Asystem consists of a copper tank whose mass is 13 kg, 4 kg of water, and an electrical resistor of negligible mass. the system is insulated on its outer surface. initially the temperature of the copper is 27°c and the temperature of the water is 50°c. eventually, the system comes to equilibrium at 45 c. "determine the work done"

How would doubling the made of an object change the objects potential energy

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

Why does a collision with an airbag cause less damage than a collision with a steering wheel