A meterstick moving in a direction parallel to its length appears to be only 60.0 cm long to an observer. What is the meterstick's speed relative to the observer? (c = 3.00 × 10^8 m/s)
a. 1.19 × 10^8 m/s
c. 2.93 × 10^8 m/s
b. 2.40 × 10^8 m/s
d. 2.75 × 10^8 m/s
B
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Gravitational lensing
a. occurs when light passes near a massive object and is deflected by the object's gravitational field. b. can be used to determine the luminosity of a galaxy. c. occurs when the mass of a galaxy is greater than expected from the luminosity of the galaxy. d. occurs when the mass of a galaxy is less than expected from the luminosity of the galaxy. e. can be used to determine the recessional velocity of a galaxy.
Supergiants are about as common as the sun
Indicate whether the statement is true or false
A string is wound tightly around a fixed pulley having a radius of 5.0 cm. As the string is pulled, the pulley rotates without any slipping of the string. What is the angular speed of the pulley when the string is moving at 5.0 m/s?
A) 100 rad/s B) 50 rad/s C) 25 rad/s D) 20 rad/s E) 10 rad/s
A solar cell has a light-gathering area of 10 cm2 and produces 0.2 A at 0.8 V (DC) when illuminated with S = 1 000 W/m2 sunlight. What is the efficiency of the solar cell?
a. 16% b. 7% c. 23% d. 4% e. 32%