A radioactive substance has a decay probability of λ = 0.0025 s-1. How long will it take for the activity to drop to 20 % of its present value?

Determine the maximum r-value of the polar equation r =3+3 cos 0

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)

J. j. thomson’s experiment disproved the theory that an atom