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A skateboarder (m = 92 kg) takes a running jump onto a friend's skateboard that is initially at rest as sketched in the figure below. The friend is standing on the skateboard (mass of friend plus skateboard = 114 kg). After landing on the skateboard, the velocity of the board plus the two skateboarders is 2.8 m/s. What was the horizontal component of the velocity of the jumping skateboarder just before he landed on the skateboard?
question1an unpolarized beam of light is sent into a stack of four polarizing sheets oriented so that the angle between
A 175-g object is attached to a spring that has a force constant of 72.5 N/m, Find the locations of the object when its velocity is one-third of the maximum speed
An astronaut travels at a speed of 0.93c from the Earth to a distant star that is 4.5e+17 m away. how old is she when she arrives at the star
The electric field everywhere on the surface of a charged sphere of radius 0.170 m has a magnitude of 590 N/C, What is the net charge on the sphere
Consider two parallel wires placed 0.0430 m apart. One wire carries a current of 6.16 A and the other wire carries a current of 7.88 A. Find the force per length
A 0.50 kg mass is attached to a spring of spring constant 20 N/m along a horizontal, frictionless surface. Find the potential energy stored in the spring when the mass is at its maximum displacement
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A small sphere with mass 1.20 hangs by a thread between two large parallel vertical plates 5apart. The plates are insulating and have uniform surface charge densities and. The charge on the sphere is = 8.80×10-6.
A 40-g bullet leaves the muzzle of a gun at a speed of 300 m/s. If the barrel of the gun is 12 cm long, what is the force acting on the bullet while it is in the barrel.
Precisely 1.10 after the speeder passes, the policeman steps on the accelerator. If the police car's acceleration is 2.10 m/s2, Explain how much time elapses after the police car is passed until it overtakes the speeder
Brian is trying to pull Julie on a sled across a flat snowy field. Brian puls on a rope attached to the sled. how much force must Brian exert on the rope to start moving the sled
An x-ray tube accelerates electrons from rest at 5.0×10 14th m/s(squared) power through a distance of 20cm . (Such high accelerations are possible because electrons are extremely light.) Find the electrons'velocity after this acceleration. Find th..
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