Which of the following is not true of alloys?
a. alloys are made of two or more metals combined physically.
b. the mixture of metals in an alloy is based upon the desired use.
c. alloys can be substitutional or interstitial.
d. an example of an alloy is copper.

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

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(jacemorris04)