The use of fiberglass insulation in the outer walls of a building is intended to minimize heat transfer through the wall by what process?
a. conduction
c. convection
b. radiation
d. vaporization
A
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Halley's Comet is in a highly elliptical orbit around the sun. Therefore the orbital speed of Halley's Comet, while traveling around the sun,
A) is constant. B) increases as it nears the Sun. C) decreases as it nears the Sun. D) is zero at two points in the orbit.
Which of the following can make a string of carbon atoms a living thing?
A) The ability of carbon to act as a living thing independently B) The ability of oxygen to act as a living thing when combined with carbon C) The transmission of information from one carbon molecule to another D) The transfer of electrons from one carbon molecule to another
Two circus clowns (each having a mass of 50 kg) swing on two flying trapezes (negligible mass, length 25 m) shown in the figure. At the peak of the swing, one grabs the other, and the two swing back to one platform. The time for the forward and return motion is
?
?
a.
10 s.
b.
50 s.
c.
15 s.
d.
20 s.
e.
25 s.
Decreasing the voltage across the two plates of a capacitor will produce what effect on the capacitor?
a. decrease charge c. decrease capacitance b. increase capacitance d. increase charge