What would you see if you were on the Moon during a solar eclipse?
What will be an ideal response?
During a solar eclipse, you would see a small circular shadow traveling across a portion of Earth's surface.
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A mass m = 4.0 kg is connected, as shown, by a light cord to a mass M = 6.0 kg, which slides on a smooth horizontal surface. The pulley rotates about a frictionless axle and has a radius R = 0.12 m and a rotatinal inertia I = 0.090 kg?m2. The cord does not slip on the pulley. What is the magnitude of the acceleration of m?
?
?
A. ?2.4 m/s2 B. ?2.8 m/s2 C. ?3.2 m/s2 D. ?4.2 m/s2 E. ?1.7 m/s2
Which of the following objects do you expect to find at the center of a planetary nebula?
A. neutron star B. planet C. black hole D. white dwarf
_________________ have the highest electrical conductivity at room temperature.
(a) Metals (b) Semiconductors (c) Insulators (d) Superconductors
Fusion reactions happen at a slower rate in bigger stars than in smaller ones.
a. true b. false