Which of the following sets of concurrent forces may be in equilibrium ?

Options

A. F1=3N, F2= 5N, F3=9N
B. F1=3N, F2=5N, F3=1N
C. F1=3N,F2=5N,F3-=15N
D. F1=3N,F2=5N,F3=6N

Answer

B, C

Explanation

`vec(r)=a cos omegat hat(i) + a sin omega t hat(j)`
velocity `=vec(v)=(dvec(r))/(dt)=-a omega sin omega t hat(i)+a omega cos omega t hat(j)`
Acceleration `=(d^(2)vec(r))/(dt^(2))=-a omega^(2) cos omegat hat(i)-a omega^(2) sin omega t hat(j)=-omega^(2)vec(r)`