A ball is thrown toward a building 50 ft distant at a speed of 100 ft/sec. At what angle must it be thrown if it is to pass through a window 42 ft from the ground?
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A ball is thrown toward a building 50 ft distant at a speed of 100 ft/sec.
At what angle must it be thrown if it is to pass through a window 42 ft from the
ground?
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- An athlete crosses a 29 m wide river by swimming perpendicular to the water current at a speed of 1.1 m/s relative to the water. He reaches the opposite side at a distance 45 m downstream from his starting point. w = 29 md = 45 mvs = 1.1 m/s Part (a) How fast is the water in the river flowing with respect to the ground in m/s? Part (b) What is the speed of the swimmer with respect to a friend at rest on the ground in m/s?A large cruise ship has a bowling alley straight down the center of the ship, parallel to the sides. If a ball is bowled straight down the center of the alley, explain why the ball might appear to speed up or slow downBob has just finished climbing a sheer cliff above a level beach and wants to figure out how high he climbed. All he has to use is a baseball, a stopwatch, and a friend on the ground below with a long measuring tape. Bob is a pitcher and knows that the fastest he can throw the ball is about vo = 33.7 m/s. Bob starts the stopwatch as he throws the ball, with no way to measure the ball's initial trajectory, and watches carefully. The ball rises and then falls, and after t₁ = 0.710 s the ball is once again level with Bob. Bob cannot see well enough to time when the ball hits the ground. Bob's friend then measures that the ball hit the ground x = 123 m from the base of the cliff. How high above the beach was the ball when it was thrown? initial height: X 1₁ m
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