When a liquid evaporates
A) the temperature of the substance increases.
B) the temperature of the substance decreases.
C) heat energy leaves the substance.
D) heat energy enters the substance.
D
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Thin Lenses: A 14-mm tall postage stamp is 4.0 mm from a converging lens. If the image of the stamp is 4.0 mm tall, how far is it from the lens?
A. 14 mm B. 8.7 mm C. 1.4 mm D. 1.1 mm
________ form when galaxies collide and ________.
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The current in an inductor connected to an AC voltage source lags the voltage. This lag is caused by the:
a. back emf in the coil. b. voltage across the coil. c. time required for electrical signals to travel through all the coils of an inductance. d. resistance of the coil.
A laser beam strikes a plane mirror's reflecting surface with an angle of incidence of 43°. What is the angle between the incident ray and the reflected ray?
A) 43° B) 86° C) 45° D) 90° E) 0°