Firefighters have been called to the scene of a warehouse fire. The battalion chief informs the crew that the warehouse is used to store cleaning fluids, which are highly flammable. What should the firefighters use to extinguish the fires with these types of fuels? A.) Class A foams

B.) Class B foams

C.) water

D.) oxygen

ANSWER: B

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

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?

Agas mixture consists of 8 kmol of h2 and 2 kmol of n2. determine the mass of each gas and the apparent gas constant of the mixture.