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1.Assume the sample variances to be continuous measurements Find the probability that a random sample of 25 observations, froma normal population with variance ?2=6 will have avariance s^2
a) greater than 9.1
b) between 3.462 and 10.745.
2.A bolt located 50 mm fm he center of an automobile wheel is tightened by applying the couple shown for 0.10 s. Assuming that the wheel is free to rotate and is initially at rest, determine the resulting angular velocity of the wheel. The wheel has a mass of 19 kg and has a radius of gyration of 250 mm.
Calculate the time average F of the total force tangent to the toad exerted on the tires during the 8 s. Treat the car as a particle and neglect air resistance.
an insulated tank is evacuated. Air from the atmosphere at 12 psia and 70 degrees farenheight is allowed to flow into the 100 cubic foot tank. What is the final temp and the final mass of air in the tank just after flow ceases.
A canal cut in rock (n= 0.030 is trapezoidal in section with the bottom width of 6.10m and side slopes of 1 on 1. The allowable average velocity is 0.76 m/s. What slope will produce 5.66 m^3/s
The plate OAB forms an equilateral triangle which rotates counterclockwise with increasing speed about point O. If the normal and tangential components of acceleration of the centroid C
calculate the amplitude F0 of the sinusoidal excitation force that is necessary to produce a steady-state vibration with a velocity amplitude of 10 m/s at resonance. what is the corresponding amplitude of the acceleration
the 70 m tall tower is supported by three cables that exert forces fab fac and fad on it. the magnitude of the force
A $325,000 bond has an interest rate of 8.4% but if the bond experiences an inflation rate of 8.6% what will be the profit be after 4 years
In an irrigation system sometimes water must be pumped over long distances. Consider a system that consistes of a 1 m diameter, 2 km long commercial steel pipe, which connects a river to an irrigation canal.
A rectangular concrete channel 4m wide on a slope of 0.002 is designed to carry water(T = 10 C) at discharge rate 25m^3/s. Estimate the uniform flow depth for these conditions?
An April 2009 survey of 2253 American adults conducted by the Pew Research Center's Internet & American Life Project revealed that 1262 of the respondents had at some point used wireless means for online access.
in a hydrometer test , the results are as follows:Gs =2.60 , temperature of water=24c ,and R=43at 60 min after the start of sedimentation . what is the diameter , D, of the smallest -size particles
on five-cycle semilogarithmic paper plot the grain size distribution curves from the following mechanical analysis data
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