1. The half-life of cobalt-60 is 5 years. If you have 10 grams of Co-60, how much do you have after 15 years?
I
A: 1.25 g
B:58
C: 10 g
D: 20 g

the volume increases

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.

question answered by

(jacemorris04)

since electrons are negative the answer is neagtaive

level 4 to level 2 : ))