is tethered to the bottomwith a string. The tension in the string is one-third the weight ofthe sphere.What is the density of the sphere in kg/m^3?
I need help please pleaseee
The kinetic energy of the simple pendulum at point B is 50 J
What are kinetic energy and potential energy?The kinetic energy of a body is the energy possessed by the body by virtue of its motion.
Kinetic energy is the product of the mass and the velocity of the moving body.
The potential energy of a body is the energy possessed by a body by virtue of its state or position.
Considering the simple pendulum, its energy alternates between kinetic energy and potential energy from point A to C.
At point B, midway through the motion of the pendulum, its energy is a mixture of potential and kinetic energy,
The kinetic energy of the body = 1/2 * 100 J
The kinetic energy of the body = 50 J
Learn more about kinetic energy at: https://brainly.com/question/8101588
#SPJ1
Which BEST explains why how biometrics can change an entire sport?
Biometrics can change an entire sport because if one athlete finds a more efficient movement, other athletes will adopt it. Hence, option (D) is correct.
What is biometrics ?The measuring and statistical examination of an individual's distinctive physical and behavioural traits is known as biometrics. The technology is mostly used for access control, identification, and for locating people who are being watched.
The fundamental tenet of biometric authentication is that each individual may be precisely identified based on inherent physical or behavioral characteristics. The Greek words bio, which means life, and metric, which means to measure, are combined to form the phrase "biometrics."
Learn more about biometrics here:
https://brainly.com/question/20318111
#SPJ1
Your question is incomplete but most probably the options of the question was:
A. Biometrics requires creating a lot of data and other information.
B. Rules and regulations in sports are generally dependent on biometrics.
C. Information about biometrics is regularly published in sports publications.
D. If one athlete finds a more efficient movement, other athletes will adopt it.
a trombone has a variable length. when a musician blows into the mouthpiece and causes air in the tube of the horn to vibrate, the waves set up by the vibrations reflect back and forth in the horn to create standing waves. as the length of the horn is made shorter, what happens to the frequency? assume that the same harmonic is excited.
The length of the horn is made shorter, so the frequency will increase.
The wavelength, which is just a fancy way of saying how far the wave goes, is determined by the length of the horn. In light of this, a short horn tube will result in a short wavelength, and vice versa.
Pitch is defined by numerous properties of sound waves, and these properties depend on one another to establish pitches in musical instruments.
The relationship between the
and wavelength in this instance.
The formula c = fλ, where c is the sound speed through the instrument, f is the frequency, and λ is the wavelength, explains how the relationship between the wavelength and its frequency works.
Assuming that the mouthpiece blower maintains a constant airflow rate, an increase in wavelength will result in a drop in frequency. On the other hand, as the horn's tube gets smaller, the frequency rises.
To know more about frequency click here:
https://brainly.com/question/29739263
#SPJ4
A particle moves horizontally in uniform circular motion, over a horizontal xy plane. At one instant, it moves through the point at coordinates (9.00 m, 9.00 m) with a velocity of -5.00 i hat m/s and an acceleration of +13.5 j hat m/s2. What are the coordinates of the center of the circular path?
From a location 1.20 meters above the circular path, a particle flows horizontally is uniform circular motion upward into the air at a speed of 13.5 m/s.
Is the path of orbit circular?The orbits of the planets are approximately round. Comets have varied shaped orbits. They are extremely irrational or "squashed." They resemble thin ellipses more than they do circles. The moon is one of the satellites that orbits the Earth, but its distance from the planet is not constant.
Why does an electron travel in a circular path?An electron encounters a force that is opposite to the magnetic field's direction and velocity if it moves toward a region with a constant magnetic field (B). Similar to a centripetal force, this force The electron's travel force has a propensity to curve and follow a circular path.
To know more about motion visit
https://brainly.com/question/22810476
#SPJ4
consider the current you measured through the bulb. in 1 second, how many electrons flow through the bulb filament?
