What should be the temperature of the heat source
A heat engine utilizes a heat source at 460°C and has an ideal (Carnot) efficiency of 30%. To increase the ideal efficiency to 40%, what must be the temperature of the heat source?
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What is the optimal number of cases to have on hand to minimize expected total costs in a single week? show calculations. What is the expected cost?
A flat-bottomed barge, 25 m long and 10 m wide, submerged to a depth of 1.5 m, is to be pushed up a river at a rate of 8.6 km/hr. Calculate the power needed to overcome skin friction (in kW) if the temperature of the water is 15oC.
A soccer ball is kicked at an angle of 62 degrees to the horizontal, with an initial speed of 18 m/s. Assume for the moment that we can neglect air resistance. How long is the ball in the air (in s)?
The weights of a random sample of 49 university male first-year students yielded a mean of 165 pounds and a standard deviation of 6.5 pounds. Determine a 90% confidence interval for the mean weight of all university male first-year students.
Decide whether the random variable x is discrete or continuous. x represents the total number of die rolls required for an individual to roll a five.
What percent of the sample reports not drinking?a. Are there independent and dependent variables in this case? If so, what are they? If not, why not?
A tank of propane has capacity of 120 gallons, what would the tank be rated in terms of cubic feet, cubic meters and liters? If the pressure gage shows a reading of 45psig.
A mass-spring system oscillates on a horizontal frictionless surface with an amplitude of 3.24 cm. a) If the spring constant is 234 N/m and the mass is 0.580 kg, determine the mechanical energy of the system.
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