A roller coaster with passengers has a mass of 400 kg. At the top, the coaster is assumed to be at rest. Determine the minimum height, h, that it must start from in order to go around a 40 m diameter loop without falling off the track at the top of the loop. Take h to be the distance from the ground and the bottom of the loop is also at the ground level.

Astudent pushes on a 20.0 kg box with a force of 50 n at an angle of 30° below the horizontal. the box accelerates at a rate of 0.5 m/s2 across a horizontal floor. what is the value of the normal force on the box? 200 n 243 n 156 n 225 n

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When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great.d) about 10 times as great.