College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- Solve the problem. A rocket is propelled upward from a height of 112 feet at an initial velocity of 96 ft./s period after how many seconds does the rocket hit the ground?arrow_forwardFrom the top of a cliff, a person throws a stone straight downward. The initial speed of the stone just after leaving the person's hand is 9.9 m/s. (a) What is the acceleration (magnitude and direction) of the stone while it moves downward, after leaving the person's hand? Also, is the stone's speed increasing or decreasing? (b) After 0.48 s, how far beneath the top of the cliff is the stone? (Give just the distance fallen, that is, a magnitude.)arrow_forwardA skydiver falls d1=355m in t1=8.7s before opening her parachute. After the chute opens, she falls an additional d2=780m in t2=116s. Calculate the skydiver’s average speed, v avg in meters per second, during the entire fall.arrow_forward
- A ball thrown horizontally from a height of 1.2m hits the ground at a distance of 5.0m. What was the initial speed of the ball (in m/s)?arrow_forwardThe position of a particle is r(t) = (5.0t2î – 4.0j + 6.0t³k) m. (a) What is the velocity of the particle at 0 s and at 1.0 s (in m/s)? (Express your answers in vector form.) v(0 s) m/s v(1.0 s) m/s (b) What is the average velocity between 0 s and 1.0 s (in m/s)? (Express your answer in vector form.) Vavg m/sarrow_forward(a) Calculate the height (in m) of a cliff if it takes 2.30 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.07 m/s. (Enter a number.) m (b) How long (in s) would it take to reach the ground if it is thrown straight down with the same speed? (Enter a number.) s †arrow_forward
- The height of a helicopter above the ground is given by y(t)=4.5t^(2), in meters. After 2.0 seconds the helicopter releases a mailbag, how long does it take for the mailbag to hit the ground?arrow_forwardA hoodlum throws a stone vertically downward with an initial speed of 12.3 m/s from the roof of a building, 20.0 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?arrow_forwardA hoodlum throws a stone vertically downward with an initial speed of 15.0 m/s from the roof of a building, 36.0 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?arrow_forward
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