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An astronaut leaves Earth in a spaceship at a speed of 0.280C relative to Earth. If the destination is a star system 12.5 light-years away as measured by an observer on Earth, Find the distance to the star system as measured by the astronaut?
We did an experiment with newtons third law where we pushed two carts together and measured the force exerted with a computer. We did it with springs in between the carts first, which showed the force of the carts to be equal.
The headlights of a car are 1.6 m apart and produce light of wavelength 575 nm in vacuum. The pupil of the eye of the observer has a diameter of 4.0 mm and a refractive index of 1.4.
An engine of an aircraft propeller delievers an amount of power 171 hp to the propeller at the rotational velocity of 2360 rev/min, How much torque does the aircraft engine provide
a bullet of mass 0.024 kg is fired horizontally with a speed of 75 ms from a tall bridge. if the bullet is in the air
A mass M = 95.0 kg is suspended by a massless string from the ceiling of a van which is moving with constant acceleration a, what is the acceleration a of the van
find a horizontal force needed to pull a mass of 500 gram at constant velocity on a level surface and µk = 0.3?
A person who is 1.7 m tall throws a ball with a speed of 4 m/s atan angle of 31 degrees above the horizontal. What are the x and y components of the velocity (in m/s) of the ball the instant before it strikes the ground?
A telescope has an angular magnification of -30× and a barrel 1.02m long. What is the focal length of the eyepiece
On an essentially frictionless ice rink, a skater moves at 3 m/s. Find the length of the rough patch
a 5.0 -thick layer of oil n1.46 is sandwiched between a 1.5 -thick sheet of glass and a 2.3 -thick sheet of polystyrene
An airplane flying upward at 35.3 m/s and an angle of 30.0° relative to the horizontal releases a ball when it is 255 m above the ground. find the time of it takes the ball to hit the ground
a if a cylindrical wire with are a has a resistance r what would be its resistance when the area is doubled?b if a
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