What force drives the planets along their orbits?
a. magnetism
b. no force is needed to drive them along their orbits
c. gravity
d. solar wind
Answer: b. no force is needed to drive them along their orbits
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Convection in the outer layers of a star like the Sun helps mixing and makes more hydrogen available for burning.
Answer the following statement true (T) or false (F)
Jennifer hits a stationary 200. gram ball and it leaves the racket at 40. m/s. If time lapse photography shows that the ball was in contact with the racket for 40. ms:
(a) What average force was exerted on the racket? (b) What is the ratio of this force to the weight of the ball?
Coefficient of performance is
A) 1 - Qcold/Qhot. B) Q/m. C) Qout/Win. D) Q - W. E) 1 - Tcold/Thot.
An organ pipe closed at one end and open at the other end has two successive harmonics with frequencies of 2170 Hz and 2790 Hz. What is the fundamental frequency of the pipe?
What will be an ideal response?