The statement "Sunspots are brighter than the rest of the sun's surface" is false.
What is magnet?Magnetism is a physical quality mediated by a magnetic field that refers to the ability to create attracted and repulsive occurrences in other substances. Magnetism is the force that magnets exert when they attract or repel one another. The movement of electric charges causes magnetism. Every material is composed of microscopic components known as atoms. Each atom contains electrons, which are charged particles. Magnetism is caused by attraction when two items are brought together or repulsion when two objects are moved apart. A magnet is an item with magnetic qualities. A magnet, for example, may attract another thing.
Here,
Sunspots are really darker than the surrounding photosphere, and thus appear as black spots on the sun's surface. This is because large magnetic fields are concentrated in these areas, inhibiting convection and cooling the surface.
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Did Earth's inner core stop spinning? Is it true that new study finds Earth may soon spin in reverse?
Answer:
Earth's inner core may have stopped turning and could go into reverse, study suggests. The rotation of Earth's inner core may have paused and it could even go into reverse, new research suggests. The Earth is formed of the crust, the mantle and the inner and outer cores.
Explanation:
how long is the flea in the air from the time it jumps to the time it hits the ground? express your answer in seconds to three significant figures.
The time a flea spends in the air from the time it jumps to the time it hits the ground depends on the initial velocity of the jump and the acceleration due to gravity.
To calculate the time, we need to know the initial velocity and the height the flea jumps. Without this information, it is not possible to determine the time the flea spends in the air.
You will use kinematic equations to analyze a jumping flea in this problem. Assume that the free-fall acceleration is 9.80.
In standard athletics, the running leap and standing jump have an initial velocity of 9.15 and 2.70 m/s and an initial angle of jump of 21 and 38 degrees, respectively. Maximal beginning velocity strength, angle of engaged force, and height are all strongly correlated with the maximum horizontal velocity of 9.15 m/s.
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A machine uses a force of 200 newtons to do 20000 joules of work in 20 seconds. Find the distance the object moved and the power of the machine.(Hint: A joule is the same as a newton-meter)
suppose a ball is thrown straight up and experiences no appreciable air resistance. what is its horizontal acceleration just before it reaches its highest point?
The horizontal acceleration of a ball thrown straight up just before it reaches its highest point is zero. As the ball is thrown vertically upward, its only acceleration is due to gravity, which acts in the downward direction. There is no force acting horizontally, so the horizontal acceleration is zero.
When a ball is thrown straight up, it experiences a gravitational force pulling it down. This results in a vertical acceleration of the ball towards the ground. However, at the highest point of its trajectory, the ball has stopped rising and has not yet started to fall. At this moment, there is no horizontal component of velocity and thus no horizontal acceleration. The ball is only being affected by gravity, which acts vertically, so the horizontal acceleration is zero. This means that the ball does not change its horizontal position or speed as it reaches its highest point.
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Rock A is thrown horizontally off of a cliff with a velocity of 20 m/s. The rock lands 60 m from the base of the cliff. Om/s? V=20 m/s 3 m/s? 9.8 m/s? 20 m/s? 60 m CLEAR ALL According to the information and diagram shown above, what is the magnitude of the vertical acceleration for Rock A after it is released?
After being released, Rock A experiences a vertical acceleration of 9.8 m/s2. The acceleration brought on by gravity, which is constant for all objects close to the Earth's surface.
What is called velocity?The vectorial representation of a particle or object's motion with respect to time is called velocity. The metre per second (m/s), usually referred to as speed, is the accepted unit of velocity magnitude. As an alternative, the velocity magnitude can be expressed in centimetres per second (cm/s). Simply said, velocity is the rate of motion of an object in a specific direction. Using an automobile driving north on a highway as an example, or a rocket after it has launched, as an example of speed.
Why is velocity a vector?Speed is a scalar quantity because it just has magnitude and no direction. A vector is necessary to "carry" something from point A to point B; the Latin root of the word vector denotes "carrier". The first to use it were astronomers in the 18th century who were researching planetary rotation around the Sun.
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prior to starting the engine, which test should be made of the electric gyroscopic instruments prior to ifr flight?
Before starting the engine, a pre-flight functional check should be performed on the electric gyroscopic instruments prior to an IFR flight.
