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MC Q’s

MC Q’s. In a large tank of liquid, the hydrostatic pressure at a given depth is a function of: a. depth b . surface area c . liquid density d. object density e. a and c f . a and d

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MC Q’s

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  1. MC Q’s • In a large tank of liquid, the hydrostatic pressure at a given depth is a function of: a. depth b. surface area c. liquid density d. object density e. a and c f. a and d • Dams at two different locations are needed to form a lake. When the lake is filled, the water level will be at the top of both dams. The Dam #2 is twice as high and twice as wide as Dam #1. How much greater is the force of the water on Dam #2 than the force on Dam #1? (Ignore atmospheric pressure; it is pushing on both sides of the dams.) a. 2 b. 4 c. 8 d. 16 e. 32

  2. MC Q’s ANSWERS • In a large tank of liquid, the hydrostatic pressure at a given depth is a function of: a. depth b. surface area c. liquid density d. object density e. a and c f. a and d • Dams at two different locations are needed to form a lake. When the lake is filled, the water level will be at the top of both dams. The Dam #2 is twice as high and twice as wide as Dam #1. How much greater is the force of the water on Dam #2 than the force on Dam #1? (Ignore atmospheric pressure; it is pushing on both sides of the dams.) a. 2 b. 4 c. 8 d. 16 e. 32

  3. MC Q’s ANSWERS • In a large tank of liquid, the hydrostatic pressure at a given depth is a function of: a. depth b. surface area c. liquid density d. object density e. a and c f. a and d • Dams at two different locations are needed to form a lake. When the lake is filled, the water level will be at the top of both dams. The Dam #2 is twice as high and twice as wide as Dam #1. How much greater is the force of the water on Dam #2 than the force on Dam #1? (Ignore atmospheric pressure; it is pushing on both sides of the dams.) a. 2 b. 4 c. 8 d. 16 e. 32

  4. MC Q’s • A large stone is resting on the bottom of the swimming pool. The normal force of the bottom of the pool on the stone is equal to the: • weight of the stone. • weight of the water displaced. • sum of the weight of the stone and the weight of the displaced water. • difference between the weight of the stone and the weight of the displaced water. • weight of the water in the swimming pool. • A heavily loaded boat is floating in a pond. The boat starts to sink because of a leak but quick action plugging the leak stops the boat from going under although it is now deeper in the water. What happens to the surface level of the pond? a. It stays the same. b. It goes up. c. It goes down. d. More information is needed

  5. MC Q’s ANSWERS • A large stone is resting on the bottom of the swimming pool. The normal force of the bottom of the pool on the stone is equal to the: • weight of the stone. • weight of the water displaced. • sum of the weight of the stone and the weight of the displaced water. • difference between the weight of the stone and the weight of the displaced water. • weight of the water in the swimming pool. • A heavily loaded boat is floating in a pond. The boat starts to sink because of a leak but quick action plugging the leak stops the boat from going under although it is now deeper in the water. What happens to the surface level of the pond? a. It stays the same. b. It goes up. c. It goes down. d. More information is needed

  6. MC Q’s ANSWERS • A large stone is resting on the bottom of the swimming pool. The normal force of the bottom of the pool on the stone is equal to the: • weight of the stone. • weight of the water displaced. • sum of the weight of the stone and the weight of the displaced water. • difference between the weight of the stone and the weight of the displaced water. • weight of the water in the swimming pool. • A heavily loaded boat is floating in a pond. The boat starts to sink because of a leak but quick action plugging the leak stops the boat from going under although it is now deeper in the water. What happens to the surface level of the pond? a. It stays the same. b. It goes up. c. It goes down. d. More information is needed

  7. Q5 • Calculate the absolute pressure at an ocean depth of 1000 m. Assume that the density of water is 1000 kg/m3 and that Po= 1.01 x 105 Pa (N/m2). • Calculate the total force exerted on the outside of a 30.0 cm diameter circular submarine window at this depth.

  8. Q5 Answer • Calculate the absolute pressure at an ocean depth of 1000 m. Assume that the density of water is 1000 kg/m3 and that Po= 1.01 x 105 Pa (N/m2). • Calculate the total force exerted on the outside of a 30.0 cm diameter circular submarine window at this depth. 9.9x106 N/m2 2.80 x 106 N

  9. Q6 A bargain hunter purchases a "gold" crown at a flea market. After she gets home, she hangs it from a scale and finds its weight in air to be 7.84 N. She then weighs the crown while it is immersed in water (density of water is 1000 kg/m3) and now the scale reads 6.86 N. Is the crown made of pure gold if the density of gold is 19.3 x 103 kg/m3? (Density of gold = 19,300 kg/m3)

  10. Q6 Answer A bargain hunter purchases a "gold" crown at a flea market. After she gets home, she hangs it from a scale and finds its weight in air to be 7.84 N. She then weighs the crown while it is immersed in water (density of water is 1000 kg/m3) and now the scale reads 6.86 N. Is the crown made of pure gold if the density of gold is 19.3 x 103 kg/m3? (Density of gold = 19,300 kg/m3) 0.98 N 0.0001 m3 0.0001 m3 0.80 kg 8000 kg/m3

  11. Q7 It was determined that a 400N input force could lift a 4000N weight on the other side (i.e. that with the greater area). • If the amount of input force does not increase, how can it lift a greater weight? If anything, the fact that the force is spread over a larger area on the output side suggests the overall pressure exerted on that side would decrease. • Where does that extra force come from?

  12. Q7 Answer • If the amount of input force does not increase, how can it lift a greater weight? Pressure is a measure of Force/Area, if the area increases the Force increases • Where does that extra force come from?

  13. Q7 Answer • If the amount of input force does not increase, how can it lift a greater weight? Pressure is a measure of Force/Area, if the area increases the Force increases • Where does that extra force come from? In order to lift the second lever even a short distance, the first lever must be cover a large distance (see diagram to the right) Win = Wout

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