Ch. 13 Test

A gymnast standing on one hand (area 0.02 m2) pushes down on the ground with a force of 600N. How much pressure does the gymnast exert on the ground?

• 1200 Pa
• 12 Pa
• 30,000 Pa
• 3000 Pa

The SI unit for pressure, equal to 1 N/m2, is called the

• atmosphere.
• foot-pound.
• pascal.
• watt.

The pressure exerted by a stationary fluid is determined by

• the area of surface containing the fluid and the type of fluid.
• the weight and volume of the fluid.
• the type of fluid and its depth.
• the shape of the container and the weight of the fluid.

Which of the following statements about fluid pressure is false?

• Pressure increases as depth increases.
• The pressure at a given depth is constant.
• The pressure in a fluid is exerted downward.
• Liquids and gases exert pressure.

Why do mountain climbers on very high peaks need cylinders of oxygen as they approach the summit?

• Air pressure at high altitudes is too great for normal breathing.
• Air on the mountaintops is too cold to breathe.
• The pressure of air decreases as altitude increases.
• The tops of the mountains extend out of the atmosphere.

A water balloon can explode if squeezed tightly between two hands. Just prior to exploding, at what point of the balloon is the pressure exerted by the water greatest?

• The pressure exerted by the water is the same at all points of the balloon.
• It’s greatest at the points of contact between the balloon and the two hands.
• It’s greatest at the bottom of the balloon (point nearest the ground).
• It’s greatest at the top of the balloon (point furthest from the ground).

A 5-N input force of a hydraulic system corresponds to a 40-N output force. If the area of the small piston is 11 cm², what is the area of the large piston?

• 8 cm
• 255 cm
• 2200 cm2
• 88 cm2

True or False? According to Bernoulli's principle, as the speed of a moving fluid increases, the pressure within the fluid increases. True or False?

• True
• False

According to Archimedes’ principle, the buoyant force acting on an object is equal to

• the weight of the object
• the pressure exerted at the bottom of the fluid.
• the weight of the fluid displaced by the object.
• the pressure exerted by the fluid at the point of contact with the object.

How much fluid is displaced by an object that is floating, partially submerged, in a fluid?

• a volume of fluid equal to the volume of the object
• a volume of fluid equal to the volume of the submerged part of the object
• a mass of fluid equal to the mass of the object
• a mass of fluid equal to the mass of the submerged part of the object