Acertain gasoline engine has an efficiency of 30%; that is, it converts into useful work 30% of the heat generated by burning a fuel. (a) if the engine consumes 0.80 l/h of a gasoline with a heating value of 3: 25 104 kj/l, how much power does it provide? express the answer both in kw and horsepower. (b) suppose the fuel is changed to include 10% ethanol by volume. the heating value of ethanol is approximately 2: 34 104 kj/l and volumes of gasoline and ethanol may be assumed additive. at what rate (l/h) does the fuel mixture have to be consumed to produce the same power as gasoline?

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)