Therefore, the number of electrons flowing in 1 second when
1A is [tex]6.25 * 10^{18}[/tex]
current flows through a wire is Current I = 1A
Time t = 1s
charge on 1 electron, Q = [tex]1.6 * 10^{-19} C[/tex]
Let the number of electron be n
we know that I = [tex]\frac{Q}{t}[/tex]
Q = n * e
on substituting the values,
1 = [tex]\frac{n * 1.6 * 10^{-19} }{1}[/tex]
n = [tex]\frac{1}{1.6* 10^{-19} }[/tex]
n = 6.25 * [tex]10^{18}[/tex]
A stream of charged particles—such as electrons or ions—moving through a conductor for electricity or into empty space is known as an electric current. The net rate of passage of electric charge through a surface or into a control volume is used to measure it. Charge carriers are the moving particles, which depending on the conductor could be any number of different types of particles. Often, electrons flowing over a wire serve as the charge carriers in electric circuits. They may be holes or electrons in semiconductors. Ions are the charge carriers in an electrolyte, while electrons and ions make up plasma, an ionized gas.
To know more about electrons click here:
https://brainly.com/question/12001116
#SPJ4
if mass of the object is doubled, what would happen to the centripetal force?
Even if an object's mass doubles, the centripetal force won't change. The centripetal force is not solely dependent on the object's mass, but also on its velocity and the radius of the circular route.
What does centripetal force mean in layman's terms?A centripetal force is any force that shifts the direction of motion in the direction of the center of a circular motion.
The portion of a force that is perpendicular to a velocity is the portion that generates the centripetal force. A centripetal force is a force that keeps a body moving along a curved route. The centripetal force is a constant force that constantly points in the opposite direction of the body's motion as well as in the general direction of the instantaneous center of curvature of the path.
Why does centripetal force exist?With the exception of the Earth's rotation around the Sun, every satellite that orbits a celestial body experiences a centripetal force that is produced by their mutual gravitational pull.
The particle always travels in a direction that is perpendicular to a radial direction since it moves in a circular motion. The effort generated by the centripetal force when travelling in a circle is therefore always zero because the total of two is always equal to zero.
Formula: centripetal force = [tex]mass \times velocity^2 / radius[/tex]
To know more about Centripetal Force visit:
brainly.com/question/14021112
#SPJ4
in an experiment searching for the photoelectric effect, an incident beam of green light did not eject any electrons from a metal. in order to eject electrons, the experimenter should
Increase the frequency of the incident light. The photoelectric effect occurs when light of a sufficient frequency strikes a metal and frees electrons from the metal's surface. The energy of the incident photons must be greater than the energy required to remove the electrons, known as the work function. Thus, increasing the frequency of the incident light will result in higher energy photons, increasing the likelihood of electron ejection in the photoelectric effect.
The kinetic energy of the photoelectrons that are released will grow as the light amplitude increases, according to the wave model of light, yet the measured current will increase as the frequency increases. In contrast to expectations, studies revealed that raising the light's frequency and amplitude raised the current and the photoelectrons' kinetic energy, respectively.
For more questions like Photoelectric effect visit the link below:
https://brainly.com/question/28495644
#SPJ4
a refrigerator with a coefficient of performance of 0.25 removes 200 j of energy from the cold reservoir each second. in one second, how much energy does the refrigerator use?
The refrigerator use 1000 J energy in each second with a performance coefficient 0.25, a refrigerator draws 200 j from the cold reservoir every second.
The ratio of effort (energy) required to usable heating or cooling provided is known as the coefficient of performance, or COP, of a heat pump, refrigerator, or air conditioning system. More COPs translate into greater effectiveness, less energy (power) usage, and hence cheaper operational costs.
We know that,
Coefficient of performance(COP) = Q/W = 0.25 (Given)
Q = removal of energy from the cold reservoir = 200 J (Given)
W = work done in each second
Hence,
W = Q/COP = 200/0.25 = 800
Now the total energy in use (E) = removal of energy + work done
Hence,
E = Q+W = (200 + 800) J = 1000 J.
To know more about coefficient of performance
brainly.com/question/13437066
#SPJ4
a roller coaster starts at a point 30 m above the ground with a speed of 25m/s. what will be the speed of the coaster at the top of the next slope, which is 45 m above the ground, to the nearest whole number? ignore friction.
The speed of the roller coaster at the top of the next slope which is at a distance of 45 m above the ground is 19.18 m/s
The roller coaster distance from the ground at starting point = 30 m
The speed of the roller coaster at starting point = 25 m/s
The distance of the roller coaster from the ground in the next slope = 45 m
The speed of the roller coaster at the top of the next slope can be found using the conservation of energy
K₁ + U₁ = K₂ + U₂
1/2mu² + mgh₁ = 1/2mv² + mgh₂
1/2u² + gh₁ = 1/2v² + gh₂
where u is the initial velocity
v is the final velocity
Let's substitute the known values in the above equation, we get
1/2 x 25² + 9.8 x 30 = 1/2v² + 9.8 x 45
312.5 + 294 = 1/2v² + 441
606.5 = 1/2v² + 441
165.5 = 1/2v²
v² = 165.5 x 2
v² = 331
v = √331
v = 18.19 m/s
Learn more about the conservation of energy in
https://brainly.com/question/13949051
#SPJ4
If you have 200 lbs of coal in your shed and you burn 1 lb a day, how long will it last? a. 200 days b. forever c. 20 days
The provided statement declares that the amount of coal will only last 200 days.
