Amass weighing 16 lb stretches a spring 8/5 ft. the mass is attached to a viscous damper with a damping constant of 2 lb-sec/ft. the mass is set in motion from its equilibrium position with a downward velocity of 5 in/sec. find the position x of the mass at any time t. plot x versus t. if a force of 0.5 sin (2t) exerted to the system, describe the motion after a very long period of time.

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.)

Which best represents the law of conservation of mass ?

What is a possible result of higher air temperature caused by global warming