Machines can be made more efficient by reducing . mechanical energy

pressure

kinetic energy

friction

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

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?

Describe cytokinesis in plants and animals. in animals: in plants.