Question

A young girl drags her favorite dolly by the hair at an angle of 55° to theground for a distance of 4 m.a) if she pulls with a force of 3N, what is the total work that she has done? B) if it takes her half a minute to travel the four meter, what is the girl’s power?

Answer 1

Given,

A young girl drags her favorite dolly by the hair at an angle of 55° to the

ground for a distance of s= 4 m.

To find

a. The work done

b. The girls power

Step-by-step explanation

a. We know work done is given by

`W=Force* displacement`

So

`\begin{gathered} W=3cos55* s \\ \Rightarrow W=3cos55*4 \\ \Rightarrow W=6.88J \end{gathered}`

b. We know power is work done per unit time

Thus

`P=(6.88)/(30)=0.22W`

Conclusion

a. The work done is 6.88J

b. The power is 0.22 W