9
pensities of Common Liquids
Substance
Density (g/cm)
water
1.00
cooking oil
0.894
corn syrup
1.36
The mass of an empty container is measured and
found to be 55.75 g. The container is filled to the
rim with water. Its mass is measured again and
found to be 105.75 g. The container is emptied
and dried with a paper towel to remove any
traces of water. It is then filled with an unknown
liquid. The new mass is 123.75 g. Use
calculations to determine if the unknown liquid
is cooking oil or corn syrup.

In a wind tunnel the speed changes as the cross sectional area of the tunnel changes. if the speed in a 6' x 6' square test section is 100 mph, what was the speed upstream of the test section where the tunnel measured 20' x 20'? use conservation of mass and assume incompressible flow. conservation of mass requires that as the flow moves through a path or a duct the product of the density, velocity and cross sectional area must remain constant; i.e., that ova-constant. a model is being tested in a wind tunnel at a speed of 100 mph if the flow in the test section is at sea level standard conditions, what is the pressure at the model's stagnation point? (a) the tunnel speed is being measured by a pitot-static tube connected to a u- tube manometer. what is the reading on that manometer in inches of water? (b) at one point on the model a pressure of 2058 psf is measured. what is the local airspeed at that point?

Sunidhi made a study chart about changes in states of matter. which headings best complete the chart?

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excess electrons is typical. what is the magnitude of the electric force on a protein with this charge in a 1600n/c electric field? write in two significant numbers, and also in newton