Car b is initially stationary and is struck by car a moving with initial speed v1 = 20 mi / hr. the cars become entangled and move together with speed v′ after the collision. if the time duration of the collision is 0.1 sec, determine (a) the common fi nal speed v′, (b) the average acceleration of each car during the collision, and (c) the magnitude r of the average force exerted by each car on the other car during the impact. all brakes are released during the collision

Consider a power plant with water as the working fluid that operates on an ideal rankine cycle. it has a net power output of 45mw. superheated steam enters the turbine at 7mpa and 500°c (h=3411.4 kj/kg; s=6.8 kj/kg k) and is cooled in the condenser at a pressure of 10 kpa by running cooling water from a lake through the tubes of the condenser at a rate of 2000 kg/s. (a) show the cycle on a t-s diagram (a right schematic is fine - you do not need to calculate the temperatures at each point); (b)-determine the work done by the turbine and the pump in kj/kg; (c)-the mass flow rate of water used by the power plant; (d)-the thermal efficiency of the cycle; (e)-the temperature rise of the cooling water. assume the cooling water is incompressible with cp 4.18 kj/kg°c.