Question

A horizontal force of magnitude 356 N is employed to push a 78.0-kg block a distance of 18.6 m on a rough horizontal surface. If the block moves at a constant speed, (a) What is the work done by the 356-N force? (b) What is the coefficient of kinetic friction between the block and the rough surface?

Answer 1

6621.6 Joule

0.46525

Step-by-step explanation:

F = Force = 356 N

s = Displacement = 18.6 m

m = Mass of block = 78 kg

Work done

`W=F* s\\\Rightarrow W=356* 18.6\\\Rightarrow W=6621.6\ J`

The work done by the horizontal force is 6621.6 Joule

`F=\mu mg\\\Rightarrow \mu=(F)/(mg)\\\Rightarrow \mu=(356)/(78* 9.81)\\\Rightarrow \mu=0.46525`

The coefficient of friction between the block and the rough surface is 0.46525