Earth possesses few visible craters and the moon possesses many. This is because
a. Earth formed later than the moon and, therefore hasn't encountered as many meteoroids.
b. the moon doesn't have an atmosphere that could burn up many of the meteorites before impacting.
c. erosion and plate tectonics have slowly removed evidence of past cratering on Earth.
d. all of the above
e. only b and c
E
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A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it approaches a stationary pedestrian. What frequency does the pedestrian hear? The speed of sound in air is 343 m/s
A) 200 Hz B) 375 Hz C) 400 Hz D) 425 Hz E) 450 Hz
Which gases within our atmosphere act as greenhouse gases?
a. water b. carbon dioxide c. oxygen and nitrogen d. all of the above e. a and b
Angie says that an object is in equilibrium if the net torques about the center of mass is zero. Robbie says that an object is in equilibrium if the sum of external forces is zero. Which one, if either, is correct?
A. Both are correct: an object is in equilibrium if either condition holds. B. Neither is correct: both conditions must hold simultaneously. C. Neither is correct: the net external force and the net external torque about any axis must be zero. D. Neither is correct: an object is in equilibrium only if its velocity is zero in all coordinate systems. E. Both are correct: if the sum of the external forces is zero, the net torque about any axis is automatically zero, and vice versa.
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