A spaceship is moving away from an observer at relativistic speed. Its length at rest is 100 m, but the observer measures its length as 67 m. A time interval of 100 s on the spaceship would be measured by the observer to be which of the following?
a. 200 s
c. 50 s
b. 150 s
d. 100 s
B
Physics & Space Science
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Three resistors,
and 
are connected in parallel to a 9.0 V battery. What is the power dissipated by the 
?
A. 2.0 W B. 3.0 W C. 9.0 W D. 27 W E. 81 W
Physics & Space Science
The diagram below illustrates a portion of the model for the universe described by
Before the decoupling
A) the Universe was transparent to radiation. B) the Universe was opaque to radiation. C) protons and electrons combined to form atoms. D) there was more helium than hydrogen. E) deuterium produced electrons and positrons.
Physics & Space Science
A heat engine receives 7 900 J of heat from its combustion process and loses 3 200 J through the exhaust and friction. What is its efficiency?
a. 59% b. 35% c. 21% d. 41% e. 77%
Physics & Space Science