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
B
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A vertical outside wall of a building receives 400 W/m^2 of direct solar radiation and transfers 50 W/m^2 heat uniformly by convection to the surrounding air at 10ºC. Determine (a) vertical distance up where turbulent flow begins and (b) the wall surface temperature at this location.
What will be an ideal response?
Ammonia is mixed with water in a ratio of 1 part ammonia to 4 parts water (by volume) and used as a cleaning agent for floors. Estimate the evaporation rate of the ammonia per unit area if the process occurs at 25ºC. Assume air is moving over the surface at 5 m/s.
What will be an ideal response?
When dishes remain on a table when you yank the tablecloth beneath them, you're demonstrating
A) friction. B) inertia. C) constant motion. D) ?F = 0.
Which of the following are characteristics of a mass in simple harmonic motion? I. The motion repeats at regular intervals. II. The motion is sinusoidal. III. The restoring force is proportional to the displacement from equilibrium
A) I and II only B) I and III only C) II and III only D) all of the above E) none of the above