Supplies will be dropped from a rescue plane 220 metres below. if the aircraft is moving at 80 metres per second So the magnitude of the velocity of the supply when it lands is 65.076 m/s.
The velocity of an object under constant acceleration (in this case, due to gravity) can be found using the equation
v = v_0 + a * t
where v is the final velocity, v_0 is the initial velocity,
a is the acceleration (in this case, due to gravity,
which has a magnitude of 9.8 m/s^2),
and t is the time it takes for the object to fall.
To find t, we can use the equation:
d = v_0 * t + 0.5 * a * t^2
where d is the distance the object falls.
Solving for t:
t = √(2d/a)
= √(2 * 220 m / 9.8 m/s^2)
= 6.62 s
Now we can plug the value of t back into the equation for v:
v = v_0 + a * t
= 0 + 9.8 m/s^2 * 6.62 s
= 65.076 m/s
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if the wire has a diameter of 0.7 in. , determine how much it stretches when a horizontal force of 2.5 kip acts on the pole.
A horizontal force is one that moves in a direction perpendicular to the horizon.
If we exert a horizontal force, when?Apply the equilibrium equation at C.ΣΜ =025x4-7, sin 30°x7=010-3.57=0 TR₁ = 2.857 kipCalculate the length of the steel wire (1)7cos 30° = 8.083 ftCalculate the stretch/elongation in the wire, using the following for AE2.857x(8.083×12 (022 * 29000-0.3042 inusing this and it is constantly perpendicular to the contact area.
What kind of thing is horizontal?A line going form left to right is referred to as a horizontal line. The sunrise is seen across a horizontal line when it appears over the horizon. A perfect example of the a horizontal line is the x-axis.
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efficient estimation of word representations in vector space
A set that is closed under finite scalar and vector addition is known as a vector space, or V.
What is vector space?The fundamental illustration is an n-dimensional Euclidean space Rn where each element is represented by a list of n real numbers, scalars are real numbers, addition is componentwise, and scalar multiplication is multiplication on each term individually.
Scalars are constituents of a field F in a general vector space, in which case V is referred to as a vector space over F.
A set whose elements, frequently termed vectors, can be added to and multiplied ("scaled") by figures known as scalars is referred to as a vector space (also known as a linear space).
Therefore, A set that is closed under finite scalar and vector addition is known as a vector space, or V.
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A figure skater begins spinning counterclockwise at an angular speed of 4.1 π rad/s. During a 4.5 s interval, she slowly pulls her arms
inward and finally spins at 7.1 π rad/s.
What is her average angular acceleration
during this time interval?
Answer in units of rad/s^2.
The average angular acceleration of the skater is 2.1 rad/s².
What is the average angular acceleration of the skater?
The average angular acceleration of the skater is calculated by applying the following formula.
a = Δω / Δt
where;
Δω is change in angular speedΔt is change in time of motiona = ( ω₂- ω₁ ) / ( t₂ - t₁ )
where;
ω₁ is the initial angular speedω₂ is the final angular speedt₁ is initial timet₂ is final timea = ( 7.1π - 4.1π ) / ( 4.5 )
a = 2.1 rad/s²
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a nuclear of 208pb has 82 protons with a sphere of radius 6.34 * 10^-15m. calculate the electric field at the surface of the nucleus
A nuclear of 208pb has 82 protons with a sphere of radius 6.34 * [tex]10^{-15}[/tex]m. The electric field at the surface of the nucleus is 2.24 x [tex]10^{11}[/tex] N/C.
The electric field at the surface of a nucleus can be calculated using Coulomb's law, which states that the electric field produced by a point charge is proportional to the charge and inversely proportional to the square of the distance from the point charge.
