A book rests on a table, and the table rests on the ground. Which of the following pairs of forces forms a force pair, or action-reaction pair, obeying Newton's law of force pairs?
A) Gravity pulling down on the table and the book pushing down on the table.
B) The ground pushing up on the table and the book pushing down on the table.
C) The table pushing up on the book and the book pushing down on the table.
D) Gravity pulling down on the book and the book pushing down on the table.
E) Gravity pulling down on the book and the table pushing up on the book.
C
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A conical pendulum is constructed with a string 2.00 m in length. The pendulum is set in horizontal circular path the vertical axis. If the angle the string makes with the vertical axis is 45.0 degrees, then the angular velocity of the conical pendulum is
A. 4.00 rad/s. B. 3.55 rad/s. C. 3.04 rad/s. D. 2.63 rad/s. E. 2.01 rad/s.
All waves have in common a
A) pattern. B) vibrating source. C) variable regions of high and low pressure. D) none of the above
In a visual binary system with circular orbits, if in 20 years the two stars' position angles have shifted by 30 degrees, the pair's period must be:
A) 60 years. B) 90 years. C) 120 years. D) 240 years. E) 360 years.
Collectively, electrons, muons, and neutrinos are called:
A) hadrons. B) baryons. C) photons. D) leptons. E) pions.