A fireman is sliding down a fire pole. As he speeds up, he tightens his grip on the pole, thus increasing the vertical frictional force that the pole exerts on the fireman
When the force exerted on his hands equals the force that Earth exerts on him, what happens to the fireman? A) The fireman comes to a stop.
B) The fireman descends with slower and slower speed.
C) The fireman descends with a smaller but non-zero acceleration.
D) The fireman continues to descend, but with constant speed.
E) The acceleration of the fireman is now upward.
D
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In an SEM, the crystallographic orientation of the surface is determined by the diffraction of
(a) Secondary electrons (b) Emitted x-rays (c) Backscattered electrons (d) The primary electron beam
For a specific element, photons of how many different energies could be emitted by electrons in the n = 6 level as they return to the n = 1 level?
a. 15 b. 21 c. 6 d. 1
General Questions: If you pound a feather with a hammer, which one feels a greater force?
A. always the feather B. always the hammer C. The size of the force is always exactly the same on both of them. D. If the feather moves, then it felt the greater force. Otherwise the force was the same on both.
It makes little difference in making a prediction whether a linear or an exponential growth in some quantity is assumed
What will be an ideal response?