A barge weighing 29.5 tons has the dimensions of 65’ x 30’ x 14’. Safety restric

Question

A barge weighing 29.5 tons has the dimensions of 65’ x 30’ x 14’.  Safety restrictions require that the freeboard is at least 1.5’, meaning that the depth should only be (14-1.5 = 12.5’).  What is the maximum weight that the barge can hold, without going over the restriction?

1,000 tons

525 tons

731 tons

875 tons

8 points   

QUESTION 3

A centrifugal pump discharges 500 GPM through a 12-inch diameter impeller.  The fluid leaves the impeller with a tangential velocity of 12 ft/sec.  If water, @ 68°F, enters the impeller via radial flow (I.E. no whirl), and the inner radius and thickness of the impeller are 2-inches.  (Assume a constant thickness of the impeller) and if the pump speed is 1275 rpm, with a head loss of 2.5-feet.  What is the Torque on the shaft?

13 # ft

27 # ft

18 # ft

6 # ft

38 # ft

6 points   

QUESTION 4

What is the headloss for a 12-inch diameter pipe that is 5,750 feet long made of plastic (CHW = 140 or f = .0151) carrying a flow rate of 3,000 GPM?

42 feet

67 feet

98 feet

111 feet

1,000 tons

525 tons

731 tons

875 tons

Explanation / Answer

Cross sectional area of barge A = 65*30 = 1950 ft2

The barge sinks to 12.5ft

Volume submerged = Volume of water displaced = 1950 * 12.5 = 24375 ft3

Denstity of water d = 28.316 kg/ft3

mass of liquid displaced = Volume of liquid displaced * d = 24375 * 28.316 = 690202.5 kg = 761 ton

Mass supported = 761-29.5 = 731 ton

Rest of the questions, please post as separate questions.

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