For the following potential distribution, use the gradient equation to find E. V = r2sin Φ(V)

Select one:
a. -2.ρ.sinΦ.aρ - ρ.cosΦ.aΦ
b. None of these
c. -2.sinΦ.aρ - ρ.cosΦ.aΦ
d. -2.ρ.sinΦ.aρ - cosΦ.aΦ
fastt plz im running out of time

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above

What is the heat treatment of metals? what is the benefit of it? why and how it's useful? answer in details, do not write by hand.