Which option is an example of a physical model? O A. A clay ball with a slice cut out, showing the layers of Earth
B. A graph of the relative thicknesses of Earth's layers
OC. A mental image of the solar system
O D. A computer weather map created by Doppler radar

On a average work day more than work place firs are reorted

The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. 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