The electric gyroscopic instruments should undergo a pre-flight functional check before the engine is started for an IFR (Instrument Flight Rules) flight. The following steps should be included in this check:
Check the power supply: Make that the instruments are powered by the appropriate, functional source.
Verify the display on each instrument to make sure it is operating properly and producing a visible and legible display.
Check the movements of the indicators: Look at each indicator's movement to make sure it is correct and fluid.
Verify electrical systems: Verify that the electrical systems connected to each instrument are in good working order and don't exhibit any symptoms of wear or damage.
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A circuit with 0.7 A running through the battery and two 16 Ω resistors in parallel. What is the voltage of the battery?
Answer:
Below
Explanation:
The two PARALLEL resistors equal: 1 / (1/16 + 1/16) = 8 Ω
V = IR = .7 (8) = 5.6 v
What will happen if the positive and negative connections on the voltmeter are reversed?
If the applied voltage is polarised in the opposite direction (negative on red and positive on black), the metre will display "backwards."
What happens when polarity reverses?Some devices may be electrically charged at all times if an outlet has reverse polarity. Electricity will flow to the switch in a properly connected outlet; with reversed polarity, it will be present in the item even when it is not switched on.Reverse polarity protection is an internal circuit that ensures the device is not destroyed if the polarity of the power source is reversed. The reverse polarity protection circuit disables power to the transmitter or transducer's sensitive electronic circuitry.If you reside in a house that has had amateur electrical work done, there's a strong chance you have some outlets with reversed polarity. That essentially means that some of your channels may surprise you. Uh oh! While not all shocks are lethal, they are all painful and unpleasant. Only a qualified electrical contractor in North Scottsdale, AZ can perform electrical repairs in your home.
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In the Northern Hemisphere, it is colder in the winter than in the summer because ________.
A. the Sun shines down at more of an angle during the winter
B. the Sun is closer to Earth during the winter
C. the Sun shines down more directly during the winter
D. the Sun is farther from Earth during the winter
near the end of a marathon race, the first two runners are separated by a distance of 65.0 m . the front runner has a velocity of 3.25 m/s , and the second runner has a velocity of 4.75 m/s . what is the magnitude of the velocity of the second runner relative to the first?
The magnitude of the velocity of the second runner relative to the first is 1.50 m/s
The velocity of the second runner relative to the first runner can be found using the following formula:
v_rel = v_2 - v_1
Where v_rel is the relative velocity, v_2 is the velocity of the second runner (4.75 m/s), and v_1 is the velocity of the first runner (3.25 m/s). Plugging in the values, we get:
v_rel = 4.75 m/s - 3.25 m/s = 1.50 m/s
The magnitude of the velocity of the second runner relative to the first is the absolute value of v_rel:
|v_rel| = |1.50 m/s| = 1.50 m/s
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The force of attraction between two objects is called gravity. (True or False)
It is true that the force of attraction between two objects is called gravity. Gravity is the force that attracts two objects towards each other, and it is proportional to the mass of the objects and the distance between them.
On what does the strength of the gravitational force depends?The strength of the gravitational force depends on the masses of the objects and their separation, and it is described by Newton's law of gravitation.
What does Newton's law of gravitation state?According to Newton's law of gravitation, the gravitational force between two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them.
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which would you measure in kilograms? (1 point) the mass of a butterfly, the capacity of a bottle, the mass of a basketball, the length of a river
why do we need to be careful about work done on the system versus work done by the system in calculations?
We have to be careful about work done by system and work done on system because they are completely different in nature.
In physics, work is said to be done on a system when force is applied to it and the system suffers displacement. Work is considered to be done by a system when it applies a force to something else and produces displacement.
Work done on the system indicates that anything outside the system (other than heat flow into the system) accomplished something to enhance the internal energy of the system. Because the system worked on anything outside the system, the system's internal energy diminished.
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a physics student places an object 6.0 cm from a converging lens of focal length 9.0 cm. what is the magnitude of the magnification of the image produced?
The magnitude of the magnification of the image produced is 3.0 cm.
In optics, magnification refers to the image's size in relation to the item that produced it. The ratio of the image length to the object length, as measured in planes perpendicular to the optical axis, is referred to as linear magnification, also known as lateral or transverse magnification. An inverted image is shown by a linear magnification value that is negative. The size-increasing factor, as determined along the optical axis, is known as longitudinal magnification. When measured from a specific point in the instrument, as is the case with magnifiers and binoculars, angular magnification is equal to the ratio of the tangents of the angles subtended by an object and its image.
