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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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An aircraft gains speed during takeoff due to the constant thrust of its engine. When is the acceleration during takeoff greatest-at the beginning of the run along the runway or just before the aircraft lifts into the air? why?
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- The speed skier has a frontal surface area of 0.75 m^2 and a Cd of 0.54 (assume that p=0.95 kg/m^3) If the slope is 58 degrees and the skier's weight (including the equipment) is 92 kg, what the maximum velocity the skier can attain?arrow_forwardA descending elevator is subject to a constant rate of acceleration, dropping 50.0 m as it goes from an initial velocity of 15.0 m/ downward, to rest. As a percentage of the occupants' masses, what is their apparent weight? 66% 77% 100% 123% 134%arrow_forwardAstronauts on a distant planet throw a rock straight upward and record its motion with a video camera. After digitizing their video, they are able to produce the graph of height, y, versus time, t, shown in the figure y (m) 30 25 20 15 10 1 2 t (s) 3 4 5 6 7 8 What is the acceleration of gravity on this planet? What was the initial speed of the rock? 5arrow_forward
- Suppose a car accelerates from 69 to 112 km/h? By what percent does the drag force on a car increase?arrow_forwardWhat is the magnitude of the acceleration of a skydiver who is currently falling at one-half his eventual terminal speed?arrow_forward27. Assume that the three blocks portrayed in Figure P4.27 move on a frictionless surface and that a 42-N force acts as shown on the 3.0-kg block. Determine (a) the accel- eration given this system, (b) the tension in the cord connecting the 3.0-kg and the 1.0-kg blocks, and (c) the force exerted by the 1.0-kg block on the 2.0-kg block. 42 N 3.0 kg 1.0 kg 2.0 kgarrow_forward
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