Free ASVAB-SECTION-3 Exam Dumps Preview

In a pulley system, you calculate the mechanical advantage by counting up the number of supporting ropes/strands that support the weight.
In this case, there are 3 supporting strands that support the load, so the mechanical advantage is 3.

If the wheel on the left turns clockwise, the wheel on the right will turn counterclockwise.

Torsion springs coil or uncoil and produce a twisting action, not a direct pull.

One revolution of the winch will move the weight 24 inches, the circumference of the winch drum.

A single block-and-fall is called a runner.

Pulley B will rotate the fastest. Just like meshing gears, the smaller the pulley in a system, the fester it rotates.

Wheel B has to make more revolutions to cover the same ground as Wheel A, so it will cover the distance more slowly.

The formula to determine the mechanical advantage of an incline plane is Length of Ramp ÷ Height of Ramp = Weight of Object ÷ Effort.
8 ÷ 4 = 400 ÷ E
8⁄4 = 400⁄E
8E = 1,600
8E⁄8 = 1,600⁄8
E = 200

E stands for effort needed. 30 (weight of the cat) x 2 (length of resistance arm) = x x 6 (length of effort arm). Do a little multiplication, and you get 60 = 6x.
To isolate x, divide each side by 6:
60 ÷ 6 = 6x ÷ 6, or 10 = x.

Meshed gears always turn in opposite directions.

Acceleration must be considered in designing the maximum rise of the first hill.
Momentum must be considered to ensure the train gets back to the starting point, since it has no motor.
Friction must be considered in the design of the braking system.

The Cat B will move towards the ground.

Heating an enclosed container of boiling water increases the pressure of the water vapor (steam) inside the container and increases the temperature of the water.

Scientists agree that 33,000 foot-pounds per minute is one horsepower.

You can determine the pressure of all that water by multiplying the volume of the aquarium by the weight of the water. Volume = lwh. The bottom of the tank is 18 feet long by 12 feet wide by 10 feet high for a total volume of 2,160 cubic feet (18 x 12 x 10).
A cubic foot of water weighs approximately 62.5 pounds. 2,160 x 62.5 gives an approximate pressure on the bottom of the tank of about 135,000 pounds over the entire surface area.
The surface area of the bottom of the tank is length x width.
216 inches (18 feet x 12) x 144 inches (12 feet x 12) = 31,104.
Dividing the pressure of 135,000 by the number of square inches of surface area gives an approximate PSI of 4.

Valves are placed in piping systems and can be opened or closed in order to control the flow of liquids or gasses.

Deceleration means slowing down.

An axe is a classic example of a wedge.

A compound machine is one in which two or more simple machines work together.

The 20-pound cat and the 4-pound board weigh 24 pounds total or, divided by 2, 12 pounds per scale.

All the listed parts remain stationary except the lower block.

Because 60 seconds comprise a minute, the valve must open 60 times per minute. The cam will open the valve 10 times per revolution, so 60 ÷ 10 = 6.
The cam must make 6 revolutions per minute to raise the valve 60 times per minute.

Apply the leverage formula: Length of Effort Arm divided by Length of Resistance Arm = Resistance Force divided by Effort Force. Or:
9 ÷ 3 = 21 ÷ E (effort force)
3 = 21 ÷ E
3E = 21 ÷ E x E
3E = 21
3E ÷ 3 = 21 ÷ 3
E = 7

Heat is a form of energy - Calories measure heat, beneficence is an attitude or emotion, and motion is something that can cause heat.

The English unit of power is foot pound per second. It takes 550 foot pounds to make 1 horsepower.
The SI unit is the joule per second or watt. A horsepower is 746 watts.
The rate at which work is done is called power. Power is work done per unit of time.

Of the four materials, metal is the best conductor of heat, so a metal skewer would feel the hottest.