Solar power is commonly used to produce
A) heat.
B) electricity.
C) both of these
Answer: C
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What will be an ideal response?
Equilibrium: A 15-kg child is sitting on a playground teeter-totter, 1.5 m from the pivot. What is the minimum distance, on the other side of the pivot, such that a 220-N force will make the child lift off the ground?
A. 1.0 m B. 1.5 m C. 0.10 m D. 9.8 m E. 2.4 m
Your pet hamster sits on a record player that has constant angular speed. If the hamster moves to a point twice as far from the center, then its linear speed
A) doubles. B) halves. C) remains the same.
Ptolemy tried to describe the motion of the planets by devising a small circle, called a(n) ____, which rotated around the edge of a larger circle
a. epicycle b. foci c. deferent d. equant e. sphere