The arrival rate for a certain waiting-line system obeys a poisson distribution with a mean of 0.5 unit per period. it is required that the probability of one or more units in the system not exceed 0.20. what is the minimum service rate that must be provided if the service duration is to be distributed exponentially?

Four 5-gram blocks of metal are sitting out in the sun and absorb the same amount of heat energy. use the following specific heat capacity data to determine which block will increase its temperature the most.

Atoms in a molecule are bonded together by sharing gaining or losing_

An electron and a proton are held on an x axis, with the electron at x = + 1.000 m and the proton at x = - 1.000 m. part a how much work is required to bring an additional electron from infinity to the origin? express your answer with the appropriate units. part b if, instead of the second electron coming in from infinity, it is initially at x = + 20.00 m on the axis and is given an initial velocity of 100.0 m/s toward the origin, does it reach the origin? part c how close to the origin does it come?