The fraction of incident light that a body reflects is known as its
a. Rayleigh scattering.
b. insolation.
c. albedo.
d. humidity.
c
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While you are standing in the aisle of a bus, the driver suddenly makes a left turn. You lurch to the right due to
A) an unbalanced force. B) your tendency to keep moving forward. C) an equilibrium challenge.
The estimated age of the Milky Way Galaxy is about ________.
A. 4.6 billion years B. 13 billion years C. 100,000 years D. 20 billion years
A ballerina spins initially at 1.5 rev/s when her arms are extended. She then draws in her arms to her body and her moment of inertia becomes 0.88 kg ? m2, and her angular speed increases to 4.0 rev/s. What was her initial moment of inertia?
What will be an ideal response?
The hydrogen lines in spectral type A stars
a. are most narrow for supergiants. b. are most narrow for main-sequence stars. c. can not be used to estimate the luminosity of the star. d. are very weak and difficult to see. e. are useful in determining the apparent magnitude of the star.