A 650 N student exerts a constant horizontal force on a large 980 N cabinet alon

Question

A 650 N student exerts a constant horizontal force on a large 980 N cabinet along the dormitor corridor as the cabinet slides along the floor exerts 8 200N frictional force on it opposing the cabinet's motion Nevertheless, both the student and the cabinet speed up at a steady rate of as she pushes the cabinet down the corridor her feet do not slip on the carridor floor Find the magnitude of the force which the student exerts on the cabinet 200 N 200 N 330N 650 N 213 N Find the magnitude of the resultant force acting on the student 200 N. 130 N 13.3 N 20.0 N 133 N Find the magnitude or the frictional force which the floor exerts'on the student 133 N 200 N 450 N 233 N 330 N Fine the minimum coefficient of static friction between the student's feet and the floor 0.358 0.308 0.338 0.204 0.136 Find the coefficient of Kinetic friction between the cabinet and the floor 0.136 0.204 1.00 0.020 0.224

Explanation / Answer

20.20:

the force on the cabine by the student is,

ma = F -f

ma = F -200 N

[650/9.8]*0.2 = F -200 N

Hnece, the force exerted on the cabinet is,

F = 213.3 N = 213 N

Option e is correct.

20.21:

the resultant force exerted on the student is,

Fres = 213.3 N - 200 N = 13.3 N

20.22:

The frictional force exerted on the student is,

f = 213 N + {m+M}a = 213 +   [650+980/9.8]*0.2 = 233 N

option d is correct

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