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
Explanation
a. We know work done is given by
[tex]W=Force\times displacement[/tex]So
[tex]\begin{gathered} W=3cos55\times s \\ \Rightarrow W=3cos55\times4 \\ \Rightarrow W=6.88J \end{gathered}[/tex]b. We know power is work done per unit time
Thus
[tex]P=\frac{6.88}{30}=0.22W[/tex]Conclusion
a. The work done is 6.88J
b. The power is 0.22 W
