When a system does work without adding heat, the temperature of the system
A) increases.
B) decreases.
C) remains unchanged.
D) none of the above
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In a heat pump, cooling is accomplished when
A) condensation occurs in its coils. B) vaporization occurs in its coils. C) both of these D) neither of these
Which statements are true about a VIRTUAL image? (There may be more than one correct choice.)
A) Its location can be calculated, but it cannot be viewed directly by your eye without using auxiliary lenses. B) It cannot be photographed. C) It cannot be viewed on a screen. D) A plane mirror always forms a virtual image. E) A concave lens always forms a virtual image.
In one-dimensional motion where the direction is indicated by a plus or minus sign, the average velocity of an object has which of the following properties?
a. It is positive. b. It is negative. c. It is zero. d. It can be positive, negative, or zero.
A 3.0-kg block slides on a rough horizontal surface. A force of 8.0 N acting parallel to the surface is applied to the block. The coefficient of kinetic friction between the block and the surface is 0.15. What is the magnitude of the block's acceleration?
A. 1.9 m/s2 B. 1.2 m/s2 C. 2.3 m/s2 D. 1.5 m/s2 E. 2.9 m/s2