Components: When rolled down a mountainside at 7.0 m/s, the horizontal component of its velocity vector was 1.8 m/s. What was the angle of the mountain surface above the horizontal?
A. 75°
B. 57°
C. 33°
D. 15°
Answer: A
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A lunar eclipse that occurs when the moon moves completely into Earth's umbral shadow is called
a. a total solar eclipse. b. a partial solar eclipse. c. an annular solar eclipse. d. a penumbral lunar eclipse. e. an umbral lunar eclipse.
Two blocks connected by a string are pulled across a horizontal surface by a force applied to one of the blocks, as shown. The coefficient of kinetic friction between the blocks and the surface is 0.25. If each block has an acceleration of 2.0 m/s2 to the right, what is the magnitude F of the applied force?
?
?
A. 25 N B. 18 N C. 11 N D. 14 N E. 7.0 N
For finding the distances to globular clusters, Harlow Shapley used
A) RR Lyrae variables. B) planetary nebulae. C) eclipsing binaries. D) Population I classical Cepheids. E) Type I supernovae.
A 10-cm focal length converging lens is used to magnify small newspaper print 2.0 mm high. Calculate the height of the image (in mm) for the maximum magnification for a normal eye
a. 3.5 b. 7.0 c. 9.2 d. 12 e. 2.5