Calculate the power needed to overcome skin friction
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.
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A man can row a boat at a speed of 6.00 km/h in still water. if he is crossing a river where the current is 3.00 km/h in what direction should his boat be headed if he wants to reach a point directly opposite his starting point?
An elevator, having a weight of 500 lb, needs to be lifted a distance y = 20ft, starting from rest and then stopping after at t=6 sec. A single motor and cable-winding can be mounted anywhere and used for the operation.
A plate produces a diffraction pattern with a central bright maximum, and minima at 3, 6, and 9 cm from the center of this maximum. Is this a double-slit plate or a single-slit plate?
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 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.
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?
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.
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