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A skateboarder starts from the side of a circular ramp of radius r = 4 meter and travels downward. He would like to have the normal force on him be five times as large as his weight at the bottom of the ramp.
(a) Draw a free body diagram for the skateboarder at the bottom of the ramp. Your arrows must be the correct length.
(b) Determine how fast must he be going at the top of the ramp therefore that the normal force is five times his weight at the bottom?
If a car travelling at 52 km/h will skid 18 m when its brakes lock, how far-off will it skid if it is travelling at 120 km/h when its brakes lock.
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A person of mass 71.5 kg is initially atrest on the edge of a large stationary platform ofmass 160 kg, supported by frictionless wheels on a horizontal surface.
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