A 60.0-kg person rides in elevator while standing on a scale. The elevator is traveling downward but slowing down at a rate of 2.00 m/s2. The reading on the scale is closest to
A) 589 N.
B) 708 N.
C) 469 N.
D) 120 N.
E) 349 N.
Answer: B
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The resultant moment vector MR at point O in Problem 2.2 is (in N?m)
(A) 12j 1 18k (B) 215i 1 12k (C) 18j 1 12k (D) 212i 1 18j
If the initial interstellar cloud in star formation has a mass sufficient to form hundreds of stars, how does a single star form from it?
A) One star forms at its center and blows the rest of the matter back into space. B) The cloud fragments into smaller clouds and forms many stars at one time. C) One star forms and the rest of the matter goes into making planets, moons, and other objects of a solar system. D) The cloud is disrupted by rotation so that it reduces its mass down to that of a typical star. E) A supernova blows the cloud up and dissipates the majority of the gas.
What information do we know about the known exoplanets?
A) estimates of orbits and masses B) complete composition C) precise masses D) All of the above E) None of the above
A parallel plate capacitor is charged to voltage V and then disconnected from the battery. Leopold says that the voltage will decrease if the plates are pulled apart. Gerhardt says that the voltage will remain the same. Which one, if either, is correct, and why?
a. Gerhardt, because the maximum voltage is determined by the battery. b. Gerhardt, because the charge per unit area on the plates does not change. c. Leopold, because charge is transferred from one plate to the other when the plates are separated. d. Leopold, because the force each plate exerts on the other decreases when the plates are pulled apart. e. Neither, because the voltage increases when the plates are pulled apart.