All engines operate at less than 100 percent efficiency because they heat.

The friction of the water on a boat produces an acceleration of -10. m/s2. if the boat is traveling at 30. m/s and the motor is shut off, how long it take the boat to slow down to 5.0 m/s?

Due in 40 explain in terms of frame of reference if you’re inside a moving train everything on the outside can seem to be moving

Why do metals "give up" their valence electrons?