Under what condition can a force act on an object and yet do no work on that object?
A) If the net force on the object is zero.
B) If the force operates at constant (unchanging) power.
C) If the object does not move.
D) If the object moves with no acceleration.
E) Nonsense--any force on an object must do work on that object.
C
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The CO molecule would
a. probably be nonpolar. b. definitely be nonpolar. c. definitely be polar. d. probably be polar.
Where are elements heavier than iron primarily produced?
a. Brown dwarfs b. White dwarfs c. Supergiants d. Supernovae
During each cycle, the compressor in a certain ideal Carnot refrigerator performs 480 J of work to remove 150 J of heat from the interior of the refrigerator. How much heat do the coils behind the refrigerator discharge into the kitchen each cycle?
A) 110 J B) 150 J C) 330 J D) 480 J E) 630 J
Three objects experience interactions. Object A has mass, object B has electrical charge, and object C has both mass and electrical charge. Which of the following statements are true?
A. object A and object B experience an electrical interaction B. object A and object C experience a gravitational interaction C. object C experiences an electrical interaction with itself D. object A and object C experience an electrical interaction E. object A and object B experience a gravitational interaction