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

Physics & Space Science

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An important factor in producing and controlling a fission chain reaction is the fact that _________ neutrons are much better a causing fission in uranium-235

Fill in the blank(s) with correct word

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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

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Are solar cell efficiencies of over 30% realizable under realistic use conditions (include cost in these conditions)? Explain

What will be an ideal response?

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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).

Physics & Space Science