Venus is the brightest object in the sky after the Sun. Its brightness is due to an abundant and thick atmosphere made mostly of carbon dioxide which reflects the incoming light back into space. Many probes were destroyed trying to reach the surface of Venus, however, a few survived and reported that the pressure on the surface of Venus is 90 times greater than the pressure at sea level on Earth. What is the pressure on the surface of Venus in atmospheres

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.