Which is true of all covalent compounds? Group of answer choices They are usually made of a metal and a nonmetal. They are good conductors in water. They are electrically charged. They share electrons in bonds.

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?

Acar travels 40m in 8 seconds find the car speed

Of is j/kg·k. if a 2.6 kg of isk to k,is ?