What materials make up coal?It mostly consists of carbon and compounds, which may release energy through combustion (burning). The most common oil and coal in the US is coal, which is also the world's greatest energy source for producing power.
Coal is measured in pounds, and one pound is equivalent to one pound. When there are many pounds, the measurement is made in pounds.
Now ,
Total amount of coal = 200 lb
Volume of coal used per day = 1 lb
Therefore,
The required number of day the coal will last = ( total volume of coal )÷ ( Volume of coal uses each day )
= 200lbs ÷ 1
=200
The provided volume of coal will thus last for 200 days.
To know more about Coal visit:
https://brainly.com/question/6677981
#SPJ4
you toss a tennis ball straight upward. at the moment it leaves your hand it is at a height of 1.3 m above the ground, and it is moving at a speed of 8.2 m/s. (a) how much time does it take for the tennis ball to reach its maximum height?
The tennis ball takes approximately 0.582 seconds to reach its maximum height. The problem can be solved by putting the values of velocity, time and acceleration due to gravity in the formula of height.
To find the time it takes for the tennis ball to reach its maximum height, we can use the equation for vertical motion under constant acceleration, which is given by:
h = v0t - (1/2)gt^2
where h is the height, v0 is the initial velocity, t is the time, g is the acceleration due to gravity (9.8 m/s^2), and t is the time.
In this case, we know the initial height and velocity, so we can solve for the time it takes to reach the maximum height (when the velocity is equal to 0 m/s):
h = v0t - (1/2)gt^2
1.3 = 8.2t - (1/2)(9.8)(t^2)
Rearranging and solving for t, we get:
4.9t^2 - 8.2t + 1.3 = 0
t = 0.582 s
So it takes approximately 0.582 seconds for the tennis ball to reach its maximum height.
Learn more about motion here:
https://brainly.com/question/12640444
#SPJ4
earth’s mass m is 5.979×1024 kg, and its radius r is 6.376×106 m. what is the angular momentum of the earth?
The angular momentum of the Earth is approximately [tex]7.16*10^{33} Kg[/tex] [tex]m^{2} /s[/tex]
Does angular momentum affect the motion of an object?Yes, angular momentum affects the motion of an object. Angular momentum is a measure of an object's rotational motion and its tendency to continue rotating. It is a vector quantity that is proportional to the angular velocity of an object and the moment of inertia of the object.
What does law of conservation of angular momentum say?According to the law of conservation of angular momentum, the total angular momentum of a closed system remains constant if no external torque acts on it.
The angular momentum of a rotating body can be calculated using the formula: L = Iω
L = (2/5)m([tex]r^{2}[/tex]) * (2π / 86,400)
L = (2/5) * (5.979 × [tex]10^{24}[/tex] kg) * (6.376 × [tex]10^{6}[/tex] [tex]m)^{2}[/tex] * (2π / 86,400 s)
L = 7.16 × [tex]10^{33}[/tex] kg [tex]m^{2}[/tex]/s
Therefore, the angular momentum of the Earth is approximately [tex]7.16*10^{33} Kg[/tex] [tex]m^{2} /s[/tex]
To know more about inertia visit:
https://brainly.com/question/3268780
#SPJ4
a negatively charged rod is brought in contact with an electroscope. as the rod gives up electrons, the numebr of protons in the rod will -
The number of protons in the rod will not change as a result of bringing it in contact with an electroscope.
Protons are positively charged particles and are held tightly within the nucleus of an atom. They cannot be gained or lost through contact with an electroscope or any other external object. When a negatively charged rod is brought into contact with an electroscope, electrons are transferred from the rod to the electroscope, causing the electroscope to become negatively charged. This transfer of electrons changes the charge distribution of the rod and the electroscope, but it does not change the number of protons in the rod.
