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# General

### PHYSICS

What is meant by matter? Anything that occupies space and has weight.
What are the three basic physical states in which matter can exist? Solid, liquid and gas.
What is meant by pressure? Force that acts on a unit of area.
What is the standard sea level atmospheric pressure expressed in inches of mercury, and in pounds per square inches? 29.92 inches of mercury and 14.69 pounds per square inch.
What characteristic of the atmosphere determines the speed of sound? Its temperature.
What is meant by the density of air? The weight of a given volume of air.
How much force is produced by 1,000 psi of hydraulic pressure acting on a piston whose area is 20 square inches? 20,000 pounds.
What is meant by the fulcrum of a lever? The point about which the lever rotates.
Give an example of a first-class lever, a second-class lever and a third-class lever. First-class: A screwdriver being used to pry the lid from a can of paint. Second-class: A wheelbarrow. Third-class: A hydraulically retracted landing gear
How many cubic inches of fluid is forced out of a cylinder by a piston whose area is 20 square inches when the piston moves five inches? 100 cubic inches.
What is meant by a temperature of absolute zero? The temperature at which all molecular movement stops.
What is the Celsius equivalent of a temperature of 50°F? 10°C.
What formula is used to find the amount of work done when an object is moved across a floor? Work = Force x Distance.
What determines the mechanical advantage of an arrangement of ropes and pulleys? The number of ropes that support the weight.
What determines the mechanical advantage of a gear train? The ratio between the number of teeth on the drive gear and the number of teeth on the driven gear.
What will happen to the pressure of a confined gas if the temperature of the gas is increased? The pressure will increase.
What are three methods of heat transfer? Conduction, convection and radiation.
What is meant by the absolute humidity of the atmosphere? The actual amount of water that is in a given volume of air.
Created by: Aima2019

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