An 8-kN force is applied over an area of 2 cm^2. What is the stress? 4 MPa

4 kPa

40 kPa

40 MPa

4 Pa

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk