Showing 211 to 220 of 494 Questions
  • A Super Ball is dropped from a height of 4.00 m. Assuming the ball rebounds with 95% of its impact speed, (a) The ball would bounce to (1) less than 95%, (2) equal to 95%, or (3) more than 95% of the initial height? (b) How high will the ball go?

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  • A Superball is dropped from a height of 2.5 m and rebounds off the floor to a height of 2.1 m. If the ball is in contact with the floor for 0.70 ms, determine (a) The direction and (b) Magnitude of the ball’s average acceleration due to the floor.

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  • A swimmer is capable of swimming 0.45 m/s in still water. (a) If she aims her body directly across a 75-m-wide river whose current is 0.40m/s, how far downstream (from a point opposite her starting point) will she land?(b) How long will it take her to reach the other side?

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  • A tennis ball is dropped from a height of 10.0 m. It rebounds off the floor and comes up to a height of only 4.00 m on its first rebound. (Ignore the small amount of time the ball is in contact with the floor.) (a) Determine the ball’s speed just before it hits the floor on the way down. (b) Determine the ball’s speed as it leaves t

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  • A test rocket containing a probe to determine the com-position of the upper atmosphere is fired vertically upward from an initial position at ground level. During the time t while its fuel lasts, the rocket ascends with a constant upward acceleration of magnitude 2g. Assume that the rocket travels to a small enough height that the Earth

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  • A toy rocket is launched (from the ground) vertically upward with a constant acceleration of 30.0 m/s2. After traveling 1000 m, its engines stop. When it reaches the very top of its motion, it falls for 0.500 s before a parachute deploys and it descends safely to the ground at the speed it has at that time. (a) What is the maximum altitu

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  • A train makes a round trip on a straight, level track. The first half of the trip is 300 km and is traveled at a speed of 75 km/h. After a 0.50 h layover, the train returns the 300 km at a speed of 85 km/h. What is the train’s (a) Average speed and (b) Average velocity?

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  • A train normally travels at a uniform speed of 72 km/h on a long stretch of straight, level track. On a particular day, the train must make a 2.0-min stop at a station along this track. If the train decelerates at a uniform rate of 1.0 m/s2 and, after the stop, accelerates at a rate of 0.50 m/s2, how much time is lost because of stop-ping

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  • A train of length l = 350 m starts moving rectilinearly with constant acceleration w = 3.0. 10-2 m/s2; t = 30 s after the start the locomotive headlight is switched on (event 1), and τ= 60 s after that event the tail signal light is switched on (event 2). Find the distance between these events in the reference frames fixed to the tra

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  • A train on a straight, level track has an initial speed of 1.50 m/s2. A uniform acceleration of is applied while the train travels 200 m. (a) What is the speed of the train at the end of this distance? (b) How long did it take for the train to travel the 200 m?

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