On a planet whose Moon is in the same orbital plane as the planet's orbit around itsstar, how often will solar eclipses occur?
a) Twice every orbit of its moon (twice a month).
b) Once every orbit of the planet around its Sun (its year).
c) Twice every rotation of the planet (twice a day).
d) Once every orbit of its moon (its month).
e) Once every rotation of the planet (its day).
Answer: d) Once every orbit of its moon (its month).
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The event horizon
a. is believed to be a singularity. b. is a crystalline layer. c. has a radius equal to the Schwarzschild radius. d. marks the inner boundary of a planetary nebula. e. is located at the point where synchrotron radiation is created around a pulsar.
In the inductor of a 59-Hz AC series circuit, the peak voltage precedes the peak current in each cycle by what time interval?
a. 1.7E–2 s b. 4.2E–3 s c. 8.5E–3 s d. 3.4E–2 s e. 6.8E–2 s
Light takes about 8 minutes to travel from the sun to Earth and about 40 minutes to travel from the sun to Jupiter. Jupiter is about ____________________ AU from the sun
Fill in the blank(s) with correct word
The value for the total energy that reaches each square meter of Earth from the Sun each second is called the ______________
Fill in the blank(s) with correct word