Power is the rate at which you do work. You spend more power when you A) do the same work for a shorter time B) do the same work for a longer time C) do less work for a longer time D) do the same work over longer distance E) do more work over a shorter distance

A force, varying with distance as shown in the graph below, acts on a 5.5 kg object. When is most work done, in the first 4 meters or between 4 and 6 meters? Explain your response. 4.0 3.0 2.0 1.0 2.0 4.0 6.0 8.0 Find the work done by the force in moving the object from 0 m to 6.0 m. Explain your calculation and give units. Figure 9-15 C. Assuming that there is no friction or air resistance what is the total change in the object's energy? Explain your answer. b. FORCE (N)

When released, a 120-g block slides down the path shown below, reaching the bottom with a speed of 4 m/s. How much work does the force of friction do? 2.0 m 4.0 m/s Image Description W = J

As a motorized cart is pulling a wooden block on a metal surface, the cart is doing work on the block through the tension in the string. Find the other forces that are doing work on the cart. Are there forces acting on the block that do no work? What is the net work being done?

A rope applies a horizontal force of 500 N to pull a crate a distance of 2 m across the floor. A frictional force of 50 N opposes this motion. What is the net work done on the crate? a) 1000 j b) 100 j c) 900 j d) 1100 j

You are using a lever to lift the edge of a crate in order to slide a roller under it. The crate weighs 4250 N.  You are able to exert a force of 450 N and can move the handle of the lever 0.8 meters. The crates lift a distance of 0.05 meters. A) What is the Input work?     B) What is the efficiency of the lever    C) What is the levers actual mechanical advantage

QUESTION 5 Which of the following statements about energy is not true? The mechanical energy of a physical system is constant when the forces acting on the system are all conservative forces. a. O b. According to the work-energy theorem, the forces that contribute to the net work include all the conservative and nonconservative forces. c. The total energy of the universe is always conserved. O d. Energy can change form, but it cannot be created or destroyed. O e. Mechanical energy is always conserved ONH

A 1200 gram ball rolling down a hill started with a velocity of 2 m/s. After 3 minutes, the velocity of the ball is 5.5 m/s. Determine the rate of work in Watts. *

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You and your best buddy have to carry two crates up a flight of stairs. Your crate is twice as heavy as your buddy’s. Your buddy is doing _____ work as you are doing.