Question

How much POWER is used in 30 seconds when you complete 150 Joules of work?

Answer 1

Power of 5 watts is used

Step-by-step explanation:

Mechanical Work and Power

Mechanical work is the amount of energy transferred by a force.

Being F the force vector and s the displacement vector, the work is calculated as:

`W=\vec F\cdot \vec s`

If both the force and displacement are parallel, then we can use the equivalent scalar formula:

W=F.s

Power is the amount of energy converted per unit of time. The SI unit of power is the watt, equal to one joule per second.

The power can be calculated as:

`\displaystyle P=\frac {W}{t}`

Where W is the work and t is the time.

It's required to calculate the power used in t=30 seconds when W=150 Joules of work are completed. Substitute in the formula:

`\displaystyle P=\frac {150}{30}`

P = 5 Watt

Power of 5 watts is used