A car engine burns gas at 495 K, and exhausts to the air at 293 K. If it ran at the highest possible efficiency and used 10000 j input heat how much heat would be rejected into the air

One object has a mass of 1 kg and another object has a mass of 3 kg. if the speeds are the same, which of the following is true about their kinetic energy?

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

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?