An engine has an energy input of 125 J, and 35 J of that energy is transformed into useful energy. What is the efficiency of the engine? 28% 35% 72% 90%.

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

Determine the fraction of the magnitude of kinetic energy lost by a neutron (m1 = 1.01 u) when it collides head-on and elastically with a target particle at rest which is 21h (heavy hydrogen, m = 2.01 u).

Looking at this barometer, is the air pressure high or low? what type of weather would you expect? high, bad low, bad high, good low, good