E = k * q / [tex]r^{2}[/tex]
where,
E = the electric field in N/C
k = the Coulomb constant, equal to 8.99 x [tex]10^{9}[/tex] N [tex]m^{2}[/tex] / [tex]C^{2}[/tex]
q = the charge on the nucleus, equal to 82 times the charge on a proton, or 82 * 1.60 x [tex]10^{-19}[/tex] C
r is the radius of the nucleus, equal to 6.34 x [tex]10^{-15}[/tex]m
Plugging in these values, we get:
E = 8.99 x [tex]10^{9}[/tex] N [tex]m^{2}[/tex] / [tex]C^{2}[/tex] * 82 * 1.60 x [tex]10^{-19}[/tex] C / 6.34 x [tex]10^{-15}[/tex]m ^2
E = 2.24 x [tex]10^{11}[/tex] N/C.
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which person is weightless? which person is weightless? a child in the air as she plays on a trampoline. a scuba diver exploring a deep-sea wreck. an astronaut on the moon.
The weightlessness of a toddler playing on a trampoline in the air.
During the activities depicted, who is weightless?Since only the diver is falling freely, she is the only one who is weightless (aka the only person fully in the air.)
What exactly is kinetic energy, and what are two examples?Pick the appropriate kinetic energy definition and two illustrations. An object's kinetic energy is the energy it has as a result of its location. Examples include the motion of the liquid molecules in a cup of hot coffee or an automobile that is resting on a hill. An object's kinetic energy is the energy it has as a result of motion.
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what is the difference between a conductor and an insulator in terms of electrons?
Conductors and insulators are materials classified based on their ability to conduct electricity. In a conductor, electrons are free to move and flow easily. In an insulator, electrons are tightly bound and do not move freely.
Does insulator restrict electrons flow?Yes, insulators restrict the flow of electrons. In insulators, electrons are tightly bound to their atoms and do not move freely, making it difficult for an electric current to flow through the material.
What is the significance of conductors?Conductors play a significant role in many areas of technology and science. They are materials that allow electrons to move freely. Because of this property, conductors are used extensively in electrical and electronic systems to transfer or control electric currents.
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a spring does 800 j of work on a marble to launch it across a horizontal floor. it applies 200 n of force. how far does the marble travel?
Use the formula work = force x distance to calculate the marble's travel distance. Distance in rearranging equals work / force. Distance = 800 J / 200 N = 4 m after plugging in the values.
What pressure does the spring exert on the marble?
The spring exerts a 200 Newton force on the marble. This is a gauge of the force being exerted on the marble and is based on how much work the spring is putting in.
The spring is exerting 800 Joules of energy in this instance to propel the marble across a horizontal floor. The forcethe spring applies is directly proportional to the amount of work it is doing, so as the amount of work increases, the force
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an automobile travels on a straight road for 18km at 31 km/h. it then continues in the same direction for another 18km at 62 km/h. what is the average velocity of the car during this 36 km trip?
The average velocity of the car during this 36 km trip was 41.1 km/h.
The average velocity of an object over a certain distance is given by the total distance traveled divided by the total time taken to travel that distance.
In this case, the first part of the trip took 18 km / 31 km/h = 0.581 hours. The second part of the trip took 18 km / 62 km/h = 0.290 hours. The total time taken for the entire trip was 0.581 + 0.290 = 0.871 hours.
The total distance traveled was 18 km + 18 km = 36 km.
Therefore, the average velocity of the car during this 36 km trip was 36 km / 0.871 hours = 41.1 km/h.
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for the bulbs connected in parallel: how does the current through each bulb compare to the total current leaving/entering the battery? what do you think is the underlying reason for this?
The current through each bulb in a parallel circuit is equal to the total current leaving/entering the battery, and this is because in a parallel circuit, the voltage across each component is the same, and the total current is equal to the sum of the currents through each component.
When bulbs are connected in parallel circuit, each bulb has the same voltage across it, which is equal to the voltage of the battery. This means that the current through each bulb depends only on the resistance of that bulb and is independent of the other bulbs in the circuit. Therefore, the total current flowing into the parallel circuit is equal to the sum of the currents flowing through each bulb.
This is in contrast to a series circuit, where the total current is shared by all the components and is the same at any point in the circuit. The reason for this difference is the different ways in which current and voltage are distributed in parallel and series circuits.
