When the Sun shines on the Moon, the Moon casts a shadow
A) at all times.
B) that is tapered.
C) that sometimes falls on Earth.
D) all of the above
Answer: D
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A 1.86-kg block is held in place against the spring by a 81-N horizontal external force (see the figure). The external force is removed, and the block is projected with a velocity v1 = 1.2 m/s upon separation from the spring
The block descends a ramp and has a velocity at the bottom. The track is frictionless between points A and B. The block enters a rough section at B, extending to E. The coefficient of kinetic friction over this section is 0.28. The velocity of the block is v3 = 1.4 m/s at C. The block moves on to D, where it stops. The height h of the ramp is closest to A) 11 B) 7.3 C) 15 D) 17 E) 18
Would N be higher or lower in an elliptical galaxy? Explain
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Are sand dunes stationary or do they move and migrate?
What will be an ideal response?
Where would you least expect to find an ionization nebula?
A) in the galactic disk B) near a hot, young star C) in a spiral arm D) in the halo of our galaxy