College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A 54 kg person climbs a set of stairs at a constant speed up a height of 3.4 m in 32 s. Calculate the gravitational potential energy at the top of the stairs.
a) 1.8 X 10² J
b) 5.3 X 10² J
c) 1.7 X 10³ J
d) 1.8 X 10³ J
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- A 2.35-kg object initially at rest has a gravitational potential energy of 74.6 J. Determine the speed of the object when it has moved under the influence of gravity to a location where its gravitational potential energy is 50.0 J. m/sarrow_forward1. A roller-coaster car with a mass of 1200 kg starts at rest from a point 20 m above the ground. At point B, it is 9 m above the ground. [Express your answers in kilojoules (kJ).] a. What is the initial potential energy of the car? b. What is the potential energy at point B? c. If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 40 000 J (40 kJ), what is the kinetic energy of the car at point B 2. The time required for one complete cycle of a mass oscillating at the end of a spring is 0.80 s. What is the frequency of oscillation?arrow_forward1480 kg car accelerates uniformly from a position of rest to a speed of 95 km/h in 6.0 s. a) Calculate the car's acceleration. b) How far did the car travel during this acceleration? b) How much work was done by the car during this 6.0 s?arrow_forward
- A block of mass m = 4.20 kg is released from rest from point and slides on the frictionless track shown in the figure below. (Assume h = 6.00 m.) h₂ m 3.20 m 2.00 m (a) Determine the block's speed at points and Ⓒ. point Ⓡ point Ⓒ m/s m/s (b) Determine the net work done by the gravitational force on the block as it moves from point J to point Ⓒarrow_forwardThe (non-conservative) force propelling a 1.40 x 103-kg car up a mountain road does 6.90 x 106 J of work on the car. The car starts from rest at sea level and has a speed of 28.0 m/s at an altitude of 2.40 x 102 m above sea level. Obtain the work done on the car by the combined forces of friction and air resistance, both of which are non-conservative forces. Number Unitsarrow_forwardAn object with a mass of 15kg slides down an incline with a length of 6.0m at an angle of 28 degrees from horizontal. The coefficient of friction between the object and incline is 0.25 a) How much work does the gravitational force perform on the object? b) How much work does the frictional force perform on the object? c) What will its speed be as it reaches the bottom of the incline?arrow_forward
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