Observing star clusters will give astronomers needed data for stellar evolution because all the stars are the same age
a. True
b. False
Indicate whether the statement is true or false
True
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Centripetal force does no work on a circularly-moving object because
A) no change in energy occurs. B) rotational energy transfers to kinetic energy. C) centripetal force has no component in the direction of motion. D) none of the above.
A projectile is launched vertically upward at 50 m/s. If air resistance does affect motion, then its speed upon returning to its starting point is
A) less than 50 m/s. B) 50 m/s. C) more than 50 m/s.
Why is it important that the James Webb Space Telescope will be operating in the infrared?
A) It will allow us to study the highly redshifted light of distant galaxies, enabling us to observe them as they first formed in the early universe. B) The infrared is not easily visible from Earth's surface. C) It will allow us to be closer to the most distant galaxies, so we get better pictures. D) It will allow us to see into other universes that are not visible from Earth's surface.
On June 21, the noonday Sun is overhead at what latitude?
a. 0° b. 23.5°N c. 23.5°S d. That of the Tropic of Cancer