Explain the advantages of operating a motor vehicle that is 20% efficient instead of one that is 10 % efficient

What is the weight of a 8-kg substance in n, kn, kg·m/s2, kgf, lbm·ft/s2, and lbf?

Ablue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.5 m/s 2 . a green car arrives at the position of the stop-light 6.5 s after the light had turned green. if t = 0 when the light turns green, at what time does the green car catch the blue car if the green car maintains the slowest constant speed necessary to catch up to the blue car? answer in units of s.

Electromagnetic force is present when electromagnetic fields a. become charged as they lose electrons. b. become stable as they come in contact with other forces. c. interact with charged particles. d. gain energy from other forces.