Which of the following hypothetical universes would be the youngest, assuming that all are expanding at the same rate?
A) the one that has the most dark matter
B) the nearly empty universe with no dark matter
C) the one that has the most dark energy
D) All of these universes would have the same age.
A) the one that has the most dark matter
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Suppose we use a baseball to represent Earth. On this scale, the other terrestrial worlds (Mercury, Venus, the Moon, and Mars) would range in size approximately from that of
A) a dust speck to a golf ball. B) a golf ball to a baseball. C) a dust speck to a basketball. D) a golf ball to a beach ball.
Three resistors of 4.0, 6.0, and 10.0 ? are connected in parallel. If the combination is connected in series with a 12.0-V battery and a 2.0-? resistor, what is the current through the 10.0-? resistor?
A) 0.59 A B) 2.7 A C) 6.4 A D) 11.2 A E) 16.0 A
Which of the following statements is incorrect?
a. Capacitance is always positive. b. The symbol for potential difference between the plates of a capacitor is . c. Water is a polar molecule. d. When a dielectric is placed in a capacitor it serves to reduce the electric field. e. Nonpolar molecules cannot be used for dielectric material in a capacitor.
Since the rate of heat transfer by conduction is proportional to the ?T, what percent savings in your heating bill would you expect if you turned the thermostat down from 75° to 65°F, and the outside temperature is 25°F?
a. 10% b. 20% c. 30% d. 40% e. 50%