A small cube, with a mass of 3 kg, slides along a frictionless horizontal surface at a constant speed of 15 m/s until it collides with, and sticks to, a large wooden 4.5 kg
block. The large block is attached to the left end of a spring with a spring constant of
80 N/m as shown in the diagram.

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.