College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A weight lifter lifts a 380-N set of weights from ground level to a position over his head, a vertical distance of 2.05 m. How much work does the weight lifter do, assuming he moves the weight at constant speed?
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- Suppose a car travels 108 km at a speed of 20.0 m/s, and uses 2.10 gallons of gasoline. Only 30% of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (The energy content of gasoline is 1.3 ✕ 108 J per gallon.)(a) What is the force exerted to keep the car moving at constant speed? Narrow_forwardA person pushes a cart to the right with a force of 8 N at an angle of 0=40 degrees as shown in the diagram. The cart moves a horizontal distance by 10.0m, what is the work done by the force of gravity? (B) if the cart is moving at a constant velocity, determine the work done by the force of friction. C lastly, calculate the net work on the cartarrow_forwardYou stand at the top of a cliff and lower a first aid kit (attached to a rope) down the cliff to an injured hiker at a constant speed. What can you say about the work done by the rope and the work done by gravity on the kit as it is lowered? O The work done by the rope is positive and the work done by gravity is positive. The work done by the rope is negative and the work done by gravity is negative. O The work done by the rope is positive and the work done by gravity is negative. O The work done by the rope is zero and the work done by gravity is zero. O The work done by the rope is negative and the work done by gravity is positive.arrow_forward
- box, M initially at rest on a frictionless table, is pulled with constant force, F, through a distance d. A weight, m , lies on top of the box and is held in place with respect to the block by friction (coefficient μ) throughout the movement. What is the work, WP, done on the weight during the motion?arrow_forwardA 100 kg block is pulled at a constant speed of 5.5 m/s across a horizontal floor by an applied force of 137 N directed 37° above the horizontal. What is the rate at which the force does work on the block? Warrow_forwardA particle moves from A to D in (Figure 1) while experiencing force F = (2i +9j) N. Figure y (m) Ic 4 3- 2- 1- 0. A 0 1 2 B D 1 +x (m) 3 < 1 of 1 Part A How much work does the force do if the particle follows path ABD? Express your answer with the appropriate units. ► View Available Hint(s) W VABD = Submit Part B WACD= Submit HA Part C Value How much work does the force do if the particle follows path ACD? Express your answer with the appropriate units. ► View Available Hint(s) μA + Value pas Units Units P Pearson ? ?arrow_forward
- ACTIVITY 4: DECODE THE MESSAGE Directions: Determine the work done by the force on a given system in the following problems. Then, decode the message. I hv a e 4 Displacement (m E You pull your bag with a force of 30 N parallel to the ground classroom 20 m away. How much work will you do on your bag? MA crate is being lifted into a truck. If it is moved with a 2470 N force and 3650 J of work is done, then how far is the crate being lifted? M You must exert a force of 4.5 N on a book to slide it across a table. If you do 2.7 J of work in the process, how far have you moved the book? towards yourarrow_forwardA coin slides over a frictionless plane and across an xy coordinate system from the origin to a point with xy coordinates (2.20 m, 4.50 m) while a constant force acts on it. The force has magnitude 2.80 N and is directed at a counterclockwise angle of 103. from the positive direction of the x axis. How much work is done by the force on the coin during the displacement? Number i Unitsarrow_forward
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