For an astronaut working outside a spaceship, the greatest loss of heat would occur by means of
a. conduction.
b. convection.
c. radiation.
d. conduction and convection.
e. conduction and radiation.
C
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The density of the Universe is
a. equal to the critical density if the Universe is closed. b. equal to the critical density if the Universe is flat. c. greater than the critical density if the Universe is flat. d. greater than the critical density if the Universe is open. e. None of the other choices are correct.
Time Dilation: Someone in Earth's rest frame says that a spaceship's trip between two planets took 10.0 y, while an astronaut on the space ship says that the trip took 5.78 y. What is the speed of the spaceship, assuming the planets are at essentially at rest?
A. 0.816 c B. 0.735 c C. 0.975 c D. 0.384 c
If you plug a 110-V electric toaster into a 220-V outlet, current in the toaster will be about
A) half what is should be. B) the same as if it were plugged into a 110-V outlet. C) more than twice what it should be. D) twice what it should be.
Car batteries are often rated in ampere-hours. This information designates the amount of ______ that the battery can supply
1.current 2.power 3.energy 4.charge 5.potential