The time for the Moon to orbit Earth, relative to the stars is
A) 23 hours, 56 minutes.
B) about 7 days.
C) 27.3 days.
D) 29.5 days.
E) 18 years, 11.3 days.
C
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Which has the larger light-gathering power?
a. a telescope of 5 cm diameter and focal length of 50 cm b. a telescope of 6 cm diameter and focal length of 100 cm c. a telescope of 2 cm diameter and focal length of 100 cm d. a telescope of 3 cm diameter and focal length of 75 cm e. both b and c since they have the same focal length.
Consider two containers with the same volume and temperature. Container One holds "dry" air--a mixture of nitrogen and oxygen. Container Two holds "moist" air. The "moist" air has the same ratio of nitrogen to oxygen molecules, but also contains water vapor. According to the ideal gas law, if the pressures are equal, the weight of the gas in Container One will be
a. lighter than the gas inside the second container. b. equal to the weight of the gas in the second container. c. heavier than the gas inside the second container. d. all the above are incorrect because the pressures cannot be equal.
You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 6 cm wide but still 5 mm high. You must move your hand up and down once,
a. the same distance up as before, but take a shorter time. b. the same distance up as before, but take a longer time. c. a smaller distance up, but take a shorter time. d. a greater distance up, but take a longer time. e. a greater distance up, but take the same time.
An 800-N woman stands at rest on two bathroom scales so that one scale shows a reading of 500 N. The reading on the other scale is
A) 200 N. B) 300 N. C) 400 N. D) 800 N. E) none of the above