EXAM 2 PHY 205 Fall 2017 Prof. D.Kyriakakis NAME ldentify the choice that best c

Question

EXAM 2 PHY 205 Fall 2017 Prof. D.Kyriakakis NAME ldentify the choice that best completes the statement or answers the question. Please Show ALL Your Work in the space provided. 1.In physics, work is defined as a. force times time. force times distance. c. distance divided by time d. force divided by time. e. b. force divided by distance. ryou lift two loads up one story, how much work do you do compared to lifing just one load up onse story? a. One quarter as much Four times as much c. The same amount d. Twice as much e. b. One half as much 3. If Nellie Newton pushes an object with twice the force for twice the distance, she does a. twice the work. b. the same work c. four times the work. d. eight times the work 4. The unit of work is the c. joule d. newton e, second. a. watt. b. meter. 5. Power is defined as the force on an object divided by the time the force acts. a. b. work done times the time taken to do that work. c. work done on an object divided by the time taken to do the work. d. distance divided by the time taken to move that distance. e. force on an object times the distance the object moves. 6. The unit of power is the a. newton. b. meter. c. joule. d. second. e. watt. 7. Potential energy is the energy an object has because of its c. location. d. speed. a. density e. temperature. size. . The amount of potential energy possessed by an elevated object is equal to a. the power used to lift it. b. the distance it is lifted. c. the force needed to lift it. d. the work done in lifting it. e. the value of the acceleration due t

Explanation / Answer

1) WORK DONE IS W= Force *displacement

so the answer is e)

2) W = Force *displacement

W = F*S

so the answer is d) twice as much

3) W = F*S

so the answer is c) four times the work

4) unit of work is c) joule

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