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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________ form when galaxies collide and ________.
A. Quasars; emit large amounts of heat and radio waves B. Starburst galaxies; star formation is triggered, making them very bright C. S0 galaxies; all their stars are destroyed D. Starburst galaxies; all their stars are destroyed
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°
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.
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