As the object in the picture moves from point A to point D across the surface, the sum of the gravitational and kinetic energies. A. decreases only B. increases and then decreases. C. decreases and then increases. D. remains the same. The object will have the maximum Kinetic Energy at point___. A B C D The object will have the maximum Potential Energy at point. A B C D If the car has a mass of 1000kg and starts at rest, what is the speed of the car at point C

Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.