On a Hertzsprung-Russell diagram, where would you find stars that are cool and dim?
A) upper right B) lower right C) upper left D) lower left
B
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Most of Earth's fresh water is in
a. the atmosphere. b. lakes and rivers. c. glacial ice sheets. d. aquifers.
For a point mass equal to that of the Sun, how far does the Schwarzschild radius extend from its center?
a. A few kilometers away b. A few solar radii away c. A few astronomical units (AU) away d. A few parsecs away
Why do we think that DNA was probably NOT the first self-replicating molecule?
A) it is able to replicate using carbohydrates rather than proteins B) it is far to complex to have been the first self-replicating molecule C) it is able to replicate at high temperatures found near deep ocean vents D) laboratory have shown that it is able to catalyze its own replication
The end of the cutting cord on a gas-powered weed cutter is 0.21 m in length. If the motor rotates at the rate of 20 rev/s, what is the tangential speed of the end of the cord?
a. 13 m/s b. 4.2 m/s c. 26 m/s d. 2.7 m/s