1. A steel ball is swung around in a horizontal circle at a constant speed on a
ID: 1661938 • Letter: 1
Question
1. A steel ball is swung around in a horizontal circle at a constant speed on a string ass here from above. If the string breaks, along which path with the ball follow? (a)+ (b) a. b. s (e) d. 2. Two The second fly, B, lands on a spot that is at ½ r, what is the relative speed of fly B compared to fly A. flies land on a spinning record. One fly, A, lands at the edge of the record at distance, r. a. Fly B moves at the same speed as fly A b. Fly B moves at a speed that is ½ the speed offly A. c. Fly B moves at a speed that is ¼ the speed ornyA. d. Fly B moves at a speed that is twice the speed of fly A. e. Fly B moves at a speed that is four times the speed of fly A. 3. In a rotating vertical cylinder (Rotor-Ride) a rider finds herself pressed with her back to the Which is the correct free-body diagram for the forces on her when the floor drops rotating wall. away? a. b. d.Explanation / Answer
The ball should travel tangentially to the direction to its circle of motion.
So answer will be [d]
Q2
v=rw
where v is the liear velocity, r is the radius and w is the angular velocity. v1r1=v2r2
rw=r/2w
==>v2=1/2 v1
fly B moves at a speed half the speed of A
Answer=[b]
Q3
Answer [a]
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