Amachine works for an exponentially distributed time with rate μ and then fails. a repair crew checks the machine at times distributed according to a poisson process with rate λ; if the machine is found to have failed, then it is immediately replaced. find the expected time between replacements of machines.

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

An electromagnet is a device in which moving electric chargers in a coil of wire create a magnet.whats one advantage of using electromagnetic in devices

What characteristics of hv2112 make it the best candidate to be classified as a thorne-zytkow object?