What does Hubble's law tell us?
A) The longer the period of a Cepheid variable, the greater its luminosity.
B) The more distant a galaxy, the faster it is moving away from us.
C) The faster a spiral galaxy's rotation speed, the more luminous it is.
D) For every force, there is an equal and opposite reaction force.
B
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What produces the lunar phases?
a. The rotation of the Moon b. The revolution of the Moon c. The changing direction of sunlight d. Earth's tilted axis relative to the Moon e. The changing direction of Earth to the Moon
Explain how observations of white-dwarf supernovae provide information on the expansion of the universe when it was younger
What will be an ideal response?
Repeatedly tap the side of a drinking glass with a spoon as you fill the glass with water and the pitch of the sound
A) increases. B) decreases. C) remains relatively constant.
The temperature on an Oswego, New York "warm" spring day has a maximum of 64°F and a minimum of 30°F. What is the number of heating degree days?
a. 18 b.30 c. 34 d. 47 e. 64