Why have more people seen a lunar eclipse than an solar eclipse?
a. Eclipses of the Sun are much rarer than eclipses of the Moon.
b. The shadow of the Moon is larger than the shadow of Earth.
c. Anyone on the night side of Earth can see a total eclipse of the Moon.
d. Anyone on the day side of Earth can see a total solar eclipse.
Ans: c. Anyone on the night side of Earth can see a total eclipse of the Moon.
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An empty floating boat interacts gravitationally with the earth. A different interaction with something else keeps the boat from responding to the gravitational interaction by sinking. What is the other object that interacts with the boat?
A. The water B. The atmosphere C. The earth D. The lake floor E. Other (specify)
An iceberg breaks off from a glacier on the shore of the ocean with a loud cracking sound. the air. A person on a ship hears the sound in the water 4.0 s before hearing the sound in the air. How far away is the ship? The ambient temperature is –5.0°C. The speed of sound in saltwater is 1 530 m/s
a. 5 700 m b. 1 700 m c. 1 100 m d. 380 m
How much heat is necessary to change 20 g of water at 100°C into steam at 100°C?
a. 0.16 kcal b. 10800 kcal c. 10.8 kcal d. 1.6 kcal
An ideal transformer is one that:
a. has an output frequency of 60 Hz. c. experiences no power loss. b. has a turn ratio, N2/N1, equal to 1. d. works with direct current.