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A student throws a heavy red ball horizontally from a balcony of a tall building with an initial speed v0. At the same time, a second student drops a lighter blue ball from the same balcony. Neglecting air resistance, which statement is true? (a) The blue ball reaches the ground first, (b) The balls reach the ground at the same instant, (c) The red ball reaches the ground first, (d) Both balls hit the ground with the same speed, (e) None of statements(a) through(d) is true.
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Chapter 3 Solutions
COLLEGE PHYSICS,V.2
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- A student throws a heavy red ball horizontally from a balcony of a tall building with an initial speed vi. At the same time, a second student drops a lighter blue ball from the balcony. Neglecting air resistance, which statement is true? (a) The blue ball reaches the ground first. (b) The balls reach the ground at the same instant. (c) The red ball reaches the ground first. (d) Both balls hit the ground with the same speed. (e) None of statements (a) through (d) is true.arrow_forwardA projectile is launched on the Earth with a certain initial velocity and moves without air resistance. Another projectile is launched with the same initial velocity on the Moon, where the acceleration due to gravity is one-sixth as large. How does the range of the projectile on the Moon compare with that of the projectile on the Earth? (a) It is one-sixth as large. (b) It is the same. (c) It is 6 times larger. (d) It is 6 times larger. (e) It is 36 times larger.arrow_forwardAn attacker at the base of a castle wall 3.95 m high throws a rock straight up with speed 8.20 m/s from a height of 1.50 m above the ground. (a) Will the rock reach the top of the wall? O Yes O No (b) If so, what is its speed at the top? If not, what initial speed must it have to reach the top? m/s (c) Find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 8.20 m/s and moving between the same two points. m/s (d) Does the change in speed of the downward-moving rock agree with the magnitude of the speed change of the rock moving upward between the same elevations? O Yes O No (e) Explain physically why it does or does not agree.arrow_forward
- You stand on the edge of a very tall building with three rocks, which you are going to throw off the edge. You throw the first rock straight outwards, the second rock at an angle 60° above the horizontal, and the third rock 30° below the horizontal. If you throw all three rocks with the same initial speed, which will be moving the fastest when it hits the ground? The first rock The second rock. They will all have the same speed. The third rockarrow_forwardA rock is thrown off a cliff at an angle of 54° above the horizontal. The cliff is 110 m high. The initial speed of the rock is 20 m/s. (Assume the height of the thrower is negligible.)arrow_forwardA ball is projected vertically up from the floor of a room. The ball experiences air resistance that is proportional to speed of the ball. Just before hitting the ceiling the speed of the ball is 10 m/s and its retardation is 2g. The ball rebounds from the ceiling without any loss of speed and falls on the floor 2s after making impact with the ceiling. How high is the ceiling? Take g = 10 m/s².arrow_forward
- A circus performer throws an apple toward a hoop held by a performer on a platform (see figure below). The thrower aims for the hoop and throws with a speed of 20 m/s. At the exact moment the thrower releases the apple, the other performer drops the hoop. The hoop falls straight down. (Assume d = 29 m and h = 48 m. Neglect the height at which the apple is thrown.) (a) At what height above the ground does the apple go through the hoop?arrow_forwardA basketball is tossed vertically up into the air from the edge of a roof 8.5 m above the ground. First, if the ball took 1.6 seconds from the point when released upward until it hit the ground, what was the ball's initial speed? Second, what was the greatest height reached by the ball with respect to the roof? Ignore air resistance and use a value of g = 10.0 m/s when answering this question. B IU A + v ... Paragraph 65% 72°F $C# ス liliarrow_forwardAn attacker at the base of a castle wall 3.65 m high throws a rock straight up with speed 7.40 m/s from a height of 1.55 m above the ground. (a) Will the rock reach the top of the wall? (b) If so, what is its speed at the top? If not, what initial speed must it have to reach the top? (c) Find the change inspeed of a rock thrown straight down from the top of the wall at an initial speed of 7.40 m/s and moving between the same two points. (d) Does the change in speed of the downward-moving rock agree with the magnitude of the speed change of the rock moving upward between the same elevations? (e) Explain physically why it does or does not agree.arrow_forward
- The ceiling of a classroom is 3.00 m above the floor. A student tosses an apple vertically upward, releasing it 0.55 m above the floor. What is the maximum initial speed that can be given to the apple if it is not to touch the ceiling?arrow_forwardJoe and Bill throw identical balls vertically upward. Joe throws his ball with an initial speed twice as much as the initial speed of Bill's ball. If there is no air resistance, the maximum height of Joe's ball will be O eight times that of Bill's ball. O two times that of Bill's ball. O equal to that of Bill's ball. None of the given choices O four times that of Bill's ball.arrow_forwardAn attacker at the base of a castle wall 4.00 m high throws a rock straight up with speed 4.50 m/s from a height of 1.60 m above the ground. (a) Will the rock reach the top of the wall? (b) If so, what is its speed at the top? If not, what initial speed must it have to reach the top? (c) Find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 4.50 m/s and moving between the same two points. (d) Does the change in speed of the downward-moving rock agree with the magnitude of the speed change of the rock moving upward between the same elevations? (e) Explain physically why it does or does not agree.arrow_forward
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