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Fluids Review

Fluids Review. Which of the following is a fluid at room temperature?. helium wood iron gold. Which of the following statements is NOT correct?. A fluid flows. A fluid has a definite shape. Molecules of a fluid are free to move past each other. A fluid changes its shape easily.

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Fluids Review

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  1. Fluids Review

  2. Which of the following is a fluid at room temperature? • helium • wood • iron • gold

  3. Which of the following statements is NOT correct? • A fluid flows. • A fluid has a definite shape. • Molecules of a fluid are free to move past each other. • A fluid changes its shape easily.

  4. Because a buoyant force acts in the opposite direction of gravity, • objects submerged in water have a net force smaller than their weight. • objects submerged in water have a net force larger than their weight. • objects submerged in water have a net force equal to their weight. • objects submerged in water appear to weigh more than they do in air.

  5. Which of the following statements about completely submerged objects resting on the ocean bottom is correct? • The buoyant force acting on the object is equal to the object’s weight. • The buoyant force is greater than the weight of the object. • The displaced volume of fluid is greater than the volume of the object. • The weight of the displaced fluid is the same as the buoyant force.

  6. At 20.0° C, steel has a density of 7.80 g/ cm3. A 100. gram piece of steel would occupy ____ cubic centimeters of space. • 0.078 • 12.8 • 128 • 780

  7. An object that is sinking, must have a buoyant force that is: • Greater than the weight of the object • Greater than the apparent weight of the object • Equal to the weight of the object • Less than the weight of the object

  8. What does Archimedes' principle state? • The buoyant force acting on an object is equal to the weight of the fluid displaced by the object. • The buoyant force acting on an object is equal to the volume of the fluid displaced by the object. • The buoyant force acting on an object decreases if the volume of the object increases. • The buoyant force acting on an object decreases if the object is placed in a denser liquid.

  9. Which of the following is always true? • Buoyant force = Weight of the object • Volume of submerged object = Volume of displaced fluid • Buoyant force is in the same direction as the weight of the object • Mass of submerged object = Mass of displaced fluid

  10. Which of the following is not always true? • Buoyant force = Weight of the displaced fluid • Buoyant force = Weight of the object • If object is floating, the apparent weight is 0. • Any object in a fluid has an apparent weight less than its actual weight.

  11. A municipal water supply is provided by a tall water tower. Water from this tower flows to a building. How does the water flow out of a faucet on the ground floor of a building compare with the water flow out of an identical faucet on the second floor of the building? • Water flows more rapidly out of the ground-floor faucet. • Water flows more rapidly out of the second-floor faucet. • Water flows at the same speed out of both faucets. • The speed of the water flow cannot be determined unless the height of the water tower is known.

  12. Two paper cups are hung by strings 10 cm apart. If a person blows between the cups, • they move toward each other. • they move away from each other. • they do not move. • they move upward.

  13. In a large tank of liquid, the gauge pressure at a given depth is a function of: • depth. • surface area. • liquid density. • Choices a and c are both valid.

  14. A force exists between two regions of fluid if … • There is high pressure in both • There is low pressure in both • There is a pressure difference

  15. An ideal fluid is all of the following except • Laminar flow • Viscous • Incompressible • A gas or a liquid

  16. If blood flows from a smaller to a larger artery in a closed system, the velocity will • Increase • Decrease • Stay the same

  17. If the fluid speed increases, what will happen to the pressure? • Increases • Decreases • nothing

  18. Pascal’s principle is the guiding principle behind • Machines that use hydraulic fluids • The fact that metal boats can float • All machines that increase mechanical advantage

  19. In hydraulic brakes, the area of the piston connected to the brake pedal is ______ than the area of the piston connected to the brake pads. • Less than • More than • The same as

  20. In a closed system, the flow rate of a larger pipe is ________ the flow rate smaller diameter pipe. • More than • Less than • The same as

  21. If a semi truck drives past you and creates a fast flow of air, your car will • Move toward the truck • Move away from the truck • Continue along the same path

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