Consider a 2.3-kw hooded electric open burner in an area where the unit costs of electricity and natural gas are $0.10/kwh and $1.20/therm (1 therm = 105,500 kj), respectively. the efficiency of open burners can be taken to be 73 % for electric burners and 38 % for gas burners. determine the rate of energy consumption and the unit cost of utilized energy for both electric and gas burners. (round the final answers to three decimal places.)

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.

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?