Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 7, Problem 42P
To determine
The length of the track.
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Answer A and B for question 2
2. An object was a mass of 10.0 kg is at rest at the top of a frictionless inclined plane of length 8.00 m and an angle of inclination 30.0° with the horizontal. The object is released from this position and it stops at a distance d from the bottom of the inclined plane along a horizontal surface, as shown in Fig. 8-6. The coefficient of kinetic friction for the horizontal surface of 0.400.
(a) What is the speed of the object at the bottom of the inclined plane?
(b) At what horizontal distance from the bottom of the inclined plane will this object stop?
Determine the work done to drag this piano horizontally along 2.0 m of the level floor with the coefficient of friction of 0.45
(Piano weight is 300kg)
Determine the work done to drag this piano horizontally along 2.0 m of the level floor with the coefficient of friction of 0.45.
Chapter 7 Solutions
Physics Fundamentals
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- In the dangerous sport of bungee jumping, a daring student jumps from a hot air balloon with a specially designed elastic cord attached to his waist. The unstretched length of the cord is 25.0 m, the student weighs 7.00 102 N, and the balloon is 36.0 m above the surface of a river below. Calculate the required force constant of the cord if the student is to stop safely 4.00 m above the river.arrow_forwardA 5.0-kg box rests on a horizontal surface. The coefficient of kinetic friction between the box and surface is K=0.50 . A horizontal force pulls the box at constant velocity for 10 cm. Find the work done by (a) the applied horizontal force, (b) the frictional force, and (c) the net force.arrow_forwardAn electric scooter has a battery capable of supplying 120 Wh of energy. If friction forces and other losses account for 60.0% of the energy usage, what altitude change can a rider achieve when driving in hilly ter-rain if the rider and scooter have a combined weight of 890 N?arrow_forward
- Jane, whose mass is 50.0 kg, needs to swing across a river (having width D) filled with person-eating crocodiles to save Tarzan from danger. She must swing into a wind exerting constant horizontal force F, on a vine having length L and initially making an angle with the vertical (Fig. P7.81). Take D = 50.0 m, F = 110 N, L = 40.0 m, and = 50.0. (a) With what minimum speed must Jane begin her swing to just make it to the other side? (b) Once the rescue is complete, Tarzan and Jane must swing back across the river. With what minimum speed must they begin their swing? Assume Tarzan has a mass of 80.0 kg.arrow_forwardAn object is on earth with a mass of 10.0 kg at the top of a frictionless inclined plane of length 8.00 m and an angle of inclination 30.0° with the horizontal, and with an initial velocity down the plane of 2.0 m/s. The object slides from this position and it stops at a distance d from the bottom of the inclined plane along a rough horizontal surface with friction, as shown. The coefficient of kinetic friction for the horizontal surface is 0.400. (a) What is the speed of the object at the bottom of the inclined plane? (b) At what horizontal distance d from the bottom of the inclined plane will this object stop? Use Work and Energy Principles to solve. Do not use Newton’s laws for constant acceleration: Zero credit if you do not use conservation of energy concepts.arrow_forwardAn object with a mass of 10 kg is initially at rest at the top of a frictionless inclined plane that rises at 30° above the horizontal. At the top, the object is initially 8.0 m from the bottom of the incline, as shown in the figure. When the object is released from this position, it eventually stops at a distance d from the bottom of the inclined plane along a horizontal surface, as shown. The coefficient of kinetic friction between the horizontal surface and the object is 0.20, and air resistance is negligible. Find the distance d.arrow_forward
- A skier who initially stands still and weighs 72 kg (including skis) begins to slide down the inclined surface at an angle of 18° to the horizontal. The coefficient of kinetic friction between the skis and the snow surface is μk = 0.12. Calculate the net work done by the forces acting on the skier during the first 7 seconds of the slide.arrow_forwardGive an example when work done by the force of gravity acting on a body is zero even though body gets displaced from its initial position.arrow_forwardA roller-coaster car shown in Fig 6-41 is pulled up to point 1 where it is released from rest. Assuming no friction, calculate the speed at points 2, 3, and 4.arrow_forward
- determine the work done to drag this piano horizontally along 2.0m of the level with the coefficient of friction of 0.45.arrow_forwardFind the net work done by friction on the body of a snake slithering in a complete circle of radius 1 m. The coefficient of friction between the ground and the snake is 0.25, and the snake's weight is 54.0N.arrow_forwarddetermine the work done to drag piano horizontally along 2.0 m of the level floor with the coefficient of friction of 0.45. (Given mass=300kg)arrow_forward
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