F=ma, so 100=m×10. Solve for m by dividing by 10. The mass is 10 kg.
Change the 8 pounds to kilograms (divide it by 2.2). Then multiply the kg by the speed of light (300,000,000 m/sec) squared. You get a very big number. It's the number of joules of energy equivalent to 8 lbs of mass.
Plugs exposed to liquid such as water; too many things plugged in at once
