A very light ideal spring stretches by when it is used to hang a 135-N object
What is the weight of a piece of electronic equipment that would stretch the spring by if you hung the equipment using the spring?
A) 289 N
B) 63 N
C) 176 N
D) 405 N
A
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LIGO can detect strong gravitational waves as they pass by because they cause the L-shaped arms of the detector to
A) contract and expand by different amounts. B) become alternately more and less massive. C) experience gravitational time dilation. D) vibrate enough so that the vibrations can be measured with a seismograph.
Astronomers believe that the reason some quasars seem to have nearby companions with very similar properties is that quasars are often binary systems.
Answer the following statement true (T) or false (F)
Chromium-55 (54.9408 u) emits an electron leaving a daughter nucleus of manganese-55 (54.9380 u). How much energy is released in this reaction? (1 u = 931.5 MeV/c2)
a. 2.61 MeV c. 5.59 MeV b. 0.70 MeV d. 1.40 MeV
The half life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is
a. 35 years b. 70 years c. 125 years d. 140 years e. none of the above