HELP asap what does the half-life of an isotope allow scientists to determine?
A . how much life is left in the animal
B . the environment in which the fossil formed
C . the age of the rock or fossil
D . the type of fossil

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?

Calculate the volume of this regular solid. what is the volume of the cone? round your answer to the nearest hundredth

Which of the following forces require physical contact? tension air resistance friction magnetic force applied force