The equation below is the solution to a problem.
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The best physical representation of this equation is
A. a sphere of 2.00-kg mass under a 6.00-N tension when at the bottom of a vertical circle.
B. a sphere of 2.00-kg mass under a 6.00-N tension when at the side of a vertical circle.
C. a sphere of 2.00-kg mass under a 6.00-N tension when at the top of a vertical circle.
D. a sphere of 2.00-kg mass at any point on a horizontal circle.
E. a 2.00-kg gecko running on the ceiling with a speed of 8.00 m/s.
Answer: C
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A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into the room per cycle. What is the coefficient of performance?
A. 4 J B. 20 J C. 24 J D. 44 J
The rate of heat flow by conduction through a slab does NOT depend upon the:
A. temperature difference between opposite faces of the slab B. thermal conductivity of the slab C. slab thickness D. cross-sectional area of the slab E. specific heat of the slab
The vector 
indicates the instantaneous displacement of a projectile from the origin. At the instant when the projectile is at 
, its velocity and acceleration vectors are
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. Which statement is correct?
A.
is always perpendicular to .B.
is always perpendicular to .C.
is always perpendicular to .D.
is always perpendicular to 
.E.
is always perpendicular to 
.Gluons
a. are carriers of the color force. b. possess color charge. c. can interact with each other via the color force. d. can form glueballs. e. all of the above