Sunsets are red because
A) the Sun emits more red light when it's setting.
B) sunlight must pass through more atmosphere then, and the atmosphere scatters even more light at bluer wavelengths, transmitting mostly red light.
C) sunlight must pass through more atmosphere then, and the atmosphere scatters more light at red wavelengths than bluer wavelengths.
D) the cooler atmosphere in the evening absorbs more blue light.
E) none of the above
B
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You look inside your piano and find that there are two types of strings: bare steel wire and steel wire wrapped with a copper coil. If you have one of each type of string with the same length and under the same tension, which will produce a lower frequency sound wave?
A. The bare wire will have a lower frequency. B. The wrapped wire will have a lower frequency. C. They will have the same frequency.
What would be the weight of a 59.1-kg astronaut on a planet twice as massive as Earth and having twice Earth's radius?
A) 580 N B) 290 N C) 1160 N D) 118 N E) 1200 N
How large a force is necessary to stretch a 2.0-mm diameter copper wire (Y = 11 × 10^10 N/m2) by 1.0%?
a. 2.1 kN b. 3.5 kN c. 6.9 kN d. 11 kN e. 5.4 kN
Gravitational lensing is the process by which
A) a massive object magnifies and distorts the light from an object behind it B) the wavelengths of light from a star are shifted as it moves about its center of mass C) a planet passes in front of its parent star and blocks part of its light D) a massive object accelerates another object that passes close to it