The puck in the figure has a mass of 0.120 kg. Its original distance from the center of rotation is

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The puck in the figure has a mass of 0.120 kg. Its original distance from the center of rotation is 40.0 cm, and it moves with a speed of 80.0 cm/s. The string is pulled downward 15.0 cm through the hole in the frictionless table. Determine the work done on the puck. Hint: Consider the change in kinetic energy of the puck.
  1. WNY Tutor
  2. physics
  3. serway
  4. the puck in the figure
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Thank you so much for these videos! They are extremely helpful.

cookiemonster
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Thank you, this really helped me out, appreciate it

RandomSparkles
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In the work equation, you have r square as part of the I components. But w is v divided by r, so w squared components have 1/r squared. You get r2/r2, which cancels out. No need to multiply by r2 and then divide by r2, (twice). All that's left is 1/2 of m times v squared (you already found the v initial and final). Right?

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