In the SI system the un of work is the (a) Watt, (b) horsepower (c), Joule (d) N

Question

In the SI system the un of work is the (a) Watt, (b) horsepower (c), Joule (d) Newton, 12. Work units as expressed in the basic SI units are a) N/m, (b) kg m/s (c) kg m /s d) kg m /s 13. Negative work indicates that (a) the kinetic energy decreases, (b) the applied force component and displacement are at right angles, (c) the work can't be done, (d) none of the preceding A Block is moved to the right through a displacement vector s as shown below. Several forces are acting on the block. 14. What can be said about the sign of the work done by the force F1 (a) It is positive. (b) It is negative. (c) It is zero. (d) There is not enough information to answer the question. 15 What can be said about the work done by force F (a) It is positive. (b) It is negative. (c) It is zero. (d) There is not enough information to answer the question. 16. Each of the boxes with masses noted, Ts pulled for 10 m across a level frictionl floor by the noted force. 10 N 15 N 5.0 N 2.0 kg 0.50 kg Which box experiences the smallest change in kinetic energy? 17. Work can be calculated in terms of this aspect of a force versu distance graph: 20 N 12 N (a) the intercept of the (b) the slope of th 0.30 kg under the curve (c) the area (d) all of the previous responses are valid. (e) none of the previous responses are valid 18. If the net work done by external forces on a particle is zero, which of the following statements about the particle must be true? (a) s velocity is zero (b) Its speed is unchanged. (c) velocity is decreased. (d) Its velocity is unchanged. s (e) more information is needed 19 ff the speed of an object is doubled, its kinetic energy increases by a factor of (a) 2, (b) 4 (c) 6, d) none of the above

Explanation / Answer

my answer is 11) C 12) A 13 ) D 14) D 15) C

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