[tex]\frac{1}{f}=\frac{1}{v}+\frac{1}{u}[/tex]
[tex]\frac{1}{9.0cm}=\frac{1}{v}+\frac{1}{6.0}[/tex]
[tex]\frac{1}{v}=\frac{1}{9}-\frac{1}{6}[/tex]
v=-18.0 cm
[tex]M=\frac{-v}{u}[/tex]
[tex]M=\frac{-18}{6}[/tex]
M=3.0 cm
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a football is kicked from ground level at a speed of 28 m/s m / s . if it reaches a maximum height of 26 m m , at what angle was it kicked (relative to horizontal)?
The football was kicked at an angle of approximately 8.2 degrees relative to the horizontal.
The problem can be solved using kinematic equations of motion and conservation of energy. The initial vertical velocity component of the football can be calculated from the initial velocity, maximum height, and time of flight, which can be calculated from the vertical motion of the football.
The initial vertical velocity component, v0y, can be calculated as follows:
v0y = v0sinθ
where v0 is the initial velocity and θ is the angle at which the football was kicked. The maximum height, h, is related to the initial vertical velocity and the acceleration due to gravity, g, by the following equation:
h = v0ysinθ * t - 1/2 * g * t^2
Rearranging and substituting the values:
sinθ = (h + 1/2 * g * t^2) / (v0 * t)
where t is the time of flight and can be calculated as:
t = (2 * v0sinθ) / g
So,
t = (2 * 28 * sinθ) / 9.8
And the maximum height is:
h = 28sinθ * t - 1/2 * 9.8 * t^2
Substituting the given values:
26 = 28sinθ * (2 * 28 * sinθ) / 9.8 - 1/2 * 9.8 * (2 * 28 * sinθ)^2 / 9.8^2
Solving for sinθ:
sinθ = sqrt(520 / 506) = sqrt(13 / 127)
So,
θ = sin^-1(sqrt(13 / 127)) = approximately 8.2 degrees
Thus, the football was kicked at an angle of approximately 8.2 degrees relative to the horizontal.
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two resistors can be either connected to a battery in series or in parallel. in which case, if either, is the equivalent resistance the smallest?
In a circuit with two resistors, the equivalent resistance is smallest when the resistors are connected in parallel.
In a parallel circuit, the total resistance is smaller than the smallest individual resistor because the current is divided among the resistors. Each resistor in the circuit has its own current, and the total current is equal to the sum of the individual currents. This means that the total resistance in a parallel circuit is less than the smallest individual resistor, since the current flowing through each resistor adds up to the total current.
In a series circuit, the total resistance is equal to the sum of the individual resistors, so the total resistance is greater than the smallest individual resistor. This is because in a series circuit, the current flows through each resistor one after the other, so the total resistance is the sum of the resistances of each resistor.
Therefore, the equivalent resistance is smallest in a parallel circuit.
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Which liquid has a specific heat capacity of 1000 J/kg degrees Celsius?
Paraffin has a specific heat capacity of 1000 J/kg degrees Celsius.
What is specific heat capacity?The massic heat capacity, also known as the specific heat capacity or symbol c in thermodynamics, is the quotient of the heat capacity of a sample of a substance and its mass.
Informally, it is the quantity of heat needed to raise a substance's temperature by one degree for every unit of mass that is added to it.
SI unit of specific heat capacity is J-kg⁻¹-K⁻¹.
The specific heat capacity of paraffin is about 1000 J/kg degrees Celsius. Hence, paraffin is the liquid.
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a 1.0-cm-diameter pipe widens to 2.0 cm, then narrows to 5.0 mm. liquid flows through the first segment at a speed of 4.0 m/s. what is the speed in the second and third segments?
The speed of the liquid in the second segment is V2 = 2.8284 m/s and The speed of the liquid in the third segment is V3 = 14.1421 m/s.
What is speed?