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the capacitor has a plate area of 10.0cm2 and a plate spacing of 2.00mm . the dielectric constant for the inserted material is 3.00 . if the potential between the plates exceeds 150.0v , the capacitor discharges and fails. what is the maximum charge that the capacitor can have after the dielectric is inserted?
The required maximum charge that the capacitor can have after the dielectric is inserted Q ≈ 1.98 x 10^-8 C
How to use formula of capacitance to find charge?The capacitance of a parallel-plate capacitor is given by:
C = ε * ε0 * A / d
where
C is the capacitance (in Farads)
ε is the dielectric constant of the material between the plates
ε0 is the vacuum permittivity (8.854 x 10^-12 C^2/Nm^2)
A is the plate area (in m^2)
d is the plate spacing (in meters)
The maximum charge that can be stored in a capacitor without exceeding a given voltage V is given by:
Q = C * V
where Q is the charge (in Coulombs).
According to data:So, first we need to convert the plate area and plate spacing to SI units:
A = 10.0 cm^2 = 10.0 x 10^-4 m^2
d = 2.00 mm = 2.00 x 10^-3 m
Next, we can find the capacitance:
C = ε * ε0 * A / d
C = 3.00 * 8.854 x 10^-12 * 10.0 x 10^-4 / 2.00 x 10^-3
C ≈ 1.32 x 10^-10 F
Finally, we can find the maximum charge:
Q = C * V
Q = 1.32 x 10^-10 * 150.0
Q ≈ 1.98 x 10^-8 C
So, the maximum charge that the capacitor can have after the dielectric is inserted is approximately 1.98 x 10^-8 Coulombs.]
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if the airspeed of the plane (its speed in still air) is 450.0 km/h , in which direction should the pilot head?
The plane's speed relative to the ground when airspeed of the plane is given is calculated to be 329.64 km/h and the direction is 79.74° West or North.
Airspeed of the plane = 450 km/h
Wind speed is 80 km/h in a south direction.
The pilot should head in the direction,
OA = AB × cos θ
cos θ = OA/AB = 80/450 = 0.178
θ = 79.74°
When the airspeed is 450 km/h the pilot must head 79.74° West or North.
The speed of the plane in relation to the ground is,
OB = AB × sin θ
OB = 335 × sin (79.74°)
OB = 329.64
Therefore, the plane's speed relative to the ground is 329.64 km/h.
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A snail travels 24.5 cm/hr. The snail accelerates itself to 28.2 cm/hr in 23.4 min. What is the acceleration of the snail? Convert minutes to hours by dividing 23.4 min by 60 before solving the problem.
The acceleration of the snail is 9.49 cm/hr².
What is acceleration?Acceleration is a vector quantity considered as the rate at which an object's velocity varies. If an object's velocity changes, it is accelerating.
To find the acceleration of the snail, we need to find the change in velocity (Δv) and divide it by the time it took for that change to occur (Δt).
First, convert the time from minutes to hours:
23.4 min ÷ 60 min/hr = 0.39 hr
Now, the change in velocity:
Δv = 28.2 cm/hr - 24.5 cm/hr = 3.7 cm/hr
Finally, we'll divide the change in velocity by the time it took to get the acceleration:
a = Δv / Δt = 3.7 cm/hr / 0.39 hr = 9.49 cm/hr²
So, the acceleration of the snail is 9.49 cm/hr².
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I took a picture of how they want the question answered
The amount of work done by the applied force is 500 J.
How much work is done by the applied force?The amount of work done by the applied force is equal to the product of the applied force and the displacement of the object.
Mathematically, the formula for work done by an applied force is given as;
W = F d
where;
F is the applied forced is the displacement of the objectThe amount of work done by the applied force is calculated as;
W = 50 N x 10 m
W = 500 J
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g a copper wire that is 3.14 m long with a diameter of 2 cm has an electrical resistance of 10 ohms. if this wire is cut exactly in half (equal length), what is the electrical resistance of each wire piece?
