Power is the force required to push something the work done by a system the speed of an object the rate that the energy of a system is transformed the energy of a system

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

What happens to an isotope during radioactive decay?