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Two pucks are firmly attached by a stretched spring and are initially held at rest on a frictionless surface. The pucks are then released simultaneously. If puck I have three times the mass of puck II, which of the following quantities is the same for both pucks as the spring pulls the two pucks toward each other? 

 

(A) Speed  (B) Velocity  (C) Acceleration  (D) Kinetic energy  (E) Magnitude of momentum

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Sadha
SadhaLv10
6 Dec 2020

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

Two hockey players, Aaron and Brunnhilde, are pushing two pucks on a frictionless ice rink. The pucks are initially at rest on the starting line. (Figure 1) Brunnhilde is pushing puck B, which has a mass three times as great as that of puck A, which Aaron is pushing. The players exert equal constant forces of magnitude F on their pucks, directed horizontally, towards the finish line. They start pushing at the same time, and each player pushes his or her puck until it crosses the finish line, a distance d away.

Part A. Which puck reaches the finish line first?

a. Both pucks reach the finish line at the same time.

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d. More information is needed to answer this question.

Part B. Let K_A be the magnitude of the kinetic energy of puck A at the instant it reaches the finish line. Similarly, K_B is the magnitude of the kinetic energy of puck B at the (possibly different) instant it reaches the finish line. Which of the following statements is true?

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Two identical pucks slide across a level, frictionless table. Initially, the pucks have the same speed, but their velocities are perpendicular to each other as shown. The same constant force is exerted on each puck for the same interval of time: from the instant shown until puck 1 crosses the second dotted line. The pocks remain on the table and do not collide during this time interval.

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In the diagram above, sketch the trajectory of each of the pucks. Explain how you decided to draw the trajectories the way you did.

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When puck I cross the second dotted line, is the magnitude of its momentum greater than, less than, or equal to the magnitude of the momentum of puck 2 at the same instant? Explain the reasoning you used in making this comparison.

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