Aplant manager is concerned her equipment may need recalibrating. it seems that the actual weight of the 15 oz. cereal boxes it fills has been fluctuating. the standard deviation should be at most 0.5 oz. in order to determine if the machine needs to be recalibrated, 88 randomly selected boxes of cereal from the next day's production were weighed. the standard deviation of the 88 boxes was 0.52. does the machine need to be recalibrated? conduct a hypothesis test at the 5% level.

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length

Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux

Acompressor compresses a gas, a pump compresses a liquid. for a given pressure ratio, why does it take more work to compress a gas in a compressor than a liquid in a pump? a)- for a given pressure ratio the average specific volume for a gas is much higher than the average specific volume for a liquid. b)- there is no difference. the only difference is the amount of heat generated (not work) c)- for a given pressure ratio the average volurge for a gas is much higher than the average volume for a liquid. d)-there is no difference