4. A sample of iron receives 50.J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of 0.10 J/gºC, what is the mass of the iron sample? a. 25 g
b. 30 g
c. 20 g
d. 50 g​

Answer is in а phоtо. I cаn оnly uplоаd it to a file hоsting sеrvice. link bеlow!

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the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge