It requires 1250 J of work to lift a car high enough to change a tire. How much work must done by the person operating the lift if the car jack is 45% efficient?

F500 j of energy were added to 1 kg of each of these samples, which would experience the least temperature increase?

Ahydroelectric plant takes energy from water and turns it into electrical energy. what are the transformations of energy in the water molecules that are used in the process of generating electricity this way?

Road users moving into your lane, brake lights, and abrupt changes in road surface are a. rare at night b. indicators of potential hazards c. not worth worrying about before you reach them d. no problem for experienced drivers