4. A 1000-N force is applied onto a block with a mass of 150-kg as shown below. The block starts from rest and the coefficient of kinetic friction between the block and the incline is u = 0.15. a. b. C. d. Draw a free-body diagram for the block Determine the block's acceleration Determine the block's velocity when it reaches the top of the incline. Determine the work produced by the force of gravity. 5 m 30⁰ 150-kg F-1000 N

A baseball hits the catcher’s glove with a horizontal velocity of 55m/s. The mass of the baseball is 0.15kg. The displacement of the ball due to the deformation of the catcher’s glove and the movement of the catcher’s hand is 23cm from the instant the ball makes contact with the glove until it stops. a. How much kinetic energy does the baseball have just before it strikes the glove? b. How much work does the catcher have to do to the ball during the catch and is it positive or negative? c. What is the average impact force exerted by the glove on the baseball? Answer parts a-c. Include units and direction.

Which of the statements below is true when you catch a baseball that comes at you horizontally?   a. The work that you do is positive.     b. The work that you do is negative.   c. Work is not a vector and cannot be referred to as positive or negative.       d. Work is a scalar product expressed in terms of magnitudes, so it is never negative.     e. Work is expressed in terms of kinetic energy, which must be positive.

You lift a box off the ground and then hold it at a height above your waist. Which does not describe the work or energy in this process? A. You did positive work on the box. B. Gravity did negative work on the box C. The box's gravitational potential energy increased. D. The box's kinetic energy remained constant throughout the process.

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

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.

Two children have identical spring-loaded catapults, which contain springs with spring constant k. If Samir compresses the spring in his catapult by a distance x and Mona compresses hers by a distance 2x, how does the work they have done to compress their catapults compare? A. Mona has done 2 times as much work as Samir. B. Samir has done 2 times as much work as Mona. C. They have done the same amount of work. D. Mona has done 4 times as much work as Samir.

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…