Abicyclist passing through a city accelerates after he passes the sign post marking the city limits at x=0. his acceleration is constant at 5.0 m/s^2 east. at time t1= 0.0s, he is located at x1 = 6.0m and has a velocity v1=4.0 m/s east.

a) find his position and velocity at t2= 2.0s.

b) how far is he from the sign post when his velocity is 6.0 m/s.

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.