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Posted by on Monday, February 15, 2010 at 7:26pm.

Question: The amount of internal energy needed to raise the temperature of .25 kg of water by 0.2 degrees Celsius is 209.3 J. How fast must a 0.25 kg baseball travel in order for its kinetic energy to equal this internal energy?

KE = (.5)(m)(v^2)
209.3 J = (.5)(.25kg)(v^2)
1674.4 = v^2 **square root both sides**
v = 40.92

^Is ANY of that correct? If not, can anyone help? Thanks so much

  • Physics - , Monday, February 15, 2010 at 8:54pm

    I don't see what 1/4 kg of water has to do with a baseball, but you did the problem correctly.

    The specific heat of a baseball is different from that of water, and its mass is 1/7 kg, so what you have calculated in NOT the velocity needed to raise the baseball 0.2 degrees. It is an arbitrary number.

  • Physics - , Tuesday, January 17, 2012 at 5:30pm

    yes that is correct

  • Physics - , Monday, February 27, 2012 at 9:15pm

    You are right!!

  • Physics - , Thursday, February 2, 2017 at 5:36pm

    yep! and its 2017. :)

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