kid slides down to four frictionless slides a to d, all having the same height. Rank in order, from la mallest, his speeds va to va at the bottom. α b d 20
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- A bottle rocket is shot straight up in the air with a speed 30 m/s. if the air resistance is ignores, the bottle would go up to a height of approximately 46 m. however the rocket goes up to only 35 m before returning to the ground. What happened? Explain, giving only a qualitative response.A bowling ball is dropped from the top of a building that has a height of h = 104 m. a. Assuming air resistance is negligible, what is the ball's speed, vf in m/s, when it strikes the ground? b. If drag produces an opposing force of 10 N while the ball's falling, what is the ball's speed, vf in m/s, when it strikes the ground? Assume the ball has a mass of 5 kg. c. A different ball was dropped and the final speed was measured to be vf = 8.5 m/s while the drag force was measured to be 50 Newtons. What is the mass of this ball in kg?A 62 kg trampoline artist jumps upward from the top of a platform with a vertical speed of 4.5 m/s. How fast is he going as he lands on the trampoline, 2 m below?
- Sarah and her bicycle have a total mass of 40 kg. Her speed at the top of a 10 m high and 100 m long hill is 5 m/s. If the force of friction on her way down is 20 N, at what speed will she be going when she reaches the bottom? 5 m/s 10 m/s 11 m/s She stops before she reaches the bottomTarzan grabs a vine hanging vertically from a tall tree when he is running at 9.0m/s.. (a) How high can he swing upward? (b) Does the length of the vine affect this height?A coin is tossed straight upward into the air so that it reaches a maximum height of 25.0 m after 5s (neglect air friction ). A) what is its initial speed? B) what’s it’s acceleration ? C) what’s it’s velocity and acceleration when it reaches maximum height ??
- Given: A bowling ball is dropped from the top of a building that has a height of h = 101 m. Assuming air resistance is negligible, what is the ball's speed, vf in m/s, when it strikes the ground? If drag produces an opposing force of 10 N while the ball's falling, what is the ball's speed, vf in m/s, when it strikes the ground? Assume the ball has a mass of 5 kg. A different ball was dropped and the final speed was measured to be vf = 6.5 m/s while the drag force was measured to be 50 Newtons. What is the mass of this ball in kg?A 60 kg skier starts from rest at height H = 20 m abovethe end of a ski-jump ramp and leaves the ramp at angleu = 28. Neglect the effects of air resistance and assume the rampis frictionless. (a) What is the maximum height h of his jump abovethe end of the ramp? (b) If he increased his weight by putting on abackpack, would h then be greater, less, or the same?A car coast down a hill and then up a smaller one onto a level surface, where it has a speed of 32 ft/s. If the car started 200 ft above the lowest point on the track, how far above this lowest point is the level surface? Ignore friction. The correct answer is 184 ft.
- A man in a sled, with a total mass of 125 kg, slide down a grassy hill and reaches a speed of 8 m/s at the bottom. If a pile of grass can exert a constant force of 250 Newtons, how fast will the sled stop?A rescue diver of mass 84 kg jumps from a hovering helicopter into the ocean 34 meters below. What is the diver's speed (in m/s) when he hits the water?Q4 In the figure, a 3.9 kg block slides along a track from one level to a higher level after passing through an intermediate valley. The track is frictionless until the block reaches the higher level. There a frictional force stops the block in a distance d. The block's initial speed is v0 = 5.8 m/s, the height difference is h = 1.1 m, and μk = 0.632. Find d.