Answer:
9.81 N
Explanation:
Newton's second law states that the acceleration of an object produced by a force is directly proportional to the net force and inversely proportional to its mass.
Hence:
Sum of vertical forces = mass * acceleration
[tex]T-mg=\frac{mv^2}{r} \\\\g=9.81m/^2,r=76cm=0.78\\\\T-0.42(9.81)=\frac{0.42*3.21^2}{0.76}\\ \\T-4.12=5.69\\\\T=9.81\ N[/tex]
