Stars to the upper left of the Hertzsprung-Russell diagram tend to be relatively
A) hot and blue.
B) long lasting.
C) huge.
D) yellow and of average size.
Answer: A
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A "short circuit" is best described as
A) a high voltage that is not connected to an electrical circuit. B) a low resistance placed across a high voltage. C) an electrical circuit with a very high voltage. D) an electrical circuit with a very high resistance. E) a high resistance placed across a low voltage.
A water wave spreading out in a circle across the surface of a pond is an example of
A) a two-dimensional wave. B) witchcraft. C) a one-dimensional wave. D) particle motion, or mass motion, rather than wave motion. E) a three-dimensional wave.
You are standing in a moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. The force acting on you that causes you to fall forward is
A) the force of gravity. B) the normal force due to your contact with the floor of the bus. C) the force due to static friction between you and the floor of the bus. D) the force due to kinetic friction between you and the floor of the bus. E) No forces were acting on you to cause you to fall.
A very delicate sample is placed 0.150 cm from the objective lens of a microscope. The focal length of the objective is 0.140 cm, and that of the eyepiece is 1.0 cm. The near-point distance of the person using the microscope is 25.0 cm
The magnitude of the final magnification of the microscope is closes to A) 375. B) 300. C) 250. D) 125. E) 100.