The differences between nuclear reactors and nuclear bombs include which of the following?
Check all that apply.
A. Chain reactions occur only in nuclear bombs.
B. Nuclear bombs are runaway fission reactions and reactors aren't.
c. Nuclear reactors produce exactly one additional fission for each
fission reaction while nuclear bombs don't.
D. Nuclear reactors have critical mass while nuclear bombs don't.

The dot diagram represents the motion of the motorcycle as it moves from left to right

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?