5.2 Pressure

A 72 kg person lies on their bed and covers an area of 1.65 m². How much pressure is the person exerting on the mattress?

• The person is exerting 1003 Pa of pressure on the mattress.

• The person is exerting 309 Pa of pressure on the mattress.

• The person is exerting 746 Pa of pressure on the mattress.

• The person is exerting approximately 428 Pa of pressure on the mattress.

• The person is exerting 550 Pa of pressure on the mattress.

A 198 kg statue is on display in a museum. How much area should its base cover such that it exerts 746 Pa of pressure on the ground?

• 1.7 m²

• 2.6 m²

• 3.5 m²

• 4.2 m²

• 4.3 m²

Which of the following uses water pressure to function?

• Baking soda mixed with vinegar

• Bicycle tire pump

• Fire hydrant

• Desk lamp plugged into outlet

• Old-fashioned clock

In a water jet cutting process, a stream of water with a speed of 189 m/s drills a circular hole with a radius of 3.4 cm with a force of 137 N. This process lasts for 22 s. Calculate the pressure of the water on the metal in kPa.

• About 61 kPa

• About 57 kPa

• About 28 kPa

• About 20 kPa

• About 38 kPa

In a water jet cutting process, a stream of water with a speed of 189 m/s drills a hole with a radius of 3.4 cm with a force of 137 N. This process lasts for 22 s. Calculate the volume flow rate.

• The volume flow rate is 0.34 m³/s.

• The volume flow rate is 0.82 m³/s.

• The volume flow rate is 5.6 m³/s.

• The volume flow rate is 0.69 m³/s.

• The volume flow rate is 10 m³/s.

In a water jet cutting process, a stream of water with a speed of 189 m/s drills a hole with a radius of 3.4 cm with a force of 137 N. This process lasts for 22 s. Calculate the total volume of water used.

• The total volume of water used is 5.6 cubic meters.

• The total volume of water used is 67 cubic meters.

• The total volume of water used is 3.4 cubic meters.

• The total volume of water used is 2.3 cubic meters.

• The total volume of water used is 15 cubic meters.

Why do we experience the greatest amount of atmospheric pressure near the surface of the Earth compared to higher up?

• Because the air is warmer near the surface
• Due to the gravitational pull of the moon
• Due to the weight of the air above pushing down near the surface of the Earth.
• As a result of increased humidity levels

Select all true statements about using a straw to drink a beverage.

• There is atmospheric pressure pushing down on the surface of the drink.

• Drinking from the straw reduces atmospheric pressure inside the straw.

• Drinking from the straw increases atmospheric pressure inside the straw.

• Drinking from the straw decreases atmospheric pressure around the outside of the beverage.

• A higher atmospheric pressure on the surface of the drink pushes liquid into the lower pressure area in the straw.