Carbon tetrachloride has a drinking water standard with a Maximum Contaminant Limit (MCL) of 0.005 mg/L. Potency factor is 0.13 (mg/kg-day)-1 for oral route. Assuming a 70 kg person drinking 2 L for 70 years, what is the upper-bound cancer risk for an individual?

A. 1 in 10,000
B. 1 in 100,000
C. 2 in 10,000
D. 2 in 100,000

Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above

Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa. s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.