Where is this aurora?
Answer: B
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Series/Parallel Circuits: A 9-V battery is hooked up to two resistors in series. One has a resistance of 5 ?, and the other has a resistance of 10 ?. Several locations along the circuit are marked with letters, as shown in the figure. Through which resistor is energy being dissipated at the higher rate?
A. the 10-? resistor B. the 5-? resistor C. Energy is being dissipated by both resistors at the same rate.
When liquids change to a solids, they
A) absorb energy. B) release energy. C) both of these D) neither of these
The center of our galaxy is 30,000 light years away. Could a person possibly travel there in her own lifetime?
A) No, because a person cannot travel at lightspeed. B) No, because the trip would take longer than 30,000 years, and nobody lives this long. C) No, because time dilation applies only to clocks and not to biological phenomena such as a person's lifetime. D) Yes, by traveling at nearly lightspeed, because of time dilation or the "relativity of time." E) Yes, by traveling faster than lightspeed, because of time dilation or the "relativity of time."
Suppose an object is placed 6.0 cm in front of a lens that has a focal length of 4.0 cm. Where is the image located? What are the magnification and the character of the image?