Answer:
(a) See image attached
(b) 486.7 N
(c) 103.06 N
Explanation:
(a)
The free body diagram is attached
(b)
Normal force (N)
Where m is the mass, g for acceleration due to gravity, F for pulling force and is angle of inclination
Substituting 70 Kg for m, for g, 400 N for F and for we obtain
N=(70*9.81)-(400sin 30)=486.7 N
N=486.7 N
(c)
where is the net force on horizontal axis, Fr is frictional force which is given by
Substituting 400 for F, for , 0.5 for and 486.7 for N we obtain
Therefore, horizontal force is 103.06 N