6. Four students took turns applying a force to an object in a physics lab. The graph below shows the force applied to the object by these four students plotted versus displacement. Which student performed 0.56 J of work on the object? A. Yuko B. Man C. Leo D. Tony

A 100gram ball thrown vertically downward stricken the ground with a speed of 20m/s. It then bounces, and reaches a final height of 5.0 meters. a.what is the ball's kinetic energy  b. What is the ball's potential energy at the 5.0-m height c. What is the ball's kinetic energy immediately after it rebounds from the surface  d. What is the ball's speed immediately after it rebounds from the surface

Which of the following statements are TRUE? A. Energy is a vector physical quantity. B. Energy is always required to do work. C. Totol mechanical energy can never be zero. D. When law of conservation of mechanical energy is invoked, there can never be a waste energy in an ideal system. E. When law of conservation of mechanical energy is invoked, there can never be a waste energy in a real-world system. F. Kinetic energy can be negative. G. Potential energy can be negative. H. Work is equivalent to the negative change in kinetic energy. I. Work is equivalent to the negative change in potential energy. J. In a conservative system where only gravitational force acts, the total mechanical energy is constant at every point of the motion. K. In a non-conservative system where certain external forces may act, the total mechanical energy is not constant at every point of the motion. L The entire universe may be considered as a closed system where the total energy is constant. chnices O B. D.…

Before railroads were invented, goods often traveled along canals, with mules pulling barges from the bank. If a mule is exerting a 1200 N force for 10 km, and the rope connecting the mule to the barge is at a 20 degree angle from the direction of travel, how much work did the mule do on the barge?  a. 12 MJ b. 11 MJ c. 4.1 MJ d. 6 MJ

A certain force does −7 J of work in moving an object located at position A to position B. The same force then does −7 J of work in moving it back from position B to position A. No other forces did work. Was mechanical energy conserved? Was energy conserved? a. Total energy was conserved but not mechanical energy. b. Mechanical energy was conserved but not total energy. c. Both mechanical energy and total energy were conserved d. Neither mechanical energy nor total energy was conserved.

You lift your backpack from the ground and moved forward to your car. Which of the following statements is true? A. Work is done on the backpack while lifting it and moving it forward. B. Work is done on the backpack while lifting it and but not when moving it forward. C. No work is done on the backpack while lifting it but work is done on it when moving it forward. D. No work is done on the backpack at all.

Choose all the correct statement that applies to Work.   A. Work is the product of force and distance.   B. Work is a vector quantity.   C. Work is a scalar quantity.   D. work has magnitude only.

5. Mark and David are loading identical cement blocks onto David's pickup truck. Mark lifts his block straight up from the ground to the truck, whereas David slides his block up a ramp on massless, frictionless rollers. Which statement is true? A. Mark does more work than David B. Mark and David do the same amount of work C. David does more work than Mark D. None of these statements is neces sarily true because the angle of the incline is unknown E. None of these statements is neces sarily true because the mass of one block is not given 6. A worker pushes a wheelbarrow 5.0 m along a level surface, exerting a constant horizontal force of 50.0 N. If a frictional force of 43 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow? A. 250 J B. 215 J C. 35 J D. 15 J E. 45 J 7. An athlete jumping vertically on a trampoline leaves the surface with a velocity of 8.5 m/s upward. What maximum height does she reach?A. 13 m B. 2.3 m C. 3.7…

QUESTION 9 While moving a package up and down on a storage shelf the mover does +500 J of work and gravity does-500 J of work. Which statement is true about the Potential Energy and the Kinetic Energy of the package: A. The Potential Energy of the package is decreased. B. The Potential Energy of the package is increased. C. The Kinetic Energy of the package is increased. D. The Kinetic Energy of the package is decreased. E, The Potential Energy of the package does not change.

A sprinter is practicing exiting the starting blocks with a large amount of power. What can the sprinter do to increase their power? A. Perform more work in the same amount of time B. Apply the same amount of work in a longer amount of time C. Perform the same amount of  work in a longer amount of time