6. Energy self-eval q's

What quantity described the amount of matter contained in an object?

mass

A unit of energy representing 1 Newton-meter is?

joule

A burning match would produce which of the following form(s. of energy (you may select more than one)

1. heat

2. nuclear

3. electrical

4. mechanical

5. light

light and heat

The gasoline in the tank of your car contains energy (used to move the car. in which of the following form(s)?

1. chemical

2. nuclear

3. electrical

4. mechanical

5. light

chemical

"Energy is neither created nor destroyed" is the:

first law of energy

A piece of coal has 1000 Joules of chemical energy but when burned only 200 Joules could be converted to mechanical energy. The remaining 800 Joules were converted to heat. Identify which law applies

first and second law of energy

Which of the following would allow heat to be converted to Kinetic Energy?

1. solar calculator

2. toaster

3. hair dryer

4. photosynthesis

5. automobile

hair dryer

Which of the following would allow light to be converted to electricity?

1. radio

2. toaster

3. hair dryer

4. solar calculator

5. automobile

solar calculator

Which of the following has the most energy?

An object experiencing a force of 22500 N suspended at a height of .2 meters

What is the amount of kinetic energy in a 22 Kg object moving at a velocity of 20 m/s?

4,400

How much work have you done to move a object with a force of 75 N through a distance of 250 cm?

187.5

How much work will be done walking up a flight of stairs 2.7 meters high assuming you weigh 145 pounds?

1,761.75

What is the horsepower of a car that is experiencing a force of 1,600 pounds and is moving 100 meters in 7 seconds?

137.9

Calculate the amount of power used by a person who is experiencing a force of 145 pounds and is moving 60 meters in 10 seconds

3,915

Determine the work output of a simple machine. The resistance is 5.4 Newton and the resistance distance is 0.05 meters.

.27

What is the work output (Wo) of a simple machine if the resistance is 5.4 Newton and the resistance distance is 0.20 meters?

1.08

Determine the work input of a simple machine. The effort distance is 0.045 meters and the actual effort is 5.4 Newtons

.24

If the work input is 1.10 Joules and the effort distance is .20 meters, determine the actual effort

5.5

If the work output is 0.54 Joules and the work input is 0.55 Joules, what is the percent of efficiency of a simple machine?

98.2%

Determine the percent of efficiency of a simple machine whose work input is 1.08 Joules and the work output is also 1.08 Joules.

100%

What unit is work?

Joules

What unit is power?

watts