Question

13. A set of pulleys lifts an 800 N crate 4 meters in 7 seconds. What power was used?

Answer 1

Answer:power=457.1watts

Explanation:

Answer 2

Answer:

457.14 Watt

Explanation:

The information we have is:

Force: $F=800N$

Distance: $d=4m$

Time: $t=7s$

the formula for the power is:

$P=\frac{W}{t}$

where $W$ is work, and $t$ si time.

Also, the formula for work is:

$W=F*d$

Where $F$ is the force, and $d$ is the distance.

Substituting the formula for work into the formula for power:

$W=\frac{F*d}{t}$

substituting all the values to find the power:

$P=\frac{(800N)(4m)}{7s}=\frac{3200Nm}{7s}\\ P=457.14W$

the power that was used is 457.14 Watt