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

Physics & Space Science

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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

Physics & Space Science

Would N be higher or lower in an elliptical galaxy? Explain

What will be an ideal response?

Physics & Space Science

Are sand dunes stationary or do they move and migrate?

What will be an ideal response?

Physics & Space Science

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

Physics & Space Science