# Practice Worksheet- Density and Pressure by rth57429

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```									Practice Worksheet- Density and Pressure

1. What is the density of a substance that has a mass of 3.55 kg if it is a cylinder
with a radius of 15.0 cm and a height of 85.0 cm?
2. What is the density of a substance which has a weight of 12.50 pounds and is a
rectangular box with dimensions 12.0 cm x 15.0 cm x 25.0 cm?
3. If a substance has a density of 6,341 kg/m3, what would the mass of a sphere of
4. What pressure is exerted on the ground by a cow who weighs 425 pounds if each
hoof has a radius of 5.50 cm? Assume each hoof to be perfectly circular.
5. What pressure would be exerted if that cow was put on skis which were 180.0 cm
long and 5.50 cm wide? Assume the cow only uses one ski for every two hoofs.
6. BY what factor is the pressure on a person exerted by one nail, with a nail head
area of 0.00025 m2 as compared to 10,000 nails of the same area if the person
weighs 150.0 pounds?
7. I put a force of 25.0 N on my brakes to stop my car. The brake pedal has an area
of 2.5 cm by 3.5 cm. If the force required to stop the car is 12,000 N, what must
the area of my brake pads be?
8. The force required to lift a car is 25,500 N. If the cylinder lifting the car has a
radius of 4.50 meters, what force must be exerted on a cylinder of radius .350
meters to lift the car?

Practice Worksheet- Density and Pressure

1. What is the density of a substance that has a mass of 3.55 kg if it is a cylinder
with a radius of 15.0 cm and a height of 85.0 cm?
2. What is the density of a substance which has a weight of 12.50 pounds and is a
rectangular box with dimensions 12.0 cm x 15.0 cm x 25.0 cm?
3. If a substance has a density of 6,341 kg/m3, what would the mass of a sphere of
4. What pressure is exerted on the ground by a cow who weighs 425 pounds if each
hoof has a radius of 5.50 cm? Assume each hoof to be perfectly circular.
5. What pressure would be exerted if that cow was put on skis which were 180.0 cm
long and 5.50 cm wide? Assume the cow only uses one ski for every two hoofs.
6. BY what factor is the pressure on a person exerted by one nail, with a nail head
area of 0.00025 m2 as compared to 10,000 nails of the same area if the person
weighs 150.0 pounds?
7. I put a force of 25.0 N on my brakes to stop my car. The brake pedal has an area
of 2.5 cm by 3.5 cm. If the force required to stop the car is 12,000 N, what must
the area of my brake pads be?
8. The force required to lift a car is 25,500 N. If the cylinder lifting the car has a
radius of 4.50 meters, what force must be exerted on a cylinder of radius .350
meters to lift the car?

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