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1. A rigid vessel contains 5 kg of saturated liquid water and 0.5 kg of saturated vapor at 10 kPa. What amount of heat must be transferred to the system to evaporate all the liquid?
2. Consider the cooling of a glass of tap water by the addition of ice. The glass contains 400 ml of tap water at room temperature, to which 100 gm of ice is added. Assume the glass is adiabatic and that thermal equilibrium is obtained. The ice is originally at 210°C when removed from the freezer and put in the glass. For ice, Dhfus 5 26.0 3kJ/mol 4.
(a) What is the final temperature?
(b) What % of the cooling is achieved by latent heat (the melting of ice)?
sketch a histogram showing the population distribution - locate value of the population mean in your sketch and make an estimate of the standard deviation.
the madison cosmetics company has developed a new womens facial cleanser that they believe is superior to those
A survey of magazine subscribers showed that 55.8% rented a car during the last 12 months for business reasons, 44% rented a car for personal reasons, and 25% rented a car for both business and personal reasons.
Given the following three-equations system, explain why this is not a simultaneous-equations model and Could OLS be used to estimate each equation of this system? Why?
he standard deviation of the sample proprortion is 5.3%. How large a sample (to the nearest person) would be required to reduce this standard deviation to 3.7%?
in a large american university in 1969 the male and female professors were sample independently yielding the following
What decision should be made regarding the null hypothesis?
How would one determine which combination of variables is the best (with statistical significance)? If that's not possible, can we show that one combination is statistically significantly worse than the others? What method would be used?
Three-month period actually exceeds 1.5 days. Would it be reasonable to conclude that the mean amount of unpaid time lost has increased above the previously estimated 1.0 days? Explain.
determine whether the distribution is a discrete probability distributionxnbspnbsp
An airline tracks data on its flight arrivals. Over the past six months, 65 flights on one route arrived early, 273 arrived on time, 218 were late, and 44 were cancelled.
q1. show that for a sample of n 39 the smallest and largest z values are - 1.96 and 1.96 and the middle i.e. 20th z
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