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Two identical pucks slide across a level frictionless table.Initially, the pucks have the same speed, but their velocities areperpendicular to each other as shown. The same constant force isexerted on each puck for the same time interval: from the instantshown until puck 1 crosses the second dotted line. The pucks remainon the table and do not collide during this time interval.

When puck 1 crosses the second dotted line, is the kineticenergy of puck 1 greater than, less than, or equal to the kineticenergy of puck 2 at the same instant? Explain the reasoning youused in making this comparison.

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Irving Heathcote
Irving HeathcoteLv2
26 Oct 2019

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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.

b. Puck A reaches the finish line first.

c. Puck B reaches the finish line first.

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?

a. K_A = K_B

b. K_A < K_B

c. K_A > K_B

d. You need more information to decide.

Object A collides on a horizontal frictionless surface with an initially stationary target, object X. The initial and final velocities of object A are shown. The final velocity of object X is not given.

a). At an instant during the collision, is the net force on object A zero or non-zero?

b) [During the collision, is the momentum of object A conserved? Explain. Is the momentum of the system consisting of objects A and X conserved? Explain. On the same horizontal surface, object C collides with an initially stationary target, object Z. The initial speeds of objects C and A are the same, and m_x = m_z > m_A = m_c. After the collisions, object C moves in the direction shown and has the same final speed as object A. In the space below, copy the vectors v_C1 and v_cr with their tails together. Use these vectors to draw the change in velocity vector for glider C, Delta v_c. Is the magnitude of the change in velocity vector of object A greater than, less than, or equal to the magnitude of the change in velocity vector of object C? Explain? Is the magnitude of the change in the momentum vector of object A greater than, less than, or equal to the magnitude of the change in the momentum vector of object C? Explain? Is the final speed of object X greater than, less than, or equal to the final speed of object Z? Explain. Consider the following incorrect statement: Gliders A and C have some change in momentum. They have the same mass, and because they have the same initial speed and same final speed. Delta-v is the same for each of.them." Discuss the error(s) in the reasoning.

Object A collides on a horizontal frictionless sur

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