Question

An air puck of mass 0.278 kg is tied to a string
and allowed to revolve in a circle of radius
1.25 m on a horizontal, frictionless table. The
other end of the string passes through a hole
in the center of the table and a mass of 0.45 kg
is tied to it. The suspended mass remains in
equilibrium while the puck revolves.
What is the tension in the string? The
acceleration due to gravity is 9.8 m/s
2
.
Answer in units of N