As a blinking light source approaching you gains speed, you see the frequency of flashes
A) increase.
B) decrease.
C) remain unchanged.
D) None of these.
Answer: A
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Springs: An ideal spring with a spring constant (force constant) of 22 N/m is stretched from equilibrium to 2.9 m. How much work is done in the process?
A. 93 J B. 186 J C. 47 J D. 121 J
Name four properties of Mars that are similar to those of Earth today.
a. Magnetic field; average density; atmospheric chemical composition; active water erosion of the surface. b. Differentiated body; location in the Solar System; has weather and seasons; surface temperatures can be Earthlike. c. Differentiated body; location in the Solar System; atmospheric chemical composition; active water erosion of surface. d. Magnetic field; average density; has weather and seasons; surface temperatures can be Earthlike.
Dean teaches that the phenomenon of regelation is due to the
A) freezing point of water. B) melting point of ice. C) open-structured nature of ice crystals. D) high specific heat of water.
A horizontally-projected beam of protons travelling at 55 km/s travels between two parallel plates separated by 7.4 cm, and 12 cm long, between which there is an electric field of 7.2 V/m upward. If the beam enters the region at a height of 3.7 cm above the lower plate, at what height above the lower plate is the beam when it exits? The proton mass is 
A. 4.4 cm B. 3.0 cm C. 5.1 cm D. 2.3 cm