A runner in a race takes 2.7 seconds to go from the 40 meter mark to the 70 meter mark. (a) What is the runner's speed? (b) How far would the runner go in 8 seconds if this speed is maintained? (c) How long did it take the runner to cover the first 40 m (assuming the same speed was maintained)?
1 m/s, 9 m, 3.6 s
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If you found absorption from _________ in the spectrum of a planet, you could conclude that it might contain some form of life.
a. oxygen b. methane c. water vapor d. oxygen, methane, or water vapor
In what way does our theory of nuclear fusion predict that the Sun should be different today than it was when fusion began about 4-1/2 billion years ago?
A) The Sun's mass should be about 30% higher today. B) The Sun's mass should be about 30% lower today. C) The Sun's luminosity should be about 30% higher today. D) The Sun's radius should be about 30% higher today. E) The Sun's distance from Earth should be about 30% lower today.
When a load is placed on a properly arched structure, compression
A) weakens the structure. B) strengthens the structure. C) neither of these
How do we know that pulsars must be neutron stars?
A) Pulsars have the same upper mass limit as neutron stars do. B) No massive object, other than a neutron star, could spin as fast as we observe pulsars to spin and remain intact. C) This is only a theory that has not yet been confirmed by observations. D) We have observed massive-star supernovae produce pulsars. E) Telescopic images of pulsars and neutron stars look exactly the same.