Physics
1500: Energy and Matter
Fall
2009
We
will have an Exam covering the material through chapter 12 on Nov. 10 or Nov.
17. Bring a Scantron
882E.
Assignment for Chapter 13 Fluids: Turn in the Questions Below on Tuesday, November 17.
·
Begin
reading chapter 13 by Tuesday, November 3.
1. If a 0.5m3 volume of aluminum weighing 13,500N is submerged in water, what volume of water does it displace?
2. If a 1 L (1L =10-3m3) container is one half submerged in water
a) How much water does it displace?
b) What is the buoyant force on the container?
3. A 400 ton fishing boat is floating in water.
a) What is the weight of water it displaces?
b) What is the buoyant force on the boat?
4. A 0.001m3 block of aluminum is placed in a container of water that was filled to the brim; so that water overflows when the aluminum is put in the container. The same thing is done in another container with a 0.001m3 block of lead. Does the lead displace more, less or the same amount of water as the aluminum?
5. A 1kg block of aluminum is placed in a container of water that was filled to the brim, so that water overflows when the aluminum is put in the container. The same thing is done in another container with a 1kg block of lead. Does the lead displace more, less or the same amount of water as the aluminum?
6. The depth of water behind a dam is 150m. What is the water pressure at the base of the dam? (Neglect the air pressure, i.e. I want the gage pressure.)
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7. Given the hydraulic system at the right, what should the area of the left cylinder be to support the 100N Force, F2, on the right one if the Force on the left on is 400N? The area of the right cylinder is 0.02m2. |
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8. A 4kg block of metal displaces 0.001m3 of water when it is submerged. What is its density?
9. A 5kg rock weighs 50N in
air and has an apparent weight of 40N when submerged. How much liquid did it displace?
Assignment for Chapter 14 Gasses: Turn in the Questions below on Thursday, Nov. 19.
·
Begin
reading chapter 14 on gasses by Thursday, November 5
1. What is the cause of atmospheric pressure?
2. What happens to the pressure inside a balloon when it is squeezed to half its volume at a constant temperature?
3. A balloon that weighs 2N floats in the air, moving neither up nor down.
a) What buoyant force acts on it?
b) What happens if the buoyant force increases?
c) What happens if the buoyant force decreases?
4. What happens to the internal pressure in a fluid flowing in a horizontal pipe when its speed increases?
5. It is sometimes said that a gas fills all the space available to it. Why doesn’t the gas in our atmosphere go off into space?
6. A balloon full of air starts out at the bottom of a lake. As it rises what happens (i.e. do they increase, decrease or stay the same) to its
a) Mass
b) Volume
c) Density
7. Explain how a suction cup works, i.e. why does it stick to the wall?
8. The air pressure in our classroom is 100,000N/m2. What force does it exerts a force on a window of area 2m2? (1 ton is about 10,000N.)
9. If this force is pushing the window out, why doesn’t the window “blow out”?
·
Begin reading chapter 15 on
Temperature & Heat by Tuesday, Nov. 17.