A torque acting on an object tends to produce
A) equilibrium.
B) rotation.
C) linear motion.
D) velocity.
E) a center of gravity.
Answer: B
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Parallel-Plate Capacitor: A battery charges a parallel-plate capacitor fully and then is removed. The plates are then slowly pulled apart. What happens to the potential difference between the plates as they are being separated?
A. It increases. B. It decreases. C. It remains constant. D. It cannot be determined from the information given.
How does Jupiter's core compare to Earth?
A) It is the same size and mass. B) It is about 10 times larger both in size and mass. C) It is about 10 times larger in size and the same mass. D) It is about the same size but is 10 times more massive. E) Jupiter doesn't have a core—it is made entirely from hydrogen and helium.
In science, the difference between a measured value and its true value referred to as
A) a deviation B) bias C) an error D) an uncertainty
A machine gun is attached to a railroad flatcar that rolls with negligible friction. If the railroad car has a mass of 6.35 × 10^4 kg, how many bullets of mass 35.0 g would have to be fired at 200 m/s off the back to give the railroad car a forward velocity of 0.56 m/s?
a. 5.1E–4 b. 2.0E+3 c. 6.5E+5 d. 5.1E+3 e. 6.5E+4