A friend says that the heavyweight champion of the world cannot exert a force of 50 N on a piece of tissue paper with his best punch. The tissue paper is held in midair, no tricks. You
A) agree that it can't be done.
B) have reservations about this assertion.
C) disagree, for a good punch easily delivers this much force.
Answer: A
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When we use an analogy that represents the expanding universe with the surface of an expanding balloon, what does the inside of the balloon represent?
A) The inside of the balloon does not represent any part of our universe. B) the center of the universe C) the entire universe D) regions of the universe beyond the Milky Way Galaxy
In general, which of the following is usually the weakest bond?
A) ionic bond B) van der Waals bond C) covalent bond D) hydrogen bond
As a body falls through air starting from rest, its acceleration
a. is zero. b. stays constant. c. continuously decreases. d. continuously increases. e. gets smaller and smaller, eventually approaching zero.
A 100 kg mass is blown apart into a 60 kg piece and a 40 kg piece. After the blast, the two masses are moving apart with a relative velocity of 60 m/s. The velocity of the 60 kg mass is
A. 88 m/s. B. 67 m/s. C. 51 m/s. D. 40 m/s. E. 24 m/s.