I know enough about the reactor to know that not all of the A fed to the reactor will react. I also know that, of the A that does react, 1/3 will react by the first reaction, and 2/3 will react by the second reaction. If the concentration of N in the outlet stream is 1/3 (0.3333) and the fractional conversion of A is 0.8 (by both reactions), calculate the molar fraction of A in the feed stream.

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.

This is the number of complete movements of a wave per second.