You can learn more about Protons at
https://brainly.com/question/1805828
#SPJ4
the acceleration due to gravity near the surface of the moon is about one-sixth of the value near the earth's surface. if a rock were dropped from equal heights on the moon and earth, the time it would take the rock from the moon to hit the ground would be
The expression for time it would take the rock from the moon to hit the ground, [tex]t_m = \sqrt{6} t_e[/tex].
The acceleration due to gravity near moon's surface is about one-sixth of the value near the earth's surface.
The Newton's second law says,
[tex]s = ut +\dfrac{1}{2}a t ^2[/tex]
This means acceleration is inversely proportional to square of time.
[tex]\dfrac{a_e}{a_m} = \dfrac{t_m^2}{t_e^2}[/tex]
where, [tex]a_e[/tex], [tex]a_m[/tex] is the acceleration at earth and moon respectively.
and, [tex]t_e[/tex], [tex]t_m[/tex] is the time at earth and moon respectively.
[tex]a_m = \dfrac{1}{6} a_e[/tex]
Hence, [tex]t_m = \sqrt{6} t_e[/tex].
To know more about the acceleration, here
brainly.com/question/13860566
#SPJ4
during a baseball game, a batter hits a popup to a fielder a distance d m away. the acceleration of gravity is 9.8 m/s 2 . if the ball remains in the air for a time t seconds, how high does it rise? caution: t includes both the rising time and the falling time. select all that apply
Its value on Earth is 9.8 m/s2. In those other words, the acceleration of gravity at sea level on the surface of the earth is 9.8 m/s2. Discussing the acceleration of gravity, that location has an impact on the value of g.
Is the speed of gravity 9.8 meters per second?velocity of the ball. Horizontal Range r=(ucosθ).t where t is time of flight. Substituting given values77=5.2×ucosθ⇒ucosθ=775.2=14.807ms
How is speed determined?At a given speed, something or someone is moving. If you know how far something has traveled and how long it took to get there, you can calculate its average speed. By the distance being divided by the time, one may calculate speed. Knowing the units of distance and time is a prerequisite for calculating the units of speed.
To know more about gravity visit:
https://brainly.com/question/14874038
#SPJ4
how much work does a supermarket checkout attendant do on a can of soup he pushes 0.550 m horizontally with a force of 5.80 n? express your answer in joules and kilocalories. (you do not need to enter any units.)
So the supermarket checkout attendant does 3.189 J (or 0.76 kilocalories) of work on the can of soup.
The work done by a force on an object is given by the equation:
work = force * distance * cos(θ)
where force is the applied force, distance is the displacement of the object, and θ is the angle between the force and the displacement.
In this case, the force is 5.80 N, the distance is 0.550 m, and the angle between the force and the displacement is 0 degrees (the force and the displacement are in the same direction), so:
work = 5.80 N * 0.550 m * cos(0°)
= 3.189 J
To convert the work from joules to kilocalories:
work in kilocalories = work in J / 4184
work in kilocalories = 3.189 J / 4184
= 0.76 kilocalories
For such more question on work done
https://brainly.com/question/8119756
#SPJ4
On what scale does water freeze at 0?
Water has a freezing point of zero degrees and a boiling point of one hundred degrees on the Celsius temperature scale. A brine solution's freezing point is set at zero degrees Fahrenheit, while that of water is 32 degrees.
How cold is ice-cold water?It comes in the forms of hail, frost, snow, and sleet. 0 degrees Celsius is the freezing point of water (32 degrees Fahrenheit). The molecules of water start to enlarge as the temperature approaches the freezing point.
How do freezing and melting points differ?The temperature at which a substance becomes liquid or solid is known as the melting or freezing point of that substance. Depending on the degree of bonding between the particles and their mass, different substances have varying melting points.
Is 0 always the freezing point?Water typically has a freezing point and melting point of 0 °C or 32 °F. If supercooling takes place or there are pollutants in the water that could cause freezing point depression to happen, the temperature may be lower. Water can remain a liquid at temperatures as low as -40 to -42°F under some circumstances.
To know more about freezing point visit;
https://brainly.com/question/40140
#SPJ4
the 10-mg truck hauls the 20-mg trailer. if the unit starts from rest on a level road with a tractive force of 20 kn between the driving wheels of the truck and the road, compute the tension t in the horizontal drawbar and the acceleration a of the rig.
Tension in the horizontal drawbar is 13.4 N and the acceleration of the rig is 0.00067 m/s².
What is tension?In physics, tension is the pulling force transmitted axially by the means of a string or a rope.