The velocity (commonly denoted as v) of an object is the amount of change in its position over time, or the amount of change in its position per unit time. it is therefore a scalar quantity. The average speed of an object over a period of time is the distance traveled by the object divided by the duration of the interval; The instantaneous speed is the limit of the average speed when the duration of the time interval approaches zero. Speed is not the same as speed.
The speed of the liquid in the second segment is calculated as follows:
V2 = V1 * (A1/A2)^0.5
V2 = 4.0 m/s * (pi * 0.01^2 / pi * 0.02^2)^0.5
V2 = 2.8284 m/s
The speed of the liquid in the third segment is calculated as follows:
V3 = V2 * (A2/A3)^0.5
V3 = 2.8284 m/s * (pi * 0.02^2 / pi * 0.005^2)^0.5
V3 = 14.1421 m/s.
The SI unit of speed is meters per second (m/s), but the most common everyday unit of speed is kilometers per hour (km/h) or miles per hour (mph) in the US and UK. .For air and sea travel, the knot is widely used.
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(a) a runner starts from rest and in 2 s reaches a speed of 9 m/s. if we assume that the speed changed at a constant rate (constant net force), what was the average speed during this 2 s interval? average speed
The average speed of an object during a time interval can be found by dividing the total distance traveled by the time interval. So the average speed during the 2 s interval was 4.5 m/s.
If the speed changed at a constant rate during the interval, then we can use the average speed as an approximation for the speed at the midpoint of the interval.
In this case, the runner started from rest and reached a speed of 9 m/s in 2 s, so the average speed would be half of the final speed:
average speed = (0 + 9 m/s) / 2
= 4.5 m/s
So the average speed during the 2 s interval was 4.5 m/s.
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An indicator that orients you when describing a motion is called the_____
A. time
B. Speed
C. reference point
D. point of motion
An indicator that orients you when defining a motion is called the reference point. The reference point provides a fixed frame of reference for observing and describing the position, velocity, and acceleration of an object.
How can you explain the use of reference point?If you are describing the motion of a car on a highway, you can use the side of the road or a specific landmark as the reference point. By using a reference point, you can determine the position, velocity, and acceleration of the car.
How can you determine an object is in motion?An object is considered to be in motion if its position changes relative to a reference point over time. There are several ways to determine if an object is in motion like Observing its position, measuring its velocity and observing its acceleration.
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can anyone please help with this? its algebra and measuring
when air resistance is neglected, why does the vertical component of velocity for a projectile change with time, whereas the horizontal component of velocity doesn't change?
Only the vertically component of the a projectile varies over time because gravity only affects objects vertically.
Why does a projectile's vertical component of velocity change?Gravitational force occurs vertically downward during projectile velocity. Other forces in either the horizontal or vertical axes have no effect on the missile. As a result, the gravitational force has an impact on the vertical motion. The projectile's momentum is accelerated by this force.
If there's no air resistance, what will happen?If there's no air pressure, the only force acting on an object once you let go of it is gravity. The relationship between the gravitational force and an object's mass. The gravitational pull is stronger for heavier items.
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if the electric field is 108 n/c at a distance of 59 cm from a point charge q, what is the value of q (in c)? (enter the magnitude.)
If the electric field is 108 n/c at a distance of 59 cm from a point charge q, the charge on the point charge is 9.98 x [tex]10^{-19}[/tex] Coulombs.
We can use the equation for the electric field produced by a point charge to find the charge:
E = k * q / [tex]r^{2}[/tex]
where,
E = the electric field, equal to 108 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
r = the distance from the point charge, equal to 59 cm = 0.59 m
Rearranging the equation to solve for q, we get:
q = E * [tex]r^{2}[/tex] / k
Plugging in the values, we get:
q = 108 N/C * [tex](0.59 m)^{2}[/tex] / 8.99 x [tex]10^{9}[/tex] N [tex]m^{2}[/tex] / [tex]C^{2}[/tex] )
q = 9.98 x [tex]10^{-19}[/tex] C
So the charge on the point charge is 9.98 x [tex]10^{-19}[/tex] C, or 9.98 x [tex]10^{-19}[/tex] Coulombs.
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what is a general rule relating the directions of the applied force, friction force and direction of motion?
According to the general laws, the direction of friction is always the opposite of the direction of motion, parallel to the surface between objects, and perpendicular to the normal force.
According to general laws, the force of friction acts on moving objects in the opposite direction of motion. Frictional force always operates in the opposite direction of applied force.
