Question

Kim pushes horizontally on a block with a force of 800N moving it through a distance of 5.0 m across a level floor in a time of 20s. What is the power used by Kim? A ) 200W B) 80W C) 800W D) 2.0W

Answer 1

A ) 200W

Step-by-step explanation

power is the amount of energy transferred or converted per unit time

`\begin{gathered} Power=(W)/(t) \\ where\text{ P}is\text{ the power \lparen Watts\rparen} \\ W\text{ is the work done} \\ \text{ t is the time} \end{gathered}`

also,• Work done on an object is defined as the magnitude of the force multiplied by the distance moved by the object in the direction of the applied force

`Work(W)=Force\text{ *distance}`

therefore, replacing we have

`\begin{gathered} Power=(W)/(t) \\ Power=(Force*distance)/(time) \end{gathered}`

hence,

Step 1

a)let

`\begin{gathered} Force=800\text{ N} \\ distance=5.0\text{ m} \\ time\text{ = 20 s} \end{gathered}`

b) now, replace in the formula:

`\begin{gathered} Power=(Forced\imaginaryI stance)/(t\imaginaryI me) \\ Power=\frac{800\text{ N*5.0 m}}{20\text{ s}} \\ Power=200\text{ Watts} \end{gathered}`

therefore, the answer is

A ) 200W

I hope this helps you