Which of the three methods of heat transfer is at work when an iceberg, that is floating in the ocean, is melting?? A. conduction
B. convercion
C. radiation

As far as the iceberg is concerned - conduction is taking place because the outer layers melt and disappear in the ocean. Heat is being transferred into the iceberg.

For the ocean waters one would also have convection because as the iceberg melts the ice water that is formed would become more dense than the surrounding water and would sink into the warmer water.

found in the nucleus

has mass of one amu

f=ma a/f/m a= 480/60 a = 8m/s/s that is quick wow