Why is the relationship between force and time important to a helmet designer?

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

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.

Ways that industry and agriculture use physical properties to separate substances