Mars experiences a sequence of seasons similar to Earth's. Why?
A. Mars's axial tilt is almost the same as Earth's.
B. Mars's distance from the Sun is about the same as Earth's.
C. Mars has polar ice caps, much like Earth's.
D. Mars experiences gravitational forces from its moons, just as Earth does.
Answer: A
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A white dwarf that exceeds the Chandresekhar limit ____
a. will collapse to form a neutron star b. will explode as a nova, and may repeat the cycle over time c. is completely destroyed by carbon deflagration d. breaks apart and forms an excretion disk e. becomes a degenerate object
A 40.0 cm long organ pipe is filled with air and is open at both ends. The velocity of sound in air at 0
is 331 m/s. What is the frequency of the fundamental mode?
A. 297 Hz B. 314 Hz C. 373 Hz D. 385 Hz E. 414 Hz
Which of the following worlds could an astronaut visit without the need for a spacesuit (and survive)?
A) Mercury B) Venus C) The Moon D) Mars E) None of the above; an astronaut would need a spacesuit to survive a visit to any world in the solar system (aside from Earth).
A 3.0-kg object moving 8.0 m/s in the positive x direction has a one-dimensional elastic collision with an object (mass = M) initially at rest. After the collision the object of unknown mass has a velocity of 6.0 m/s in the positive x direction. What is M?
a. 7.5 kg b. 5.0 kg c. 6.0 kg d. 4.2 kg e. 8.0 kg