How small an object can a scanning tunneling microscope "see?"
a. about the size of a mushroom spore
b. about the size of a living cell
c. as small as a single atom
d. as small as the nucleus of an atom
c
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A baseball catcher throws a ball vertically upward and catches it in the same spot when it returns to his mitt. At what point in the ball's path does it experience zero velocity and non-zero acceleration at the same time?
a. midway on the way up b. at the top of its trajectory c. the instant it leaves the catcher's hand d. the instant before it arrives in the catcher's mitt
A ball with original momentum +2.0 kgm/s hits a wall and bounces straight back without losing any kinetic energy. The change in momentum of the ball is:
a. 0. c. 4.0 kgm/s. b. -4.0 kgm/s. d. -8.0 kgm/s.
Imagine hitting a heavy anvil with a hammer. The hammer is in contact with the metal for a short period of time. How do you suppose the time of contact depends upon how hard you hit the anvil (i.e
, does a hard hit remain in contact much longer or shorter than a light tap?) [It is reasonable to assume Hooke's law of elasticity to hold.]
Three Mile Island and Chernobyl were not the only nuclear accidents in the last six decades. Were there any worse accidents (answer for both Three Mile Island and Chernobyl)?
What will be an ideal response?