The resistance of the copper wire when the length of the wire is halved is 5 ohms
The length of the copper wire = 3.14 m
The diameter of the wire = 2 x 10⁻² m
The resistance of the wire = 10 ohms
The electrical resistance of the wire if the length of the wire is cut in half is
R = ρ L / A
where R is the resistance of the copper wire
ρ is the resistivity
L is the length of the copper wire
A is the area of the copper wire
We can see that the resistance is directly proportional to the length of the copper wire in the above equation.
Thus, if the length of the wire is cut in half, then the resistance of the wire will also be reduced by half the value.
Resistance = 10 ohms / 2
= 5 ohms
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a merry-go-round rotates at the rate of 0.1 rev/s with an 97 kg man standing at a point 1.6 m from the axis of rotation. what is the new angular speed when the man walks to a point 0 m from the center? consider the merry-go-round is a solid 72 kg cylinder of radius of 1.6 m. answer in units of rad/s.
The new angular speed when the man walks to a point 0m from the center is ω = 0.369 rev/s.
What Is Angular Speed?The definition of angular speed is the rate at which angular displacement changes, and it is expressed as,
ω=θ/t
where t is the period of time, is the angular speed, and ω is the angular displacement.
Angular Speed UnitRadian per second is used to measure angular speed. Both angular velocity and angular speed are represented using the same formula.
Now for the given question,
Since there is no external torque, angular momentum of the system is conserved. Then, the angular momentum when the man is at x = 1.6 m, it is equal to that of x = 0 m.
[tex]L_1=L_2\\I_1ω_1=I_1ω_2[/tex]
where I is the moment of inertia of the system. Here we consider the merry-go-round which is a solid cylinder and the man which can be regarded as a point object.
Total moment of inertia in first case is
[tex]I_1=I_{cylinder}+ I_{man}= 1/2 m_{cylinder}R^2_{cylinder}+m_{man}d^2\\ = 1/2 (72)(1.6)^2+(97)(1.6)^2=340.48[/tex]
moment of inertia in second case is
[tex]I_2=1/2 m_{cylinder}R^2_{cylinder}+ m_{man}(0)\\=1/2(72)(1.6)^2=92.16[/tex]
In the second case, the man shows no contribution to the moment of inertia of the system, since he stands on the center.
Finally,
[tex]I_1ω_1=I_2ω_2\\(340.48)(0.1)=(92.16)ω_2\\ω_2=0.369 rev/sec.[/tex]
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How are physical quantities classified as scalars and vectors?
Physical quantities can be classified as scalars or vectors based on their ability to describe magnitude and direction. Scalar quantities solely have magnitude and do not have direction. Vector quantities are the quantities that have both magnitude and direction.
What are some examples of vectoir quantities?Vector quantities are physical quantities that include both magnitude and direction. Some common examples of vector quantities include: Velocity, Displacement, acceleration, Electric field, etc.
Is force a vector quantity?Yes, force is a vector quantity. Force is a quantity that describes the interaction between two bodies, with a direction that indicates the direction of the interaction.
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what tracking system did the u.s. department of defense create that uses satellites to support navigation?
The U.S. Department of Defense created a satellite-based navigation system called the Global Positioning System (GPS). The GPS system provides positioning accuracy to within a few meters, making it a crucial tool for navigation and positioning in many different applications.
What is a GPS system?GPS is a worldwide navigation system that uses a network of satellites to provide precise positioning, velocity, and time information to users on the ground, in the air, or at sea. The system was originally developed for military use, but today it is widely used.
How does a GPS work?GPS uses a constellation of satellites orbiting the Earth that transmit signals to GPS receivers on the ground. The receiver calculates its position by determining the time delay between the signals from different satellites .
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how far must you walk toward speaker b to move to reach the first point of destructive interference? take the speed of sound to be 344 m/s . express your answer in meters.
0.2425 m you walk toward speaker b to move to reach the first point of destructive interference.
Calculating the problem:The following formula can be used to determine the wavelength:
λ = v/f, where f is the frequency of the sound wave and v is the speed of sound.
