Which of the following is the name given to a situation in which one fission reaction instigates exactly one more fission reaction?

a. a critical mass
b. a runaway chain reaction.
c. a controlled chain reaction.
d. a generation.

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An electric current in a wire will push or pull on a permanent magnet. which statement best explains how an electric current creates an electromagnetic force on another magnet?

Consider a one meter long horizontal pipe with a constant 100 cm^2 cross sectional area. water flows rightward into the pipe at x = 0 with flow velocity 02m/sec at every point within the pipe intake area. at x=1, the rightward flow rate is 0.192 m/sec. assume the water is a conserved quantity in the pipe, so there must be a leak (a sink) somewhere in the pipe. 1. compute net volumetric flow of the source if the system to be in equilibrium. 2. now assume the pipe in the problem has no leaks. compute the net volumetric rate of change for the system.

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?