What do moonquakes reveal about the Moon?
A) It has a strong magnetic field generated by a large molten core.
B) It has a differentiated core, displaced away from us by the Moon's rotation.
C) Its small, partially molten core has been pulled toward us by tidal forces.
D) The Moon has been geologically dead throughout its entire history.
E) The Moon is quite active, almost as much so as Jupiter's moon Io.
C
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Indicate whether the statement is true or false
A 1200 kg car is traveling at 4.00 m/s and strikes a wall. The 1200 kg car bounces off the wall with a velocity of 4.00 m/s. If the contact with the wall by the car lasts for 0.100 seconds, then the impulse on the car is
A. 12,400 kg m/s. B. 10,200 kg m/s. C. 9,600 kg m/s. D. 8,400 kg m/s. E. 2,900 kg m/s.
What is the zeroth law of thermodynamics?
a. Energy is always conserved in thermodynamic processes. b. Momentum is always conserved. c. The pressure of a fluid decreases as its velocity increases. d. If two objects are in thermal equilibrium with a third object, they are in thermal equilibrium with each other. e. If a = c and b = c, then a = b.
How do we know that pulsars must be very small in size (radius)?
A) We have measured their radii directly in high-resolution telescope images. B) Their small sizes are inferred from careful study of their spectra. C) Some spin so rapidly that if they were larger in size, their surfaces would be moving faster than the speed of light. D) Only very small objects can beam radiation into space. E) This is only a theory that has not yet been confirmed by observations.