Asample of urea is placed in the reaction vessel of a bomb calorimeter. the temperatures measured before and after combustion are 23.56◦c and 25.34◦c, respectively. if the heat sink is 100 ml of water and the calorimeter’s heat capacity is 45 j/k, what is the change in internal energy in the combustion of the sample of urea?

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?