The tension T in the horizontal drawbar is given by the equation:
T = (m_truck * a + m_trailer * a) / 2, where m_truck and m_trailer are the masses of the truck and trailer, respectively, and a is their acceleration.
F_net = F_tractive - F_friction = m_total * a, where m_total is the total mass of the rig (m_truck + m_trailer).
m_total = 30 kg
a = F_tractive / m_total = 20 kN / 30 kg = 0.00067 m/s²
T = (10 kg * 0.00067 m/s² + 20 kg * 0.00067 m/s²) / 2 = 13.4 kg * m/s² = 13.4 N
So, the tension in the horizontal drawbar is 13.4 N and the acceleration of the rig is 0.00067 m/s².
To know more about tension, refer
https://brainly.com/question/24994188
#SPJ4
write any two conditoons at which a body of certain mass become weightless
A body of a certain mass could become weightless in the following two conditions:
1. In microgravity
2. In neutral buoyancy
Cheers,
qxxi
The position of the front bumper of a test car under microprocessor control is given by x(t)=2.17m+(4.80m/s2)t2?(0.100m/s6)t6.a. Find its position at the first instant when the car has zero velocity.b. Find its acceleration at the first instant when the car has zero velocity.c. Find its position at the second instant when the car has zero velocity.d. Find its acceleration at the second instant when the car has zero velocity.
Using velocity and acceleration, a. To determine the location of the car when its velocity is zero, we must identify the roots (time instances) of the velocity equation, which is the first derivative of the position equation.
The velocity equation is as follows: [tex]v(t) = (9.60m/s^3) t - (0.600m/s^7)t^7.[/tex]
What numerical techniques may we use to find an equation's roots?To find the roots of this equation, we can use numerical techniques like Newton-Raphson or bisection. The velocity equation can also be seen to be a seventh-degree polynomial with up to seven roots. By setting the velocity equation to zero and calculating the root, we can apply a numerical solution or perform a hand calculation to obtain the first root (i.e., the first time the car has zero velocity).
b. The formula for the acceleration equation, which is the second derivative of the position equation, is: [tex]a(t) = (9.60m/s^2) - (6.00m/s^6)[/tex][tex]t^6[/tex]
c. and d. To discover the acceleration at the second time occurrence when the car has zero velocity, find the second root by repeating step a and using the acceleration equation to find the acceleration.
To know more about acceleration visit:
brainly.com/question/12550364
#SPJ4
in what direction is the polar bear moving? express your answer as an angle measured in degrees below the negative x-axis.
The polar bear is travelling in the direction of the south at a speed of 21.24 km/h, making an angle of 279.4° below the negative x axis.
What is velocity?The direction of movement of the body or item is defined by velocity. Speed is fundamentally a scalar number. Velocity is, in essence, a vector quantity. It is the pace at which distance changes. It is the displacement rate of change. The velocity of an object is the rate at which its location changes in relation to a frame of reference and is a function of time. Velocity is similar to a speed and direction of motion specification (e.g., 60 km/hr to the north).
Here,
a. To find the magnitude of the velocity vector, we can use the Pythagorean theorem:
v = √(u_x² + u_y²)
= √((-15.5² + (-14.5)²)
= √(242.25 + 210.25)
= √(452.5)
= 21.24 km/h
b. To find the direction of the velocity vector, we can use the arctangent function:
θ = atan(2(u_y, u_x))
= atan(2(-14.5, -15.5))
= -80.6°
Note that atan2 returns the angle in the range (-π, π), so we add 360° to make the angle measure positive:
θ = 360° - 80.6°
= 279.4° below the negative x axis.
The polar bear is moving in south direction with speed of 21.24 km/h making an angle of 279.4° below the negative x axis.
To know more about velocity,
https://brainly.com/question/14326156
#SPJ4
Complete question:
The velocity of a polar bear is given by vector u = ( -15.5 km/h, -14.5 km/h).
a. how fast is the polar bear moving in km/h ? (v = ???)
b. in what direction is the polar bear moving? express your answer as an angle measured in degrees below the negative x axis.
Identify the following physical quantities as scalars or vectors.speeddistancevelocitypositiondisplacementaverage velocityacceleration
Speed, distance, and position are scalar quantities, while velocity, displacement, average velocity, and acceleration are vector quantities.
Speed refers to how fast an object is moving and is a scalar quantity, with only magnitude, without direction. Distance is a scalar quantity that refers to the amount of space between two points, also having only magnitude.
