A heat pump can
A) cool an environment.
B) warm an environment.
C) both of these
D) neither of these
Answer: C
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The sum of two vectors is the largest when the two vectors are _____.
A. pointing in the same direction B. pointing in opposite directions C. perpendicular to each other D. positioned at a 45
The unit kilowatt-hour is a unit of
A) energy. B) momentum. C) power. D) time.
A 10-kg dog is runnng with a speed of 5.0 m/s. What is the minimum work required to stop the dog in 2.40 s?
A) 125 J B) 50 J C) 75 J D) 100 J
The magnetic force on a charged particle moving at a constant speed in a uniform magnetic field will be doubled when the angle between the velocity of the particle and the direction of the magnetic field changes from 25.0° to
a. 57.7°. c. 12.2°. b. 12.5°. d. 50.0°.