
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A 50 kg box has an initial velocity of 10 m/s down an inclined plane of 30-degrees. The coefficient of friction between the box and the surface is 0.75. The box's...
Potential energy is decreasing and its kinetic energy is increasing
Potential energy and kinetic energy are increasing
Potential energy and kinetic energy are decreasing
Potential energy is increasing and its kinetic energy is decreasing
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- A factory worker pushes a 24.0 kg crate a distance of 8.0 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and floor is 0.24. What magnitude of force must the worker apply? How much work is done on the crate by this force? How much work is done on the crate by friction?arrow_forward. Calculate the potential energy of a 75 Kg boulder sitting at the edge of a cliff that is 210 meters from the ground (yf=0). b. If the boulder is suddenly pushed over the side of the cliff what is the velocity of the boulder when it is 50 meters from the ground?arrow_forwardA roller coaster starts with a speed of 4.1 m/s at a point 51 m above the bottom of a dip. Neglecting friction, what wil be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip? Answer: m/sarrow_forward
- A child with a weight of 110 N swings on a playground swing attached to 1.90 m long chains. What is the gravitational potential energy (in J) of the child-earth system relative to the child's lowest position at the following times? a) when the chains are horizontal. b) when the chains make an angle of 25.0° with respect to the vertical and c)when the child is at his lowest positionarrow_forward= 7.50 m. The figure below shows a box with a mass of m = 7.10 kg that starts from rest at point A and slides on a track with negligible friction. Point A is at a height of ha A MET 3.20 m 2.00 m m ha (a) What is the box's speed at point B (in m/s)? m/s What is the box's speed at point C (in m/s)? m/s (b) What is the net work (in J) done by the gravitational force on the box as it moves from point A to point C?arrow_forward"20 kg bear slides, from rest, 8 m down a Lodgepole Pine tree, moving with a speed of 5.6 m/s just before hitting the ground. What change occurs in the gravitational potential energy of the bear Earth system during the slide?"arrow_forward
- Question 8 This graph shows different types of energy for a roller coaster car that starts at the top of a large hill and goes down to its lowest point at 6 s. Energy of a Roller Coaster Car 500 450 400 According to the graph, what is the most likely relationship between height and potential energy? 350 3 300 S 250 200 150 100 50 10 Time (s) - Mechanical Energy ...... Potential Energy Kinetic Energy Your answer: O They are directly related. O They are inversely related. O There is no relationship between the two. O There is not enough information for a conclusion.arrow_forwardA particular spring on the Earth is found to have a spring constant of k = 1400 N/m. If the same spring is taken to Marsa. The spring constant will be less than on Earthb. The spring constant will be the same as on Earthc. The spring constant will be more than on Earthd. Springs do not work on Marse. We cannot answer this question because we cannot get a spring to Marsarrow_forwardAn athlete throws a 1.5 kg ball with a horizontal speed of 9 m/s, from a height of 4.8 metres above the ground. a) Calculate the kinetic energy, gravitational potential energy and total mechanical energy of the ball at its starting position. b) Calculate the maximum speed attained by the ball, just as it reaches the ground's surface.arrow_forward
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