Which is largest?
A) a galaxy
B) a local group
C) a Supercluster
D) the observable universe
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.
It is important that the two metals that compose a bimetallic strip have
A) different conductivities. B) different rates of expansion. C) equal thicknesses. D) all of the above E) none of the above
A hole is punched in a full milk carton, 10 cm below the top. What is the initial velocity of outflow?
A. 1.4 m/s B. 2.0 m/s C. 2.8 m/s D. 3.9 m/s E. 4.2 m/s
The total kinetic energy of a baseball thrown with a spinning motion is a function of:
a. its linear speed but not rotational speed. c. both its linear and rotational speeds. b. its rotational speed but not linear speed. d. neither its linear nor rotational speed.