Two masses are connected by a cord that passes over a pulley as shown in the figure. The pulley and the cord have negligible mass and 
(6.0 kg) moves on a horizontal surface with a coefficient of friction of 0.5, 
(2.0 kg) is suspended vertically. What is the acceleration of 
?
A. 0.0 
B. 3.0
C. 1.0
D. 2.9
A. 0.0
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The circular shape of the Earth's shadow on the Moon during a lunar eclipse suggested to the Greeks that the Earth was
A) cylindrical in shape B) at the center of the Universe C) flat D) spherical in shape
Hans Geiger
A) invented the bubble chamber. B) discovered radium and polonium. C) invented the particle detector tube. D) observed back-scattering from nuclei. E) discovered radioactivity.
On average, the highest amounts of precipitation occur in this zone.
A star has an hour angle of +4 hours. What can you conclude?
A) The star remains above your horizon for only 4 hours each day. B) The star crossed your meridian 4 hours ago. C) The star remains below your horizon for only 4 hours each day. D) The star crosses your meridian at 4 a.m. each day. E) The star crosses your meridian at 8 p.m. each day.