If a planet has 9 times the radius of the Earth, but has the same density as the Earth, what is the gravitational acceleration at the surface of the planet? (g = 9.8 m/s2)
a. 29.4 m/s2
c. 265 m/s2
b. 88.2 m/s2
d. 39.2 m/s2
B
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The discovery of the cosmic microwave background was important because:
A) it established a firm center of the Universe. B) it was experimental verification of a prediction from the Big Bang theory. C) it proved that astronomy at radio wavelengths was possible. D) its detection was a major advance in microwave testing. E) it showed the universe must be closed, with more than the critical density here.
An instrument is rated at 250 W if it is connected across a 120-V dc power supply
(a) What current does it draw under normal operation? (b) What is its resistance? (c) How many kilowatt-hours does it use in a day if it is left on all the time?
Which of the following processes is due to
convection? a) The flowing of air from over cool water toward a warmer land area. b) The warming of the interior of a closed auto on a hot, sunny day. c) The frying of eggs in a hot pan. d) The direct warming of the Earth’s surface by the energy from the Sun.
Light is reflecting off a wedge-shaped thin piece of glass producing bright and dark interference fringes. If a certain location has a bright fringe, a nearby point will have a bright fringe if the thickness of the glass increases by:
a. one wavelength of the light. c. 1/8 of a wavelength of the light. b. 1/4 of a wavelength of the light. d. 1/2 of a wavelength of the light.