What force involves the attraction between objects with mass?
gravitational
electromagnetic
weak nuclear
strong nuclear

What do you think car designers do if the damage caused by a crash test is too severe?

(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.)

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.