1. Would the mass density of an object be the same if the object were on the moon rather than on the earth? Would the weight density be the same?
2. A steel column in a building has a cross-sectional area of 3500 cm2 and supports a weight of 2.5 x 105 N. Find the stress on the column.
3. Each vertical steel column of an office building supports a weight of 1.30 x 105 N and is compressed to 5.90 x 10-3 cm.
a. Find the compression in each column if a weight of 5.50 x 105 N is supported.
b. If the compression of each steel column is 0.0710 cm, what weight is supported by each column?
4. The specific gravity of an unknown substance is 0.80. Will it float on or sink in gasoline?
5. In a deep dive, a whale is appreciably compressed by the pressure of the surrounding water. What happens to the whale's density?
6. Would it be slightly more difficult to draw soda through a straw at sea level than on top of a very high mountain? Explain.
7. When a steadily flowing gas flows from a larger diameter pipe to a smaller diameter pipe, what happens to the following:
a. Its speed
b. Its pressure
c. The spacing between its streamlines
8. The large piston in a hydraulic lift has a radius of 250 cm2
. What force must be applied to the small piston with a radius of 25 cm2 in order to raise a car of mass 1500 kg?
9. Water flows through a 13.0 cm diameter fire hose at a rate of 4.53 m/s.
a. What is the rate of flow through the hose in L/min?
b. How many liters pass through the hose in 25.0 min?
10. Suppose you cut a small gap in a metal ring. If you heat the ring, will the gap become wider or narrower?
11. The temperature of a 1 m long aluminum rod is 20°C. If the temperature is increased to 70°C what is the length of the rod if the coefficient of linear expansion for aluminum is 2.3*10-5 /° C.