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  6. The work done by static friction can be: A. positive. B.

Question :   6. The work done by static friction can be: A. positive. B. : 2102116

 

6. The work done by static friction can be:

A. positive.

B. negative.

C. zero.

D. Any of the above.

7. A satellite is held in orbit by a 2 000-N gravitational force. Each time the satellite completes an orbit of circumference 80 000 km, the work done on it by gravity is:

A. 1.6 ´ 108 J.

B. 1.6 ´ 1011 J.

C. 6.4 ´ 1011 J.

D. 0.

8. A student has to work the following problem: A block is being pulled along at constant speed on a horizontal surface a distance d by a rope supplying a force F at an angle of elevation q. The surface has a frictional force acting during this motion. How much work was done by friction during this motion? The student calculates the value to be –Fdsinq. How does this value compare to the correct value?

A. It is the correct value.

B. It is too high.

C. It is too low.

D. The answer cannot be found until it is known whether q is greater than, less than, or equal to 45?.

9. Which of the following is an example of a nonconservative force?

A. gravity

B. magnetism

C. friction

D. Both choices A and B are valid.

10. Which of the following is that form of energy associated with an object's motion?

A. potential

B. thermal

C. bio-chemical

D. kinetic

 

Solution
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Physics 1 Year Ago 83 Views
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