When we change the values, we get: λ = 344 m/s / 708 Hz = 0.485 m
The distance between the two points of constructive and destructive interference is equal to half the wavelength, or λ/2,
d = λ/2 = 0.485 m / 2 = 0.2425 m = 243.5 cm
We need to walk 243.5 cm in the direction of speaker B in order to reach the first point of destructive interference, as d = λ/2 = 0.485 m / 2 = 0.2425 m.
How does wavelength work?A wavelength is the distance between two identical points (adjacent crests) in consecutive cycles of a waveform signal that travels through space or down a wire. In wireless systems, this length is typically measured in meters (m), centimeters (cm), or millimeters (mm). The relationship between frequency and wavelength .
The wavelength of a signal decreases with increasing frequency. For gamma radiation (), visible light (UV), infrared (IR), and ultraviolet (UV) (nm), the wavelength is more frequently mentioned in nanometers.
For instance, a water wave is one that combines transverse and longitudinal motions. An electromagnetic wave is produced when an electric field and a magnetic field vibrate together.
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What is accurate about seismic waves moving through the Earth?S-waves (also called shear-waves) move through neither solids nor liquids.S-waves (also called shear-waves) move through solids and all liquids except Diet Pepsi.Correct!S-waves (also called shear-waves) move through solids but not liquids.S-waves (also called shear-waves) move through liquids but not solids.S-waves (also called shear-waves) move through both solids and liquids.
S-waves, also known as shear waves, flow through liquids but not solids, which is correct information regarding seismic waves travelling through the earth.
What are seismic waves?Seismic waves are created when materials unexpectedly move inside the Earth, such as when they slide down a fault when in an earthquake.. Seismic waves can also be produced by volcanic eruptions, explosions, landslide, avalanches, or even swiftly flowing rivers. An acoustic wave that passes through the Planet or the other planetary body is called a seismic wave. Large landslides, volcanic eruptions, magma movement, earthquakes, and man-made explosions that release a lot of low-frequency acoustic energy can all cause it.
What causes seismic?Sudden movement along Earth's fault lines causes earthquakes. The motion releases "elastic strain" energy that has been accumulated inside the form of seismic waves, that travel through the Earth & cause the earth to tremble. Seismic wave research is crucial for understanding and forecasting earthquakes and tsunamis, but it also provides details on the structure and properties of the Earth, much like it did for the discovery the Mohorovicic's discontinuity.
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which of the following are considered alternative sources of energy? (select three) a. wind power b. gas power c. nuclear power d. geothermal power e. coal-based power
When nuclear reactions are used to generate energy, this is known as nuclear power. Currently, nuclear power plants use uranium and plutonium fission to generate the great majority of the world's electricity from this source.
What is the issue with nuclear energy?The creation of radioactive wastes such spent (spent) enriched uranium, uranium mill tailings, and other nuclear waste is a substantial environmental risk connected to nuclear power. These materials could stay radioactive and dangerous to human health for millions of years.
How do you refer to nuclear energy?The energy released in large quantities during activities that have an impact on atomic nuclei, or the dense centers of atoms, is known as nuclear energy, also known as atomic energy.
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which of the three kicks in the figure is in the air for the longest time ? they all reach the same maximum height
The vertical motion of balls determines time of flight. Since everyone reaches the same altitude, their time in the air will be equal. Everyone will fly at the same moment.
By focusing just on the ball's vertical motion and ignoring air resistance, the length of time it takes to reach the highest point may be calculated. The formula y(t) = h + v0t - (1/2)gt2 may be used to calculate the vertical motion of a projectile, where h is the greatest height, v0 is the beginning velocity, t is the duration, and g is the acceleration caused by gravity. Set y(t) = h and solve for t to determine the time needed to achieve the maximum height. The time it takes the ball to reach its highest point when air resistance is neglected is given by this equation: t = sqrt(2h/g).