Position is a scalar quantity that refers to the location of an object in space and also has only magnitude.
Velocity, on the other hand, is a vector quantity, as it has both magnitude and direction. It is the rate of change of an object's position over time.
Displacement is another vector quantity, and it refers to the change in position of an object from its starting point.
Average velocity is a vector quantity that is the average of all velocity changes during a certain time interval.
Acceleration is also a vector quantity and refers to the rate of change of velocity. It measures how quickly the velocity of an object changes, and like velocity, it has both magnitude and direction.
Learn more about scalar here:
https://brainly.com/question/24853230
#SPJ4
how much work must be done on the gas to compress it to one third of its initial volume at constant temperature?
At a constant temperature, the gas must undergo 5500 J worth of work to be compressed to just one-third of its initial volume.
What is temperature and heat?Temperature is a measurement of the total power of the movements of the molecules in a substance, whereas heat is the energy needed of those motions.
What is temperature and definition for kids?The degree of heat in a substance is its temperature. By figuring out the average kinetic energy contained in either a material's molecules, it is measured using a thermometers, a tube of a material that is temperature-sensitive, such as mercury. The energy produced by the rate at which molecules inside a solid, liquid, and gas is known as kinetic energy.
To know more about temperature visit:
brainly.com/question/27149681
#SPJ4
a sprinter can accelerate with constant acceleration for 2.20 s before reaching top speed. he can run the 100-meter dash in 10 s. what is his speed as he crosses the finish line?
The sprinter's speed as he crosses the finish line is:14.14 m/s
The time it takes for the sprinter to run the 100-meter dash is 10 seconds, minus the time it takes to reach top speed:
t = 10 s - 2.20 s = 7.80 s
The distance travelled during the time t can be calculated using the equation:
d = v0 * t + 0.5 * a * t^2
Where v0 is the initial velocity (0 m/s), a is the acceleration, and t is the time. Since we don't know the value of a, we'll solve for it using the final velocity and distance:
a = 2 * (d - v0 * t) / t^2
The final velocity can be calculated using the equation:
v = v0 + a * t
Plugging in the values, we get:
v = v0 + a * t = v0 + 2 * (100 m - v0 * 7.80 s) / 7.80 s^2
So the sprinter's speed as he crosses the finish line is:
v = sqrt(200 * 7.80 / 7.80^2) = sqrt(200) = 14.14 m/s
Learn more about speed here: https://brainly.com/question/13943409
#SPJ4
an object is 10 m above the ground and is moving at 10 m/s. it has only potential energy. true or false
An object is 10 m above the ground and is moving at 10 m/s. it has only potential energy.
The above statement is False.
Potential energy is the power held in reserve by a moving object.
The mass of the item determines the gravitational potential energy
(PEgrav = m•g•h), whereas the spring constant and the length of the spring's compression or stretch determine the elastic potential energy (PEelastic = 0.5•k•x2).
The mass of an object determines how much gravitational potential energy it has.
An object will possess more potential energy the higher it is.
Like the equation states that
PEgrav = m•g•h, meaning that PE and height are closely correlated.
For more question on potential energy click onhttps://brainly.com/question/14427111
#SPJ4
the charge of 196 nc is uniformly distributed over the top surface of a circular plastic disk of radius 10.3 cm. what is the magnitude of the electric field on the axis of the disk at a distance of 11.3 cm from the disk's center?
The magnitude of the electric field on the axis of the disk at a distance of 11.3 cm from the disk's center is [tex]6.62 x 10^4 N/C.[/tex]
Does electric field affect the magnetic field?Yes, an electric field can affect a magnetic field. Electric and magnetic fields are closely related and can interact with each other to produce electromagnetic phenomena.
What does Maxwell equation states?According to Maxwell's equations, a changing electric field creates a magnetic field, and a changing magnetic field creates an electric field. This means that the presence of an electric field can cause a change in a magnetic field, and vice versa.
The given numerical can be solved:
E = k * Q / (2 * R * h)
Replacing the given values, we get:
E = [tex](8.99 x 10^9 N \times m^2 / C^2) \times (196 x 10^-9 C) / (2 \times 0.103 m \times 0.113 m) = 6.62 x 10^4 N/C[/tex]
So the magnitude of the electric field on the axis of the disk at a distance of 11.3 cm from the disk's center is[tex]6.62 x 10^4 N/C.[/tex]
To know more about current, visit here:
brainly.com/question/13076734
#SPJ4