What physics principle can be demonstrated by rubbing two transparency sheets with tissue paper and then holding them near each other?
A) the electric motor
B) certain features of the frictional force
C) a new feature about the gravitational force
D) the electric force
E) the magnetic force
D
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Polyurethanes result from the reaction of a(n) _________and an isocyanate.
Fill in the blank(s) with the appropriate word(s).
Granulation is evidence that energy in the photosphere ____
a. is flowing upward b. is flowing downward towards the core c. stays horizontal on the surface d. is spiraling westward e. is spiraling eastward
Fundamental Forces: The main reason that there is a limit to the size of a stable nucleus is
A. the limited range of the gravitational force. B. the short range nature of the strong nuclear force. C. the weakness of the gravitational force. D. the weakness of the electrostatic force.
Ultramafic rocks are commonly found forming at the Earth's surface.
Indicate whether the statement is true or false.