Pressure

The pressure is .............................. Pa.

The area is .............................. m².

A ballet dancer who has a weight of 480 N stands on her toes during a performance with 25 cm² in contact with the floor. The pressure exerted by the dance on the floor is .............................. Pa.

The four tyres of a car are inflated to a gauge pressure of 200 kPa. Each tyre has an area of 0.015 m² in contact with the road. The weight of the car is .............................. N.

A swimming pool is 2.5 m deep. The density of water in the swimming pool is 1000 kg/m³. [Take g = 10 N/kg] The pressure at the bottom of the pool is .............................. Pa.

In order to receive an intravenous injection of medication, a plastic bag containing medication is hung from a height. If the average gauge pressure in the vein is 11 kPa and the density of the fluid medication is 1020 kg/m³, the minimum height h of the bag is .............................. m.

The vertical height of the mercury column above the mercury level in the trough when the tube is pulled by 10 cm is .............................. cm.

The vertical height of the mercury column above the mercury level in the trough when the tube is pushed down by 5 cm is .............................. cm.

The vertical height of the mercury column above the mercury level in the trough when the tube is tilted through an angle of about 10 ^o is .............................. cm.

A fish swims at a depth of 8.0 m below the surface of a lake. Atmospheric pressure is 1.0 x 10⁵ Pa. The density of the water is 1000 kg/m³ and the gravitational field strength g is 10 N/kg. What is the total pressure at this depth?

• 2.0 x 10⁴ Pa

• 8.0 x 10⁴ Pa

• 1.1 x 10⁵ Pa

• 1.8 x 10⁵ Pa