Question 1 A hockey puck with mass 180 g is attached to a rope of length 68.0 cm and swung in a horizontal circle against the ice at a rate of 85.0 rpm. Assuming the ice is frictionless, what is the tension in the rope? 884 N O 3.49x10- N O 1.91x103 N O 9.70 N Question 2 In classes, I used to swing my keys around in a vertical circle to demonstrate circular motion. Suppose at one particular point in the motion of the 240. g keys, when they were at the bottom of the 36.0 cm radius circle, the tension in the string was 5.00 N. What was the angular speed of the keys at that point? 52.9 rpm O 5.54 rpm O 9.23 rpm O 88.1 rpm Question 3 A 1.64 kg toy train rolls around a circular horizontal track. If the train has an angular acceleration of -3.25 rads/s and is released with an angular speed of 17.5 rpm, what time is required for the train to come to a complete stop? O 1.77 s O 0.564 s O 5.38 s O 51.4s