Which equation shows the relationship between the numbers of parent and daughter nuclei after one half-life of a radioactive isotope has passed?
A. Parent nuclei = 2 x daughter nuclei
B. Parent nuclei = daughter nuclei
C. Parent nuclei = 0
D. Daughter nuclei = 2 x parent nuclei

What is the mass of the same rock on the earth

Abird flies directly overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to the ground of 20.0 m/s. the bird has a mass of 2.0 kg. the radius vector to the bird makes an angle \thetaθ with respect to the ground. the radius vector to the bird and its momentum vector lie in the xyxy-plane. what is the bird’s angular momentum about the point where you are standing?

As the distance from a magnet increases, what happens to the magnet force?