A string is stretched with a tension of 120 N. The string has a length of 2.5 meters. The velocity of wave propagation along the string is 220 m/s. The mass per unit length of the string is
a. 
b. 
c. 
d. 
e. 
e.
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Which of the following is true of stony meteorites?
A) They are silicate masses. B) They are a type of achondrite. C) They are mainly composed of iron. D) They are mainly composed of nickel.
If the push that you give to a bike is the action force, then the reaction force is ________
a. the force of the bike upon you b. the weight of the bike c. the friction force on the tires d. the acceleration of the bike e. air resistance on the bike
The primary reason few SSTs were ever built was because a. SSTs endangered the ozone layer. b. SSTs were not economically viable. c. the technology was risky and the planes likely to disintegrate in flight. d. computers predicted that the bow wave would cause oxygen to recombine with nitrogenin the air
e. SSTs travel through the stratosphere.
What information do we know about the known exoplanets?
A) estimates of orbits and masses B) complete composition C) precise masses D) All of the above E) None of the above