The Hubble time is
a. the time it takes a galaxy moving at 1000 km/sec to move 1 Mpc.
b. the time it takes the galaxy to double its size.
c. the time since recombination occurred.
d. the time remaining before the universe stops expanding and begins to contract.
e. an estimate of the age of the universe based on the Hubble constant.
E
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Physical Pendulum: A thin hoop is supported in a vertical plane by a nail. What should the radius of the hoop be in order for it to have a period of oscillation of 1.00 s? The moment of inertia of a hoop of mass M and radius R about a point on its rim is 2MR2.
A. 0.0154 m B. 0.0621 m C. 0.124 m D. 0.1876 m E. 0.248 m
Explain how we can estimate the geological age of a planetary surface from its number of impact craters.
Fill in the blank(s) with the appropriate word(s).
Some type of solar eclipse will happen about:
A) every month at new moon. B) every week at full moon. C) every month at full moon. D) about every six months at new moon. E) every year at new moon.
For a body emitting blackbody radiation, the total power emitted is proportional to the 4th power of the body's absolute temperature: (T in kelvins) and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to: ( in meters, T in kelvins) Assume an object is emitting blackbody radiation. If the Kelvin
temperature of a body is doubled, the wavelength of the most intense light is ____________ the wavelength originally of the most intense light. a. 1/16th b. half c. the same as d. 2 times e. 16 times