College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- A box with a mass of 46.0 kg is pushed with a horizontal force of 150 N. The box moves at a constant speed across a level, rough floor a distance of 5.55 m. (a) What is the work done (in J) by the 150 N force? J (b) What is the coefficient of kinetic friction between the box and the floor?arrow_forwardAnswer a b carrow_forwardA 2 kg block is pushed 4.0 m along a horizontal floor by a force of magnitude 25 N at an angle θ=30.0° with the horizontal. The coefficient of kinetic friction between the block and the floor is 0.35. Calculate the magnitudes of (a) the work done by the applied force, (b) the work done by friction force, (c) the work done by the normal force, (d) the work done by gravity, (e) the change in kinetic energy of the block.cos30o =sin60o=0.866 cos60o =sin30o=0.500 g=9.8 m/s2arrow_forward
- A small boat is crossing a pond on a windy day. During some interval of time, the boat undergoes the given displacement Ar: Ař = (3.50 m)i + (2.85 m)ĵ During the same interval of time, the wind exerts the given force F on the boat: F = (260 N) – (135 N)Ĵ (a) What is the total work done on the boat by the wind over this period of time? (b) What is the angle between the direction of the wind force and the direction of the boat's motion during this time interval?arrow_forwardA crate with a mass of 35.0 kg is pushed with a horizontal force of 150 N. The crate moves at a constant speed across a level, rough surface a distance of 5.30 m. (a) What is the work done (in J) by the 150 N force? J (b) What is the coefficient of kinetic friction between the crate and the surface?arrow_forwardA dock worker pushes am = 2.20 kg bin a distance d = 2.40 m along the floor by a constant force of magnitude F = 16.0 N directed at an angle 0 = 20.0° below the horizontal as shown in the figure. Assume the floor is frictionless. (Enter your answers in joules.) (a) Determine the work done on the bin by the applied force (the force on the bin exerted by the dock worker). (b) Determine the work done on the bin by the normal force exerted by the floor. (c) Determine the work done on the bin by the gravitational force. (d) Determine the work dong by the net force on the bin.arrow_forward
- A 58.1-kg skateboarder starts out with a speed of 2.03 m/s. He does 108 J of work on himself by pushing with his feet against the ground. In addition, friction does -243 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the skateboarder is 7.89 m/s. (a) Calculate the change (PEf - PE0) in the gravitational potential energy. (b) How much has the vertical height of the skater changed? Give the absolute value.arrow_forwardA horizontal force of 150 N is used to push a 40.0-kg packing crate a distance of 6.00 m on a rough horizontal surface. If the crate moves at constant speed, find (a) the work done by the150-N force and (b) the coefficient ofkinetic friction between the crate and surface.arrow_forwardCan someone help with second question? Thanksarrow_forward
- A tension force of 155 N inclined at 30.0° above the horizontal is used to pull a 35.0 kg shipping crate a distance of 5.10 m on a rough surface. If the crate moves at a constant speed, find (a) the work done by the tension force and (b) the coefficient of kinetic friction between the crate and surface. HINT (a) the work done by the tension force (in J) 688 Forces in the direction of an object's displacement do positive work on the object and tend to increase the object's speed. J (b) the coefficient of kinetic friction between the crate and surface -0 005 Need Help? Read It Watch itarrow_forwardYou are loading a refrigerator weighing 2377 N onto a truck, using a wheeled cart. The refrigerator is raised 1.05 m to the truck bed when it is rolled up a ramp. (Assume that there is no frictional force between the refrigerator and the ramp.) (a) Calculate the minimum work that must be done by the force you apply and the magnitude of the force if the ramp is at an angle with the horizontal of 45.0°. minimum work force (b) Calculate the minimum work that must be done by the force you apply and the magnitude of the force if the ramp is at an angle with the horizontal of 10.2°. minimum work forcearrow_forwardA block of mass m = 4.00 kg is pushed a distance d = 2.50 m along a frictionless horizontal table by a constant applied force of magnitude F = 16.0 N directed at an angle θ = 28.0° below the horizontal as shown in the figure below. (a)Determine the work done by the net force on the block.arrow_forward
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