A solar eclipse that occurs when the moon's umbra reaches Earth's surface is called
a. a total solar eclipse.
b. a partial solar eclipse.
c. an annular solar eclipse.
d. a penumbral solar eclipse.
e. an umbral solar eclipse.
A
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What is the gravitational force on a 20-kg satellite circling the Earth (radius = 6.4 × 10^6 m, mass = 6.0 × 10^24 kg) with a period of 5.0 h?
a. 88 N b. 55 N c. 36 N d. 98 N e. 18 N
Are solar cell efficiencies of over 30% realizable under realistic use conditions (include cost in these conditions)? Explain
What will be an ideal response?
Which of these statements is true?
a. Aristotle believed that the speed at which objects fall depends on their weight (and he was right). b. Aristotle believed that the speed at which objects fall depends on the medium they fall through (and he was wrong). c. Aristotle believed that a falling object was not trying to reach a goal. d. Aristotle believed that the speed at which objects fall depends on both their weight and the medium they fall through (and he was partly right). e. Aristotle believed that how fast objects fall depends on both their weight and their surrounding medium (and he was right).