A non-uniform meter stick is found to balance on a knife edge at the 60-cm mark. Where is the center of gravity of the meter stick?
a. at the 40-cm mark
b. at the 45-cm mark
c. at the 50-cm mark
d. at the 55-cm mark
e. at a position not given
e
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A mercury thermometer has a glass bulb of interior volume 0.100 cm3 at 10°C. The glass capillary tube above the bulb has an inner cross-sectional area of 0.012 mm2. The coefficient of volume expansion of mercury is 1.8 × 10-4 K-1
If the expansion of the glass is negligible, how much will the mercury rise in the capillary tube when the temperature rises from 5°C to 35°C if the bulb was full at 5°C? A) 0.45 mm B) 4.5 mm C) 45 mm D) 45 cm
A 17.0-mF capacitor is connected to an AC source with an rms voltage of 120 V and a frequency of 60.0 Hz. What is the rms current in the capacitor?
a. 1.41 A c. 0 A b. 0.543 A d. 0.769 A
Parallel-Plate Capacitor: Two parallel square metal plates that are 1.5 cm apart and 22 cm on each side carry equal but opposite charges uniformly spread out over their facing surfaces. How many excess electrons are on the negative surface if the electric field between the plates has a magnitude of 18,000 N/C? (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C)
What will be an ideal response?
When energy flows as heat from a hotter object to a colder one:
a. the kinetic energy of microscopic particle motions in the hotter object decreases. b. the kinetic energy of microscopic particle motions in the hotter object increases. c. only thermal energy changes in each object; kinetic energy remains the same. d. it does work on the colder object. e. the kinetic energy of microscopic particle motions in both objects increases.