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which of the three kicks in the figure is in the air for the longest time? they all reach the same maximum height h. ignore air resistance.
in the bohr theory of the hydrogen atom, an elec-tron moves in a circular orbit about a proton, where the radius of the orbit is 5.29 3 10211 m. (a) find the magni-tude of the electric force exerted on each particle. (b) if this force causes the centripetal acceleration of the electron, what is the speed of the electron?
The magnitude of the electric force exerted on each particle is F=[tex]8.22 \times 10^{-8}[/tex] N and the the speed of the electron is v = [tex]2.19\times 10^{6}\: m/s[/tex]
The nucleus and electrons are drawn to one another by the electric force. The void created by a positive or negative charge is referred to as an electric field since it generates a field there. If you had a positive charge just here, it would have an electric field surrounding it and affect the area in which it was located. The same applies for a negative charge; it too has an electric field surrounding it. Now, opposite charges attract each other while like charges repel one another. A positive charge here and a positive charge here, for example, would resist one another since they are similar charges.
a) - F=[tex]K_e\frac{e^2}{r}[/tex]'
F=[tex](8.99\times10^9Nm^2/C^2)\frac{(1.60\times10^{-19})^{2} }{(0.529\times10^{-10} )^2}[/tex]
F=[tex]8.22 \times 10^{-8}[/tex] N
b)- [tex]v=\sqrt\frac{Fr}{m}[/tex]
[tex]v=\sqrt\frac{8.22\times 10^{-8}\times0.529\times 10^{-10}}{9.11\times 10^{-31}}[/tex]
v = [tex]2.19\times 10^{6}\: m/s[/tex]
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what is the correct ac power priority for ac bus 2? assume all power sources are available to the electrical system.
The correct AC power priority for AC bus 2 is: Utility power, Emergency power, Standby power, Uninterruptible Power Supply (UPS) and Generator power.
The AC power is not paralleled. An existing source of AC power is immediately disconnected in favour of the source that is currently connected to a generator bus. No source of AC power automatically enters the system (when it reaches proper voltage & frequently). It needs to be manually turned on. NB The "automatic generator on-line" feature on the NG has loosened this rule. If the APU fails or is turned off after takeoff while still powering the buses, this will automatically connect the engine generators.
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please help me! Fill in all the blanks using the highlighted words. All 23 please. Thank you!!
Blood travels throughout the body as follows:
oxygen inhale red blood cellsblood vena cavaright atriumright ventriclelungs pulmonary deoxygenated lungs Gas exchangecapillaries oxygenated pulmonaryleft oxygenated heart left atrium ventricle aortaupper lowerHow does circulation work?Circulation is the continuous movement of blood throughout the body by the circulatory system. It consists of the heart, blood vessels (arteries, veins, and capillaries), and blood. The heart acts as a pump, sending oxygen-rich blood through the arteries to the body's cells, and then returning oxygen-depleted blood through the veins back to the heart.
The exchange of oxygen, nutrients, and waste products between the blood and cells occurs through the capillaries. This continuous flow of blood helps to maintain the body's functions and overall health.
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choose the correct definition of precession, and the correct explanation how does it affect what we see in our sky?
Precession is the slow and continuous change in the orientation of the rotational axis of a spinning body, such as a spinning top or the Earth.
When compared to its orbital plane around the sun, the Earth's rotational axis tilts at an inclination of about 23.5 degrees.
The Earth's rotational axis travels in a round pattern in space as a result of precession; one full cycle takes about 26,000 years to complete. The celestial poles, which are the spots in the sky where the Earth's rotational axis crosses the celestial sphere, are impacted by this movement of the rotational axis.
The Earth's spinning axis points in a different direction over time as a result of precession, which affects the position of the celestial poles. The position of the stars as seen from Earth is then impacted by this.
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Why more physicists are starting to think space and time are ‘illusions’ ?
Some physicists are starting to question the traditional view of space and time as fundamental and unchanging entities because of the strange and counterintuitive behaviour of the universe at very small scales, as described by quantum mechanics.
What does quantum physics suggest?It suggests that the concepts of definite position and definite momentum cannot both be precisely known at the same time and that the position and velocity of particles are inherently uncertain.
