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This topic will cover Work, Power, and Efficiency.

Work = Force * distance

Power = Work / Time

Force or Weight = Mass * Gravity

Gravity = -9.8 meters/second^2 (on Earth)

Let us start with a simple question.

E1. After scoring a touchdown, an 83.0 kilogram wide receiver celebrates by leaving 129 centimeters off the ground. How much work did he do during his celebration?

Work = Force * distance

We are not given force. Force or Weight = Mass * Gravity

Force = 83.0 kilogram * -9.8 meters/second^2

Force = -813.4 N

Work = -813.4 N * distance

Work requires distance to be in meters.

There are 100 centimeters in 1 meter so.

129 centimeters / 100 = 1.29 meters

Work = -813.4 Neutons * 1.29 meters

Work = 1049.286 Neuton * meters or Joules

But we are not done yet. REMEMBER SIGNIFICANT DIGITS!

We are given 83.0 m and 129 cm so then we look at which has the least Significant Digits

83.0 m has the least, it has three so we must use two significant digits, and round our work.

so work is actually equal to 1050 Joules

Now lets say that 1050 Joules is applied for 31.32 Seconds. How much power does this emit?

Power = Work / Time

Work = 1049.286 Joules (always use unrounded)

Time = 31.32 Seconds

Power = 1049.286 Joules / 31.39 Seconds

Power = 33.42739726 Joules / Seconds or Watts (REMEMBER SIGNIFICANT DIGITS)

Power = 33.43 Watts

Power and work are very easy concepts. Please Contact me for more information, or more help.

Well contact me for more help.

This topic will cover Work, Power, and Efficiency.

Work = Force * distance

Power = Work / Time

Force or Weight = Mass * Gravity

Gravity = -9.8 meters/second^2 (on Earth)

Let us start with a simple question.

E1. After scoring a touchdown, an 83.0 kilogram wide receiver celebrates by leaving 129 centimeters off the ground. How much work did he do during his celebration?

Work = Force * distance

We are not given force. Force or Weight = Mass * Gravity

Force = 83.0 kilogram * -9.8 meters/second^2

Force = -813.4 N

Work = -813.4 N * distance

Work requires distance to be in meters.

There are 100 centimeters in 1 meter so.

129 centimeters / 100 = 1.29 meters

Work = -813.4 Neutons * 1.29 meters

Work = 1049.286 Neuton * meters or Joules

But we are not done yet. REMEMBER SIGNIFICANT DIGITS!

We are given 83.0 m and 129 cm so then we look at which has the least Significant Digits

83.0 m has the least, it has three so we must use two significant digits, and round our work.

so work is actually equal to 1050 Joules

Now lets say that 1050 Joules is applied for 31.32 Seconds. How much power does this emit?

Power = Work / Time

Work = 1049.286 Joules (always use unrounded)

Time = 31.32 Seconds

Power = 1049.286 Joules / 31.39 Seconds

Power = 33.42739726 Joules / Seconds or Watts (REMEMBER SIGNIFICANT DIGITS)

Power = 33.43 Watts

Power and work are very easy concepts. Please Contact me for more information, or more help.