Distribution of the sum of independent
The distribution of the sum of independent N(?, ?2) random variables is:
a. always approximately normal
b. always exactly normal
c. usually approximately normal
d. usually exactly normal e. sometimes approximately normal
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McDonalds Waiting Times. You want to estimate SD for the population of waiting times at McDonald's drive up windows. You want to be 95% confident that the sample SD is within 20% of SD. Find the minimum sample size. Is this sample size practical?
Find the maximum thermal efficiency of this heat engine (62.1%). Determine whether this engine can produce its desired power output (no).
Two parallel, infinite, nonconducting plates are 10.6 cm apart and have charge distributions of +2.5 µC/m2 and -2.5 µC/m2. What is the force on an electron in the space between the plates? (The charge of an electron is 1.602 10-19 C.)
Write down the pdf for each of the following distributions, then sketch the distributions on the axes provided (be sure to indicate which is which). a) N(2,9), b) N(0,1)
A round casting is 0.1 m in diameter and .5 m in length. What is the difference in the solidification time of the two castings?
A total of 3.02 x 106 electrons are placed on an initially uncharged wire of length 1.45 m. (a) What is the magnitude of the electric field a perpendicular distance of 0.436 m away from the midpoint of the wire?
The heat exchanger effectiveness is 75%. Use a heating value for kerosene of 45,840 kJ/kg. What is the engine specific fuel consumption?
Consider a harmonic oscialltor of mass m under a restoring force -kx and damping force -bx. It is displaced at +A and then released with zero velocity. Find the equation representing the underdamped, critically damped, and overdamped motions.
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