Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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A rocket is fired vertically upward with an initial velocity of 80 m/s at the ground level. Its engine then fires and it accelerated at 4m/s2 until it reaches an altitude of 1200m. At that point, the engine fail and the rocket goes into free fall. Disregard air resistance. How long was the rocket above the ground?
You throw a small rock straight up from the edge of the roof of a building. The rock travels upward to a maximum height 20 m above the ground in a time t, misses the edge of the roof on its way down, and reaches the ground in a time T after it was thrown. Neglect air resistance and take g = 10 m/s2. Find the time t if the total time the rock is in the air is three times the time it takes it to reach its maximum height, i.e. if T = 3t.
A brick is dropped (zero initial speed) from the roof of a building. The brick strikes the ground in 2.50 s. You may ignore air resistance, so the brick is in free fall. (a) How tall, in meters, is the building? (b) What is the magnitude of the brick’s velocity just before it reaches the ground? (c) Sketch a − t, v − t, and y − t graphs for the motion of the brick.
Chapter 2 Solutions
Physics for Scientists and Engineers
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- A ball is thrown vertically upward with a speed of 15.0 m/s. (a) How high does it rise? (b) How long does it take to reach its highest point? (c) How long does the ball take to hit the ground after it reaches its highest point? (d) What is its velocity when it returns to the level from which it started? please answer darrow_forwardAs a runaway scientific balloon ascends at 19.6 m/s, one of its instrument packages breaks free of a harness and free-falls. The figure gives the vertical velocity of the package versus time, from before it breaks free to when it reaches the ground. (a) What maximum height above the break-free point does it rise? (b) How high is the break-free point above the ground? (a) Number (b) Number Units Units V 10 8 -t (s)arrow_forwardIf a stone is dropped from the top of a tower with initial release velocity equal to zero, it falls a distance d in time t given by d = ½ gt2 where g is acceleration due to gravity (g = 9.8 m/s2). Its speed v at time t is given by v = gt. Suppose you go to the top of a tower and drop a stone. It hits the ground after 4.5 seconds. By how much does it drop in 1 second? How much is its displacement between 1 s and 2 s? What is the height of the tower? Drop = 14.7 m, Displacement = 4.9 m, Height = 19.6 m Drop = 4.9 m, Displacement = 14.7 m, Height = 99 m Drop = 4.9 m, Displacement = 14.7 m, Height = 19.6 marrow_forward
- A kangaroo leaps upward at time t = 0. At time t = 1.0 s it is at a height of 2.0 m above the ground. At what time does it reach its maximum height? Express your answer in seconds. (Assume proximity to the Earth's surface and neglect friction).arrow_forwardA hoodlum throws a stone vertically downward with an initial speed of 18.0 m/s from the roof of a building, 50.0 m above the ground. (a) How long does it take the stone to reach the ground? (b) What is the speed of the stone at impact? (a) Number i Units (b) Number i Unitsarrow_forwardA parachutist bails out and freely falls 50 m. Then the parachute opens, and thereafter she decelerates at 2.0 m/s2. She reaches the ground with a speed of 3.0 m/s. (a) How long is the parachutist in the air? (b) At what height does the fall begin?arrow_forward
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- Crickets Chirpy and Milada jump from the top of a vertical cliff. Chirpy drops downward and reaches the ground in 3.10 s, while Milada jumps horizontally with an initial speed of 0.94 m/s. How far from the base of the cliff wilI Milada hit the ground? Ignore air resistance.arrow_forwardA ball is thrown straight upward. At 7.04 m above its launch point, the ball's speed is 3.36 times smaller than its launch speed. What maximum height above its launch point does the ball attain, in meters? Ignore air resistance. Use two decimals in your answer.arrow_forwardA concrete block is dropped from the roof of a building. The block hits the ground in 6.50 s. Ignoring air resistance. (a) How high, in meters, is the building? (b) What is the magnitude of the velocity just before it reaches the ground?arrow_forward
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