Physics Test - Mark 2

____ Law states that when you change the volume of a confined gas held at a constant temperature, the gas pressure also changes

Boyle's

The three physical states of matter are

solids, liquids, gas

Specific Gravity

the ratio of the density of a solid or liquid to the density of water

Power

the time rate of doing work

Energy stored in a stretched spring is an example of

potential energy

Weight can best be defined as?

the force with which earth's gravity attracts a mass

A force that tends to cause rotation about a point is called a ____

moment

Work is calculated by

multiplying force times distance

The force that holds a body in a curved path and opposes centrifugal force is called

centripetal force

The three methods of heat transfer we have discussed are

conduction, convection, and radiation (radiant for some reason on the test)

Standard atmospheric conditions used at sea level are

29.92 inches of mercury, or 14.7 psi, at 59 F

Pressure that is referenced from zero pressure (or vacuum) is known as

absolute pressure

When using the gas law formulas, you must first convert the values to

absolute temperature and pressure

One horsepower is equivalent to ____ of electrical energy, or ____ foot-pounds per second of mechanical energy

746 watts, 500

Energy stored in a spinning flywheel is an example of ____ energy

kinetic

A fully charged lead-acid battery will have a hydrometer reading

between 1.275 and 1.310

Which of Newton's lLaws states "a body in motion will tend to remain in uniform motion in a straight line unless it is acted upon by an outside force"?

Newton's first law

If energy is neight added to nor taken from the air flowing through a venturi tube (subsonic flow) at the point of lowest velocity the pressure will be

highest

Sound will travel faster in ____ than it does in ____

water, air

The five types of stress found in mechanical bodies are

shear, tension, bending, torsion, and compression

Energy may be classified as

potential or kinetic

____ is the capacity of an object or body to perform work

Energy

(True/False) The Law of Conservation states that matter can be created or destroyed

False

An example of a third class lever is

a landing gear retraction mechanism

When using gearing mechnisms to gaina a mechanical advantage, it is important to remember that the revolution ratio between two gears is opposite the ratio of their teeth. Simply stated

Speed ratio is opposite gear ratio

Planetary gear systems are typically used to ____ the propeller shaft speed on more powerful aircraft engines in order to spin the prop at a ___

reduce, more efficient rpm for the prop