A 1.7 kg object is swung from the end of a 0.60 m string in a vertical circle. If the velocity of the object is 3.40 m/s, what is the tension in the string, at the top of the circle?

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?