Under the law influence of a force, an object of mass 4 kg accelerates from 3 m/s to 6 m/s in 8 s. How much work was done on the object during this time?

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?

What would be the radius of the earth if it had its actual mass but had the density of nuclei? express your answer to two significant figures and include the appropriate units.