Answer:
Option (a)
Explanation :
A stage hand starts sliding a large piece of stage scenery originally at rest by pulling it horizontally with a force of 176 N.
Hence Force applied [tex]\text { Fapplied }=176 \mathrm{N}[/tex]
Force on piece of scenery [tex]\mathrm{F}_{\mathrm{g}}=490 \mathrm{N}[/tex]
[tex]\Sigma \mathrm{F} \mathrm{y}=\mathrm{F} \mathrm{n}-\mathrm{Fg}=0[/tex]
[tex]\mathrm{Fn}=\mathrm{Fg}[/tex]
[tex]\mathrm{FS}_{\mathrm{max}}=\mathrm{F}_{\mathrm{applied}}[/tex]
µk = [tex]\frac{\mathrm{Fs} \max }{\mathrm{Fn}}[/tex]
= [tex]\frac{\text { Fapplied }}{\mathrm{Fg}}[/tex]
=[tex]\frac{176}{490}[/tex] =0.36
coefficient of static friction is 0.36
