In a sequence of sedimentary rocks, the bottom layer is the youngest and the top layer is the oldest. This type of sequence suggests that the
A) principles of original horizontality and superposition are flawed.
B) beds must have been overturned by some structural disturbance.
C) dates for these rocks must be in error.
D) principles of original horizontality and superposition hold true.
Answer: B
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A star is moving toward Earth at 90% the speed of light. The star emits light, which moves away from the star at the speed of light. What do Earth-based astronomers measure for the speed of this light?
A) c B) 1.9c C) 1.2c D) 0.98c E) 0.95c
Faraday's Law: A flat coil having 160 turns, each with an area of 0.20 m2, is placed with the plane of its area perpendicular to a magnetic field of 0.40 T. The magnetic field changes uniformly from 0.40 T in the +x direction to 0.40 T in the -x direction in 2.0 s. If the resistance of the coil is 16 ?, at what rate is power generated in the coil during this change?
A. 5.0 W B. 10 W C. 15 W D. 20 W
When we see x-rays from an accretion disk in a binary system, we can't immediately tell whether the accretion disk surrounds a neutron star or a black hole. Suppose we then observe each of the following phenomena in this system. Which one would rule out the possibility of a black hole?
A) intense x-ray bursts B) spectral lines from the companion star that alternately shift to shorter and longer wavelengths C) visible and ultraviolet light from the companion star D) bright x-ray emission that varies on a time scale of a few hours
If you drop a ball in the absence of air resistance, it accelerates downward at 9.8 m/s2. If instead you throw the ball upward, then its downward acceleration after release is
A. equal to 9.8 m/s2. B. greater than 9.8 m/s2. C. less than 9.8 m/s2.