Explain why materials made up of magnetic atoms will sometimes not be magnetic themselves.

Bone-strengthening physical activity done increases bone-mineral content and bone density in youth.

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

In the first law of thermodynamics, triangle e=q-w, what does q stand for