Use both symbolic and numerical answer A wellinsulated rigid

Use both symbolic and numerical answer

A well-insulated rigid tank is divided into two regions by a movable partition through which heat can flow via conduction. In the left region air exists with the following properties (2 kg, 5 bar, 350 K). In the right region Co exists with the following properties (4 kg, 2 bar, 450 K). A pin holds the partition in place. The pin is removed and the air and CO achieve pressure and temperature equilibrium. Use a control volume that includes the air, the CO and the partition. Neglect the mass of the partition a. Assume constant specific heat for both air and CO. Look up the necessary specific heat values at an estimated average temperature of 400 K b. Determine the final temperature. c. Using a new, more accurate, average air temperature and a new, more accurate, average Co temperature, estimate how far off, in percent, the original specific heat estimates at 400 K are.

Solution

The loaded four wheel trailer shown in Figure P8.10 has a total mass of 5t and is pulled along a level road. Average resistance to motion (friction and windage) is 2 per cent of the total weight and acts at the same horizontal level as the applied force P. Determine the normal reaction at each of the front and rear wheels when the trailer moves:

a) at constant velocity

b) with forward acceleration 1.5m/s².

(Average resistance to motion is 2% of total weight is not required.)