Which arrangement in relative size is correct? (< sign means 'smaller than')
proton < electron < neutron < atomic nucleus
atomic nucleus < proton < electron < atom
proton < neutron < atomic nucleus < electron
electron < neutron < atomic nucleus < atom

You have been called to testify as an expert witness in a trial involving a head-on collision. car a weighs 1515 lb and was traveling eastward. car b weighs 1125 lb and was traveling westward at 44.0 mph. the cars locked bumpers and slid eastward with their wheels locked for 22.5 ft before stopping. you have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750 . how fast (in miles per hour) was car a traveling just before the collision? (this problem uses english units because they would be used in a u.s. legal proceeding.)

Identical marbles are released from the same height on each of the following four frictionless ramps . compare the speed of the marbles at the end of each ramp. explain your reasoning

What is the measurement of how fast an object moves relative to a reference point?