Why are astronomers interested in detecting neutrinos from the Sun?
A. Neutrinos help in predicting the occurrence of solar flares.
B. Neutrinos can reveal the Sun's inner magnetic field.
C. Neutrinos give information about the nuclear reactions in the Sun's core.
D. Neutrinos allow the prediction of the sunspot cycle.
Answer: C
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General Questions: A person who normally weighs 700 N is riding in an elevator that is moving upward but slowing down at a steady rate. If this person is standing on a bathroom scale inside the elevator, what would the scale read?
A. more than 700 N B. less than 700 N C. 700 N D. It could be more or less than 700 N, depending on whether the magnitude of the acceleration is greater than or less than 9.8 m/s2.
Radioactive Decay: The number of radioactive nuclei in a particular sample decreases to one-eighth of its original number in 9 days. What is the half-life of these nuclei?
A. 9/8 days B. 2 days C. 3 days D. 8 days E. 10 days
About what percentage of Hubble Deep Field (HDF) galaxies do astronomers find are irregular?
A: 5%. B: 25%. C: 50%. D: 70%. E: 90%.
A wheel starts from rest and rotates with a constant angular acceleration about a fixed axis. It completes the first revolution 6.0 s after it started. How long after it started will the wheel complete the second revolution?
A. 9.9 s B. 7.8 s C. 8.5 s D. 9.2 s E. 6.4 s