The normal force is opposite of the object's surface, which implies that if the object is laying on the ground, the normal force will be opposite in direction of the surface on which the surface is lying, which in this case is the ground.
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how does a voltage in one coil result in a different voltage in a second coil in a microwave transformer?
Answer:
A changing current in the primary coil induces an e.m.f in the secondary. Since the e.m.f generated depends on the number of turns, the voltage induced in the secondary can be changed - stepped up or down - by altering the turn's ratio.
107) if the collision between the marble and the block is completely inelastic, what is the speed of the block after the collision? 0.476 m/s
When an elastic object collides with another object, the speed is unchanged. Accordingly, motion if indeed the collision is elastic, the particles' final speed will be 4.00 m/s.
How is a formula for speed determined?Speed is calculated as follows: speed = distance * time. Knowing the values for time and distance is necessary to calculate the units for speed. The measurements will be meters per second (m/s) in this example since the distance is measured in m. (m) and the time is measured in seconds (s).
The collision formula is what?Elastic Collision's momentum formula is m1u1 Plus m2u2 Equals m1v1 + m2v2. m(u1-v1) = m(v2-u2) (v2-u2) ⇢ (Algebra A) For elastic collisions, the kinetic formula is 1/2(m1u12) + 1/2(m2u22) Equals 1/2(m1v12) + 1/2. (m2v22).
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a model rocket accelerates upward from the ground with a constant acceleration, reaching a height of 52 m in 5 s. what is the speed (in m/s) at a height of 52 m?
The speed (in m/s) at a height of 52 m is v = 20.8 m/s.
It is given that, a model rocket accelerates upward from the ground with a constant acceleration, u = 0
Height reached, d = 52 m
Time taken, t = 5 s
Let a is the acceleration of the rocket. It can be calculated using second equation of motion as,
[tex]d = ut + \frac{1}{2} at^{2}[/tex]
[tex]a = \frac{2d}{t^{2} }[/tex]
[tex]a = \frac{2 * 52 }{5^{2} }[/tex]
a = 4.16 [tex]m / s^{2}[/tex]
Let v is the speed at the height of 50 meters. So,
[tex]v = u + at[/tex]
[tex]v = 4.16 * 5s[/tex]
v = 20.8 m/s
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the force of attraction between two or more objects
The offered statement claims that gravity is the gravitational pull amongst two or more things.
What in physics is a force?The essence of force in quantum mechanics is: The pull or pull on a massed object changes its velocity. An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.
What is the scientific definition of force?The term "force" has a specific meaning in science. At this level, calling a force a pushes or a yank is quite appropriate. A spirit is not a substance an item "has in it" or that it "contains." One thing experiences a force from another.
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an express train passes through a station. it enters with an initial velocity of 22.0 m/s and decelerates at a rate of 0.160 m/s2 as it goes through. the station is 205 m long. how long did the nose of the train stay in the station?
3.05s is taken for the nose of the train stay in the station which enters with an initial velocity of 22.0m/s and decelerates at a rate of 0.160 m/s^2 as it goes through the station is 205 m long.
Given the initial velocity of train (u) = 22m/s
The deceleration of train (a) = -0.160m/s^2
The length of station (Δd) = 205m
Time taken for the train to cross the station = t
From Newtons laws of motion, we know that Δd = ut + 1/2at^2
Then, 205 = 22 x t - 1/2 x 0.160 x t^2
22t - 0.08t^2 - 205 = 0
Then t = 3.05s
Hence the time required for nose of the train stay in the station is 3.05s.
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If the force was lifted from the mass and the object was going 10m/s, what would its momentum be?
Every objects moving with a velocity is associated with certain momentum. The momentum of the object with the mass m and velocity 10 m/s is 10 times its mass.
What is momentum ?
Momentum of an object is its ability to bring the applied force to make a maximum displacement. The force applied depends on the mass and acceleration of the body.
Similarly, momentum is the product of the mass and velocity of the moving body.
i.e., P = mv
An object at rest have no momentum.
If a body of mass say, m is moving with a velocity of 10 m/s, then the momentum of the body is:
p = 10 m/s ×m Kg = 10m kg m/s.
Therefore, the momentum of the body will be 10 times the mass of that body.
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