Water at 20°C is transported in a 10-cm-diameter cast iron horizontal pipe at a flow rate of 0.02 m^3/s. The pressure drop over 100 m of the pipe is nearest:
(A) 97 kPa
(B) 84 kPa
(C) 62 kPa
(D) 51 kPa
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What makes a star stop contracting?
A. The dust in it gets packed so tightly that it cannot continue to contract. B. Its gravity gets too strong for it to continue contracting. C. It gets hot enough that its pressure builds up, pushing back against the force of gravity. D. Its magnetic field pushes back against the force of gravity. E. It gets cool enough that it freezes, and the resulting ice is hard enough to push back against gravity.
A sunken steel ship has a mass of 500,000 kg. It is filled with water. In order to lift the ship, air bags are to be inflated inside the hull. What volume of air is needed if 7.8 is the specific gravity of steel?
A) 1266 m3 B) 436 m3 C) 872 m3 D) 225 m3 E) 2778 m3
Spherical particles of density 1.8 g/cm3 are shaken in a container of water (viscosity = 1.0 × 10^?3 N/s/m3). The water is 9.0 cm deep and is allowed to stand for 30 minutes. What is the radius of the largest particles still in suspension at that time?
a. 2.5E–6 m b. 6.4E–6 m c. 5.4E–6 m d. 1.8E–6 m e. 4.1E–6 m
What do we mean by uniform linear motion?