Three identical pucks on a horizontal air table have repelling magnets. They are

Question

Three identical pucks on a horizontal air table have repelling magnets. They are held together and then released simultaneously. Each has the same speed at any instant. One puck moves due west.

Problem 8.70 Resources « previous | 7 of 11 | next» Problem 8.70 Part A Three identical pucks on a horizontal air table have repelling magnets. They are held together and thern released simultaneously. Each has the same speed at any instant. One puck moves due west. What is the direction of the velocity of each of the other two pucks? One puck moves in a direction 60° north of east and the other puck moves in a direction 60 o south of east. One puck moves in a direction 60° north of west and the other puck moves in a direction 60 south of east. One puck moves in a direction 60° north of east and the other puck moves in a direction 60 One puck moves in a direction 60° north of west and the other puck moves in a direction 60 One puck moves in a direction 30° north of east and the other puck moves in a direction 30 south of west. south of west. south of east. Submit My Answers Give Up ovide Feedback Continue

Explanation / Answer

suppose each have velocity = v and mass = m

Key concept :momentum conservation

Pi = 0 so Pf = 0

so momentum of east puck =m*v east

so other two of them should cancel this momentum so we can get whole momentum = 0

so they should be at 60 degree from west or 30 degree from north so your answer

= 60 from north of east and 60 south of east

total momentum = mv*cos60 +mv*cos60 = mv

mv (west) - mv (east) = 0

answer is first option

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