The Last Quarter phase of the Moon
A) rises at sunrise.
B) sets at sunrise.
C) crosses the meridian at sunrise.
D) rises at sunset.
E) sets at sunset.
C
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On average, how often do impactors about 10 km in size, large enough to produce mass extinction, hit Earth?
What will be an ideal response?
Why do some scientists say that the Moon may have been important for the evolution of human life?
A) It created the tides in the ocean, where life most likely started. B) It stabilized Earth's axis tilt and prevented large climate changes. C) Meteorites from the Moon were the seeds of life on Earth. D) It gave humans the inspiration to explore worlds beyond Earth. E) It most certainly wasn't—only lunatics would think so.
A 120-kg refrigerator, 2.00 m tall and 85.0 cm wide has its center of mass at its geometrical center. You are attempting to slide it along the floor by pushing horizontally on the side of the refrigerator
The coefficient of static friction between the floor and the refrigerator is 0.300. Depending on where you push, the refrigerator may start to tip over before it starts to slide along the floor. What is the highest distance above the floor that you can push the refrigerator so that it won't tip before it begins to slide? A) 0.710 m B) 1.00 m C) 1.21 m D) 1.42 m E) 1.63 m
You want to insert an aluminum rod, which at 20°C has a radius of 1.00020 cm into a copper tube which has a radius of 1.00010 cm at the same temperature
You decide to put both of them in the refrigerator. At what temperature will the rod just fit if both are cooled to the same temperature? The coefficient of thermal expansion for aluminum is 2.4 × 10-5K-1, and that of copper is 1.7 × 10-5K-1. A) 7.8°C B) 6.3°C C) 9.2°C D) 14.7°C E) 5.7°C