contestada

Suppose a 49-N sled is resting on packed snow. The coefficient of kinetic friction is 0.11. If a person weighing 585 N sits on the sled, what force is needed to pull the sled across the snow at constant speed?

Respuesta :

lublana

Answer:

69.74 N

Explanation:

We are given that

Weight of sled=49 N

Coefficient of kinetic friction[tex],\mu_k=0.11[/tex]

Weight of person=585 N

Total weight==mg=49+585=634 N

We know that

Force needed to pull the sled across the snow at constant speed,F=Kinetic friction

[tex]F=\mu_k N[/tex]

Where N= Normal=mg

[tex]F=0.11\times 634=69.74 N[/tex]

Hence, the force is needed  to pull the sled across the snow at constant speed=69.74 N