Suppose one twin takes a ride in a spaceship traveling at a very high speed to a distant star and then back again, while the other twin remains on Earth
Compared to the twin who remained on Earth, the astronaut twin is
A) the same age as the Earth-twin.
B) younger than the Earth-twin.
C) older than the Earth-twin.
D) The ages cannot be determined from the information provided.
B
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A quantum of electromagnetic radiation is a
a. wave function b. photon c. de Broglie wave d. laser e. hologram
The rest energy of an electron and its antiparticle, a positron, is 0.511 MeV. In order to produce an electron-positron pair, a gamma ray must have an energy larger than 1.022 MeV because of
a. time dilation b. length contraction c. the equivalence of mass and energy d. the principle of relativity e. none of the above
A 2.60 kg mass is moving in a circular path with a constant angular velocity of 5.50 rad/sec and with a tangential velocity of 3.50 m/sec. The centripetal force on the mass is
A. 30.4 N. B. 40.5 N. C. 50.1 N. D. 60.5 N. E. 66.7 N.
The terra of Venus are rare, but large continent size uplifted regions over a low surface
Indicate whether the statement is true or false