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Two ice skaters, with masses of 50.0kg and 75.0kg , are at the center of a 40.0m -diameter circular rink. The skaters push off against each other and glide to opposite edges of the rink. If the heavier skater reaches the edge in 40.0s , how long does the lighter skater take to reach the edge?
A stone is thrown straight up with a speed of 25.0 m/s from the top of a building 55.0 m tall. How far above the ground will the stone go
The objective of a certain lens system is a double convex lens of 10.2 cm focal length; how far is the image from the eyepiece
When a potential difference of 12 V is applied to a wire 6.2 m long and 0.24 mm in diameter the result is an electric current of 2.1 A. What is the resistivity of the wire
You can excite waves in a string of length 1.142 m fixed at both ends. You started from an arbitrarily low frequency and increased it slowly. What is the speed of the wave in the medium in m/s
A beam of 12 cm microwaves strikes a surface glass with an index of 1.5 at an incident angle of 45 degrees. Compute the transmitting angle
A ball rolls down a roof that makes an angle of 30 degrees to the horizontal. The ball has an initial speed of 5 m/s and the roof is 7 meters tall. how far from the base of the house does it land
A compressed-air cylinder stands 96.0 cm tall and has internal diameter 21.0cm cm . At room temperature, its pressure is 161 atm. How many moles of air are in the cylinder
You are at the controls of a particle accelerator, sending a beam of 2.70×107 protons (mass ) at a gas target of an unknown element. Your detector tells you that some protons bounce straight back after a collision with one of the nuclei of the unk..
An escalator joins one floor with another one 8.20 m above. The escalator is 13.3 m long and moves along its length at 62.0 cm/s. What power must its motor deliver
Two rocket ships travel in the same direction with a relative speed of .98c. a light pulse is fired from the back of one of the ships to the front of the same ship of length deltaX=20m.
The Earth has an electric field that points toward the center of the earth and that has a magnitude of 150 N/C. How much charge is needed for it to be suspended in the air
A 2.0 kg block is projected down a plane that makes an angle of 20.degree with the horizontal with an initial kinetic energy of 2.0 J. If the coefficient of kinetic friction between the block and plane is 0.40, how far will the block slide down along..
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