What does general relativity theory predict?General relativity predicts that spacetime itself can be affected by matter and energy and that it can bend, stretch, and curve.
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a motor operates an endless conveyor belt. the motor produces a force of 500.0 n on the belt and it moves at the rate of 6.5 m/s. what is the power of the motor in kilowatts?
The power of the motor in kilowatts is 3.25 kW.
What does the kW of a motor mean?The maximum output of an electric motor is referred to as "power" and is a fairly straightforward concept. This is rated in kilowatts (or 1000 watts), like a standard internal combustion engine (ICE). You'll get more power at the cost of higher energy use if you have more kW.
Since work is defined as force times displacement ([tex]W=F\times d[/tex]) and velocity is defined as force times displacement over time (v=d/t), power is equal to force times velocity.
Multiply the motor voltage by the full-load current. Watts stand in for the result. Watts are converted to kilowatts by multiplying by 1000. For instance, 4,600 watts is equal to 230 volts times 20 amps.
Given,
Motor produce force = 500.0N
moves at the rate = 6.5 m/s
Power = Force × Velocity
Power = 500 × 6.5
Power = 3250 watts
= 3.25 kW
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a planar surface of area a with a unit normal vector sits in an uniform electric field . the electric flux through the surface is:
The highest flux would be reached if the planar surface was perpendicular to the electric field vector.
What is electric flux through planar surface?The electric flux through a planar area is defined as the electric field multiplied by the area component perpendicular to the field. If the area is not planar, the flux must be evaluated using an area integral because the angle is constantly changing.
The electric flux (E) travelling through a surface of vector area S is: E = ES = EScos, where E is the magnitude of the electric field (in units of V/m), S is the area of the surface, and is the angle between the electric field lines and the normal (perpendicular) to S.
To know more about The electric flux (E) travelling through a surface of vector area S is: E = ES = EScos, where E is the magnitude of the electric field (in units of V/m), S is the area of the surface, and is the angle between the electric field lines and the normal (perpendicular) to S.
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3. The city of Oslo, Norway, has an average daytime temperature of -3.7°C in January. The city of Bergen, Norway, has an average daytime temperature of 1.5°C. Both cities are at about the same latitude. One city is on the Norwegian coast; the other is inland. A mountain is between them. Which city do you think is on the coast? Why? What effect do you think the mountain has on the temperature of the inland city
The city of Bergen, Norway ( hotter among them) is on the coast because warm wind from sea helps to remain warmer whereas the cold air from the mountain makes the temperature of the other city lower.
What is temperature?Temperature is a temperature of hotness or coolness that can be described in terms of a variety of arbitrary scales. It also indicates the direction in which heat energy would spontaneously flow, i.e., from a hotter (body) to a colder (body) body (one at a lower temperature).
Temperature is not the same as the energy of a thermodynamic system; for instance, an iceberg has a significantly larger total heat energy than a match.
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if a bird flies 30 degrees north of east at 20 m/s relative to the air, and if there is a wind towards the south at 10 m/s relative to the ground, what is the bird's speed relative to the ground in m/s?
The required speed of the bird relative to the ground is calculated to be 11.18 m/s.
The speed of the bird relative to air is given as 20 m/s.
The speed of air with respect to the ground is given as 10 m/s.
The speed of the bird relative to the ground in m/s is to be calculated.
The angle at which the bird flies is 30° north of east.
The equation of velocity of the bird relative to the ground can be written as,
V bg = V ba + V ag
where,
V bg is the velocity of bird with respect to ground
V ba is the velocity of the bird with respect to air
V ag is the velocity of air with respect to ground
Putting the values into the above equation, we have,
V bg = V ba + V ag = 20 sin30° i + 10 sin30° j = 20 × 1/2 i + 10 × 1/2 j = 10 i + 5 j
The magnitude of the velocity of bird with respect to ground is,
V bg = √(10² + 5²) = √(100 + 25) = √125 = 11.18 m/s
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