Two meters of water is equivalent to how many millimeters of mercury?
(A) 422 mm
(B) 375 mm
(C) 231 mm
(D) 147 mm
A U-tube manometer measures the pressure in an air pipe to be 10 cm of water. The pressure in the pipe is nearest
(A) 843 Pa
(B) 981 Pa
(C) 1270 Pa
(D) 1430 Pa
A submersible has a viewing window that is 60 cm in diameter. Determine the pressure force of the water on the window if the center of the window is 30 m below the surface and the horizontal window.
(A) 65.8 kN
(B) 79.3 kN
(C) 83.2 kN
(D) 99.1 kN
A 3-m-high, open cubical tank is filled with water. One end acts as a gate and has a hinge at the very bottom. What force at the very top of the gate is needed to just hold the gate shut?
(A) 44.1 kN
(B) 38.2 kN
(C) 23.9 kN
(D) 20.1 kN
A body weighs 200 N in air and 125 N when submerged in water. Its specific weight is nearest
(A) 2.31
(B) 2.49
(C) 2.54
(D) 2.67
A 1.4-m-high, 4.2-m-long enclosed tank is filled with water and accelerated horizontally at 6 m/s2. If the top of the tank has a small slit across the front, the maximum pressure in the tank is nearest
(A) 38.9 kPa
(B) 45.8 kPa
(C) 59.7 kPa
(D) 66.7 kPa
The force on the rear of the 80-cm-wide tank (the vertical end) of Prob. 8 is nearest
(A) 108 kN
(B) 95 kN
(C) 79 kN
(D) 56 kN
8. Atest tube is placed in a rotating device that gradually positions the tube to a horizontal position. If the rate is 1000 rpm, estimate the pressure atthe bottom of the relatively small-diameter test tube. The 12-cm-long tube contains water and the top of the tube is at a radius of 4 cm from the axisor
(A) 723 kPa
(B) 658 kPa
(C) 697 kPa
(D) 767 kPa
A drinking fountain has a 2-mm-diameter outlet. If the water is to be laminar, what is the maximum speed that the water should have?
(A) 0.5 m/s
(B) 1 m/s
(C) 2 m/s
(D) 4 m/s
A pitot probe measures 10 cm of water on a small airplane flying where the temperature is 20°C. The speed of the airplane is nearest
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