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Homework answers / question archive / Work can be a positive quantity
Work can be a positive quantity. a negative quantity. equal to zero. all of the above 9-9?!" which situation Involves the largest amount of work done? a. Lifting a heavy box from the floor to a table. is. Lifting a light boa from the floor to a table. c. Sliding a light box a long distance along a horizontal ?oor. d. Sliding a heavy box a long distance down an Inclined ramp. The kinetic energyof an object has doubled. choose the correct statement. lts mass was doubled. Its speed was doubled Friction disappeared. Both the mass and the speed were doubled. one!» Kinetic energy Is the energy that an object has because of its motion. position. mass. momentum. on?!» 98- 1 Consider a rocket travelling In a straight line for a small distance. Choose the correct formulals) for expressing the work done by the rottet. a. W— M, b' W- slew: - éuv: C— W- and d. all of the above Choose the correct statement. a. Potential energy = kinetic energy 4- mechanical energy. b. Gravitational potential energy 2 9.8 mis'. c. Gravitational potential energy and kinetic energy are both measured in joules. d. Kinetic energy takes the direction at the force applied to the object. The gravitational potential energy of an object near Earth's surface depends on the mass of the object. the acceleration due to gravity. 9. the object's change in height relative to a reference height. all of the above P-F'P'!" Choose the correct statement about potential energy. a. Potential energy Is the stored energy an obiect has that can be released into another form of energy. b. Mechanical energy is the sum of the kinetic and potential energies. c. Gravitational potential energy is the energy that an object has due to Its height above a reference point. d. all of the above A stone is dropped from rest from the top of a 2.0 to high wail. M the start of the drop. the gravitational potential energy of the stone is 1.3 x 10' 1. relative to the base of the wait. What is the kinetic energy when the stone reaches the ground? a. 0 J b. 1.3 x 102 l c. 2.6 x 10' l d. -1.3 X 1!?!1 J
