A bicyclist is finishing her repair of a flat tire when a friend rides by with a constant speed of 3.5 m/s. Two second later the bicyclist hops on her bike and accelerates at 2.4 m/s/s until she catches up with her friend. What is her speed when she catches up?

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.