A car accelerates from 0-30m/s in 8s. The car has a mass of 1300kg. Compute the energy needed by the car, and the energy actually used if the engine is 27% efficient. show your full work please

An incident ray through the focal point of a spherical mirror will: reflect through the center of curvature. reflect back through the focal point. reflect parallel to the principle axis. reflect the same direction as the incident ray.

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

If a balloon is taken outside on a very cold day, what will occur?