Which of the following particles is considered not elementary?
A. the electron
B. the electron antineutrino
C. the neutron
D. the muon
E. the tau
C. the neutron
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A 30-mF capacitor is charged to 40 V and then connected across an initially uncharged 20-mF capacitor. What is the final potential difference across the 30-mF capacitor?
a. 15 V b. 24 V c. 18 V d. 21 V e. 40 V
Your weight is
A) another word for your mass. B) the gravitational attraction between you and Earth. C) a property of mechanical equilibrium. D) the same in all locations.
Simple harmonic motion
A. occurs when there are no forces on the system B. requires a constant force C. requires a force which is not constant, but varies directly with position D. requires a force which is not constant, but varies inversely with position
About what percentage of Hubble Deep Field (HDF) galaxies do astronomers find are irregular?
A: 5%. B: 25%. C: 50%. D: 70%. E: 90%.