Wavelengths of light are most efficiently measured in:
a. meters.
b. inches.
c. millimeters.
d. centimeters.
e. nanometers.
e
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The Milky Way Galaxy is a part of a galaxy cluster known as _____
A) the Virgo Cluster B) the Local Group C) the M 81 Group D) the Bullet Cluster
Uniform Circular Motion: A race car traveling at a constant speed of 50 m/s drives around a circular track that is 500 m in diameter. What is the magnitude of the acceleration of the car?
A. 0 m/s2 B. 1.0 m/s2 C. 10 m/s2 D. 0.63 m/s2 E. 2.2 m/s2
The stars farther than 20 000 LY from the center of the Milky Way are traveling too fast to be bound to the galaxy by the observed mass of the galaxy. Which of the following are currently being investigated as possible explanations of this?
a. neutrino mass b. WIMPs c. Newtonian dynamics are not quite correct. d. all of the above
The surface water temperature on a large, deep lake is 3°C. A sensitive temperature probe is lowered several meters into the lake. What temperature will the probe record?
A) a temperature warmer than 3°C B) a temperature less than 3°C C) a temperature equal to 3°C D) There is not enough information to determine.