Density of states of a free electron gas (a) calculate the density of states of a three-dimensional free electron gas dg(e) at zero temperature (b) using a computer program: plot the density of states dg (e) at zero temperature and at finite temperature, i. e. do(e) ffd(e, t) (c) calculate the density of states at the fermi energy, i. e. do(ef) (at t 0 k) (d) calculate the mean value of the energy of the electronic system (at t 0 k) ef 1 e 2dc (e) de (e)t=0k =

An insurance company wants to know if the average speed at which men drive cars is higher than that of women drivers. the company took a random sample of 27 cars driven by men on a highway and found the mean speed to be 72 miles per hour with a standard deviation of 2.2 miles per hour. another sample of 18 cars driven by women on the same highway gave a mean speed of 68 miles per hour with a standard deviation of 2.5 miles per hour. assume that the speeds at which all men and all women drive cars on this highway are both approximately normally distributed with unknown and unequal population standard deviations.

Looking at this barometer, is the air pressure high or low? what type of weather would you expect? high, bad low, bad high, good low, good

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2.