A 5.0 kg mass is moving to the right at 3.0 m/s. An 10.0 kg mass is moving to the left at 3.0 m/s. If after collision the two masses join together, what is their velocity after collision? -1.0m/s
-0.33m/s
+3.0m/s
-0.66m/s

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.