3. an engine’s fuel is heated to 2,000 k and the surrounding air is 300 k. calculate the ideal efficiency of the engine. hint: the efficiency (e) of a carnot engine is defined as the ratio of the work (w) done by the engine to the input heat qh : e=w/qh. w=qh – qc, where qc is the output heat. that is, e=1-qc/qh =1-tc/th, where tc for a temperature of the cold reservoir and th for a temperature of the hot reservoir. the unit of temperature must be in kelvin.

Un jugador de beisbol batea un foul recto en el aire. la pelota deja el bate con una rapidez de 120 km/h. en ausencia de resistencia del aire. ? cual sera la rapidez de la pelota cuando la atrape el catcher

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.

1. a camcorder has a power rating of 19 watts. if the output voltage from its battery is 7 volts, what current does it use?answer units 2. a 1.5m wire carries a 6 a current when a potential difference of 57 v is applied. what is the resistance of the wire? your