Mrs. Jones went on a diet and lost 15 kilograms. How many pounds did she lose?
A) 68 pounds
B) 42 pounds
C) 38 pounds
D) 33 pounds
E) 6.8 pounds
D
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Far infrared astronomy must be done from high-flying aircraft because
a. far infrared radiation is absorbed low in Earth's atmosphere. b. far infrared photons are quite energetic. c. far infrared telescopes are not very heavy. d. far infrared sources are very bright. e. none of the above
Surface tension of liquids
A) increases when wetting agents are added. B) decreases as the liquid temperature increases. C) is about the same for all liquids. D) results from a thin molecular membrane beneath the liquid surface. E) keeps steel ships afloat.
A15-? resistor is connected in parallel with a 30-? resistor. If this combination is now connected in series with an ideal 9.0-V battery and a 20-? resistor,
what is the current through the 15-? resistor? A) 0.26 A B) 0.20 A C) 0.13 A D) 0.10 A
Stable equilibrium is:
a. an equilibrium state where any small rotation results in a torque that acts to produce rotation back in the opposite direction. b. any form of equilibrium, because all equilibrium conditions are stable. c. an equilibrium state where nothing is moving. d. an equilibrium state where there is no net torque or net force. e. an equilibrium state where no torque is involved.