Question 1 (10)
A pirate in a movie is carrying a chest (0.30 m × 0.30 m × 0.20 m) that is supposed to be filled with gold. To see how ridiculous this is, determine the mass of the gold. The mass density of gold is 19300 kg/m3. To judge how large this is by converting to lbs., using the fact that 1 kg has a weight of 2.2 lbs.
Question 2 (10)
Find a) the hydrostatic pressure exerted on an object that is 4.45 m below the surface of gasoline and b) its absolute pressure. The density of gasoline is 680 kg/m3.
Question 3 (6)
The tires of a 15700 N automobile are inflated to a pressure of 172000 Pa (25 psi). Assuming that each tire supports 1⁄4 of the weight of the car, calculate the area of contact between a tire and the road.
Question 4 (6)
In a hydraulic press, the area of the small piston is 25.0 cm2 and the area of the large piston is 325 cm2. If a force of 75.0 N is exerted on the small piston, find the weight of the object that can be lifted by the large piston.
Question 5 (1)
Three blocks labeled A, B, and C are floating in water as shown in the drawing. Blocks A and B have the same mass and volume. Block C has the same volume, but is submerged to a greater depth than the other two blocks. Which one of the following statements concerning this situation is false?
(a) The buoyant force acting on block A is equal to that
acting on block B.
(b) The buoyant force acting on block C is greater than that acting on block B.
(c) The volume of water displaced by block A is greater than that displaced by block B. (d) The volume of water displaced by block C is greater than that displaced by block B.
Question 6 (5)
A piece of metal displaces 3.56×10-5 m3 of water. Find the buoyant force.
Question 7 (7)
Water flows through a pipe of diameter 8.0 cm with a speed of 10.0 m/s. Find the fluid flow in m3/s.
Question 8 (6)
Water flows through a pipe with an area of 13 in2 with a speed of 12 ft/s. It then enters a smaller pipe with an area of 3.1 in2. What is the speed of the water as it flows through the smaller pipe?
Question 9 (1)
For an incompressible fluid, the speed of the fluid is: a) Smaller for the smaller parts of the pipe.
b) Greater for the smaller parts of the pipe.
c) Constant throughout the pipe.
Question 10 (4)
In the video shown in class a small ball was able to stay at the top of funnel even though air was being blown out the funnel. Using Bernoulli’s principle, explain why. See the diagram to the right.
Question 11 (2)
Can a bowling ball float in water? Back up your answer.