Problem 4.9 A rocket-powered hockey puck moves on a horizontal frictionless tabl

Question

Problem 4.9 A rocket-powered hockey puck moves on a horizontal frictionless table. The figure below shows the graphs of v, arid Vi,,, the x- and y-components of the puck?s velocity. The puck starts at the origin. Part A in which direction is the puck moving at t = 2 s ? Give your answer as an angle from the x-axis. Express your answer using two significant figures. Part B How far from the origin is the puck at 4 s? Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

= tan-1 (Velocity y/ Velocity x) at t = 2s

so at t=2 sec vx=16cm/sec(appx as per the graph)

at t=2sec vy=30cm/sec

= tan-1 (Velocity y/ Velocity x)

=tan-1(30/16)

=62 degrees--answer to a

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