Two objects, a and b, are held one meter above the horiz'ontal ground. the mass of b is twice as great as the mass of a. if pe is the gravitational potential energy of a relative to the ground, then the gravitational potential energy of b relative to the ground 15? a) pe 13) 2pe c) 2p_e d) 4pe

Karen is running forward at a speed of 9 m/s. she tosses her sweaty headband backward at a speed of 20 m/s. the speed of the headband, to the nearest whole number relative to a stationary observer watching karen

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?

What is the equation for electrical work?