Compared to our Sun, a typical white dwarf has
A) about the same mass and density.
B) about the same mass and a million times higher density.
C) a larger mass and a 100 times lower density.
D) a smaller mass and half the density.
E) a smaller mass and twice the density.
B
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How much energy is radiated each second by one square meter of a star whose temperature is 10,000 K? Note: ? in the Stefan-Boltzmann law is equal to 
.
a.
5.67 × 1012 J
b.
5.67 × 108 J
c.
5.67 × 104 J
d.
300 nm
e.
300,000,000 nm
Energy and Momentum: An egg falls from a bird's nest in a tree and feels no effects due to the air. As it falls,
A. only its kinetic energy is conserved. B. only its momentum is conserved. C. both its kinetic energy and its momentum are conserved. D. only its mechanical energy is conserved. E. both its mechanical energy and its momentum are conserved.
Asteroids ________.
A. are about the same size as planets, but have not pulled themselves into a spherical shape B. are small bodies, typically the size of a grain of sand or a boulder C. are larger objects, a few hundred kilometers in size, but not quite large enough to be classified as a planet D. can range in size from a few meters to many hundreds of kilometers
A stone is thrown at an angle of 30° above the horizontal from the top edge of a cliff with an initial speed of 8.0 m/s. A stop watch measures the stone's trajectory time from top of cliff to bottom to be 5.9 s. How far out from the cliff's edge does the stone travel horizontally? (g = 9.8 m/s2 and air resistance is negligible)
a. 41 m b. 27 m c. 300 m d. 130 m