To help Kim practice for the Special Olympics, Sally runs beside him for half the required distance. She runs the remaining distance at her regular speed and arrives 90 seconds ahead of Kim. What is the ratio of Sally's regular speed to Kim's speed? Use tKim for Kim's total time.
A.
B.
C.
D.
E.
Answer: C
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Which of the following extrasolar planets would be easiest to detect using the Doppler shift method?
A) a massive planet far from its parent star B) a low mass planet far from its parent star C) a low mass planet close to its parent star D) a massive planet close to its parent star
When we measure the mass of a planet using the Doppler shift method, we know that it is mass
A) could well be smaller B) could be larger or smaller C) is exactly as measured D) could well be larger
Consider an X-ray binary system in which a compact object, surrounded by an accretion disk, is in a binary orbit with another star. All of the following statements about such accretion disks are true except:
A) The radiation from an accretion disk may vary rapidly in time. B) The compact object may be either a neutron star or a black hole. C) X-rays are emitted by the hot gas in the accretion disk. D) Several examples of flattened accretion disks being "fed" by a large companion star can be seen clearly in photos from the Hubble Space Telescope. E) The accretion disk consists of material that spills off the companion star.
When two bulbs are connected in series to a battery, the electric resistance that the battery senses is
A) greater than the resistance of either bulb. B) less than the resistance of either bulb. C) none of the above