Leaping the River II. A physics professor did dare-devil stunts in his spare time. His last stunt was an attempt to jump across a river on a motorcycle ( Fig. P3.63 ). The takeoff ramp was inclined at 53.0°, the river was 40.0 m wide, and the far bank was 15.0 m lower than the top of the ramp. The river itself was 100 m below the ramp. Ignore air resistance, (a) What should his speed have been at the top of the ramp to have just made it to the edge of the far bank? (b) If his speed was only half the value found in part (a), where did he land? Figure P3.63
Leaping the River II. A physics professor did dare-devil stunts in his spare time. His last stunt was an attempt to jump across a river on a motorcycle ( Fig. P3.63 ). The takeoff ramp was inclined at 53.0°, the river was 40.0 m wide, and the far bank was 15.0 m lower than the top of the ramp. The river itself was 100 m below the ramp. Ignore air resistance, (a) What should his speed have been at the top of the ramp to have just made it to the edge of the far bank? (b) If his speed was only half the value found in part (a), where did he land? Figure P3.63
Leaping the River II. A physics professor did dare-devil stunts in his spare time. His last stunt was an attempt to jump across a river on a motorcycle (Fig. P3.63). The takeoff ramp was inclined at 53.0°, the river was 40.0 m wide, and the far bank was 15.0 m lower than the top of the ramp. The river itself was 100 m below the ramp. Ignore air resistance, (a) What should his speed have been at the top of the ramp to have just made it to the edge of the far bank? (b) If his speed was only half the value found in part (a), where did he land?
A playground is on the flat roof of a city school, 6.00 m abovethe street below (Fig. P3.19). The vertical wall of the buildingis h = 7.00 m high, to form a 1-m-high railing around the playground.A ball has fallen to the street below, and a passerbyreturns it by launching it at an angle of θ = 53.0° above thehorizontal at a point d = 24.0 m from the base of the buildingwall. The ball takes 2.20 s to reach a point vertically abovethe wall. (a) Find the speed at which the ball was launched.(b) Find the vertical distance by which the ball clears the wall.(c) Find the horizontal distance from the wall to the point onthe roof where the ball lands.
In 1999, Robbie Knievel was the first to jump the Grand Canyon on a motorcycle. At a narrow part of the canyon (65 m wide) and traveling 36.1 m/s off the takeoff ramp, he reached the other side. What was his launch angle?
A friend of yours has a one story house with a pool in the backyard. Someone gets the bright idea to jump from the roof of the house into the deep end of the pool. a) If the roof of the house is 16 ft tall and the horizontal distance between the edge of the house and the pool is 10 ft, what would the jumper's minimum velocity need to be to land in the pool?
b) Let's assume your friend can jump with an initial horizontal velocity of 15 ft/s. What is their total velocity when they hit the water? (hint: determine both the x and y velocity components, find the resultant)
Chapter 3 Solutions
University Physics with Modern Physics (14th Edition)
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