Two radioactive materials X1 and X2 have decay constants 8λ and λ respectively. If initially they have the same number of nuclei, when will the ratio of the number of nuclei of X1 to that of X2 will be e-3.

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

In the 1980's, congress authorized the u.s. department of energy to build the wipp facility in the chicuahuan desert in new mexico. what is the purpose of wipp?

Select the word from the list that best fits the definition classification of most stars on the h-r diagram