If dark matter were to be found on this planet it would likely be
A) high in our atmosphere.
B) within our oceans.
C) within Earth's mantle.
D) at the center of Earth's core.
Answer: D
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What is the purpose of a "star shade" in efforts to directly detect extrasolar planets?
A) The star shade blocks light from the central star, so planets can be seen. B) The star shade cools the star, so it does not emit so much contaminating light. C) The star shade keeps the telescope cooler, so it does not emit as much infrared light. D) The star shade changes the wavelength of starlight, so it is easier to distinguish from planet light. E) The star shade separates starlight from planet light based on temperature.
To measure how Mercury spins, astronomers sent ________ to Mercury and used the Doppler shift to determine how fast it was rotating
A) probes B) laser beams C) radar beams D) a satellite E) a single frequency radio signal
The law of inertia says that
A) if there is no force on a body, the body will have no acceleration. B) if there is a force on a body, the body will have a changing acceleration. C) if there is a force on a body, the body will have an unchanging velocity. D) if there is no force on a body, the body will have a changing velocity. E) if there is a force on a body, the body will have no acceleration.
A mass of 4.5 kg, resting on a horizontal frictionless surface, is attached on the right to a horizontal spring with spring constant 29 N/m and on the left to a horizontal spring with spring constant 60 N/m. If this system is moved from equilibrium, what is the effective spring constant?
a. –31 N/m b. 31 N/m c. 89 N/m d. –89 N/m e. 16 N/m