Which law refers to a planet sweeping out equal areas in equal times as it orbits its host star?
a. Kepler's first b. Kepler's second
c. Kepler's third d. universal law of gravitation
b
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The strong gravitational field of a white dwarf slows down the speed of escaping light, and results in the gravitational redshift.
Answer the following statement true (T) or false (F)
A piece of chocolate melts in your mouth. This is an example of
a. heat conduction. b. heat convection. c. heat radiation. d. thermal expansion. e. none of the above.
Unseen objects in our galaxy have been found by the bending effect they have on more distant stars' light passing near them. These small objects that don't emit light are calculated to have masses of about 10× the mass of the Sun. Which is the best choice for these objects?
a. black hole b. neutron star c. white dwarf d. main-sequence stars
A lawn mower has a 6-horsepower engine (1 HP = 750 W). If the engine has an efficiency of 20%, and the throttle is such that the engine cycles 10 times a second, the heat that is expelled in one cycle is
a. 1 800 J b. 2 000 J c. 2 200 J d. 2 400 J e. 2 250 J