Some astronomers speculate there are as many Trojan asteroids around Jupiter as asteroids in the asteroid belt
a. True
b. False
Indicate whether the statement is true or false
True
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What occurs in a pan of water placed outdoors on a warm day?
A) evaporation B) condensation C) both of these D) neither of these
A 20-?F capacitor is attached across a 1 000-V power supply. What is the net charge on the capacitor?
a. 10 mC b. 20 mC c. 40 mC d. none of the above
What is the magnitude of a the vertical electric field that will balance the weight of a plastic sphere of mass that has been charged to -3.0 nC? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A) 6.9 × 106 N/C B) 7.8 × 105 N/C C) 1.5 × 106 N/C D) 2.1 × 106 N/C
If the shafts on the two gears shown in this figure had the same diameter, but were made of different materials, which shaft should be made of the stronger material to avoid breakage? (Hint: The torque exerted on each shaft must be the same as the torque on the gear to which it is attached.)
a. The shaft on the smaller gear since it must compensate for the smaller size of the gear. b. The torques on the two shafts will always be the same, so it does not matter. c. The shaft on the larger gear since it will have to withstand a greater torque.