A country is deciding what to do about pollution given off by power plants. Which of the following is an example of how science can be used to make
this decision?
A. Scientists are allowed to pass laws about pollution.
O B. Scientists know what kind of power plants people want.
O C. Scientists can measure how much pollution is given off.
O D. Scientists own most of the power plants in the United States.

Consider a u-tube whose arms are open to the atmosphere. now equal volumes of water and light oil (ρ = 49.3 lbm/ft3) are poured from different arms. a person blows from the oil side of the u-tube until the contact surface of the two fluids moves to the bottom of the u-tube, and therefore, the liquid levels in the two arms are the same. if the fluid height in each arm is 30 in, determine the gage pressure exerted by the person on the oil by blowing.