The formation of ice from water is accompanied by:
A. absorption of energy as heat
B. temperature increase
C. decrease in volume
D. an evolution of heat
E. temperature decrease
Answer: A. absorption of energy as heat
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Electromagnetic waves
A. need a medium such as water to propagate B. travel faster in a medium such as water than they do in a vacuum C. are longitudinal waves D. travel at the same speed in a vacuum regardless of wavelength
Materials in which the electrons are bound very tightly to the nuclei are referred to as
A) insulators. B) conductors. C) semiconductors. D) superconductors. E) polar.
Each edge of a cube has a length of 50.8 cm. What is the length of a diagonal of the cube going through the center of the cube?
a. 20.0 in c. 34.6 in b. 28.8 in d. 50.8 in
The magnetic force on a charged particle is always:
a. perpendicular to the particle's velocity. b. in the direction of the particle's velocity. c. absent for moving particles. d. parallel to the particle's velocity. e. in the opposite direction to the particle's velocity.