Homework Help: Physical Science Two Questions Please help!

Posted by Amaya on Monday, February 27, 2012 at 11:17am.

If no friction acts on a diver during a dive, then which of the following statements is true?

A) The total mechanical energy of the system increases.
B) Potential energy can be converted into kinetic energy but not vice versa.
C) (KE + PE)beginning = (KE + PE)end
D) all of the above

In which of the following does Einstein’s famous equation apply?

A) driver bringing a car to a halt
B) collisions between objects
C) water falling in a waterfall
D) nuclear fission and fusion reactions

Thank you for your help! ^_^

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