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A roller coaster has a vertical drop of 68.6m. The speed at the end of the drop is 35.6 m/s. The car is at rest at the end of the drop. What percent of the initial mechanical energy is dissipated by friction?
A man applies a force of F = 3.00 102 N at an angle of 60.0° to a door, x = 1.90 m from the hinges. Find the torque on the door
given that the speed of sound in the air is 343 ms and that human ears are typically 20 cm apart what is the maximum
A spherical conductor with radius 2.00 cm is centered on the origin and holds charge q1=-250 nC, Find the surface charge density a(charge per area) on the outside surface of the outer spherical shell
A 1120 kg four door sedan hits a 1420 kg minivan that is at rest. The two cars lock together and skid 12.0 m on a level surface before stopping. what is the frictional force acting on the two cars
A disk-shaped merry-go-round of radius 2.63 m and mass 155 kg rotates freely with an angular speed of 0.763 rev/s, Calculate the initial and final kinetic energies for this system.
The average speed of a nitrogen molecule in air is about 6.70 ? 102 m/s, and its mass is about 4.68 ? 10-26 kg, What average force does the molecule exert on the wall
A ?ywheel in the form of a heavy circular disk of diame
q1. helium he a monatomic gas fills a 0.009 m3 container. the pressure of the gas is 6.00 105 pa. how long would a 0.25
A block of mass 2.0 kg rests on a horizontal surface. The coefficient of static friction between the block and the surface is 0.30. What is the static frictional force
assume a block of mass 25.0 kg rests on a horizontal plane, and the coefficient of static friction between the surfaces is 0.220. what is the actual static frictional force that acts on the block if an external force of 25.0 N acts horizontally on..
A 20-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 35 N. Starting from rest, the sled attains a speed of 2.6 m/s in 9.1 m. Find the coefficient of kinetic friction between the runners of the sled and the sn..
Imagine that you are standing at the top of a cliff 45 m high overlooking the ocean and you throw a rock straight downward at a speed of 15m/s
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