An eclipse season is the period of time during which the
a. Moon crosses a node in its orbit.
b. Sun crosses a node in the Moon's orbit.
c. line of nodes crosses the Moon's orbit.
d. Moon is new or full.
e. Moon is visible during the day.
b
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Impulse: A force of 5.3 N is needed to hold on to an umbrella in a strong wind. If the air molecules each have a mass of 4.7 × 10-26 kg, and each one strikes the umbrella (without rebounding) with a speed of 2.0 m/s in the same direction, how many atoms strike the umbrella each second? Assume that the wind blows horizontally so that the gravity can be neglected.
What will be an ideal response?
Folded rock layers that resemble a trough are called
a. anticlines. b. inclines. c. synclines. d. paraclines.
Weight and g: A spherically symmetric planet has four times the earth's mass and twice its radius. If a jar of peanut butter weighs 12 N on the surface of the Earth, how much would it weigh on the surface of this planet?
A. 3.0 N B. 6.0 N C. 12 N D. 24 N E. 36 N
The amount of light from an incandescent lamp that is transmitted through an ideal Polaroid filter is half, and through a classroom Polaroid filter is
A) less than half. B) more than half. C) half.