Answer:
Mass of cement used is 62.5 lb
Mass of gravel used is 225 lb
Explanation:
The ratio given here is cement to sand to gravel = 1 : 2.4 : 3.6
So, for 150 lb of sand
C : S : G = 1 : 2.4 : 3.6
Mass of cement used is 62.5 lb
Mass of gravel used is 225 lb
Conversion factors needed:
1 km^2 = 247.11 acres
1 ft = 12 inches.
Covert area and depth:
Area: 28 km^2 x 247.11acre/ 1km^2 = 6919.08 acres
Depth: 2.6 in x 1ft/12in. = 2.6/12 = 0.2167 ft.
Calculate volume:
Volume = area x depth
Volume = 6919.08 x 0.2167 ft = 1499.36 acre-foot
Answer:
d) Is the thermal conductivity of the medium constant or variable.
Explanation:
As we know that
Heat equation with heat generation at unsteady state and with constant thermal conductivity given as
With out heat generation
In 2 -D with out heat generation with constant thermal conductivity
Given equation
So we can say that this is the case of with out heat generation ,unsteady state and with constant thermal conductivity.
So the option d is correct.
d) Is the thermal conductivity of the medium constant or variable.
Answer:
The correct order is as follows:
Arc flash
Shock
Electrocution
Explosion
Fire
Burns