For this device the liquid to be tested is drawn into the tube to a level above the top etched line. the time is then obtained for the liquid to drain to the bottom etched line. the kinematic viscosity, ν, in m2/s is then obtained from the equation ν = kr4t where k is a constant, r is the radius of the capillary tube in mm, and t is the drain time in seconds. when glycerin at 20 ˚c (υ=1.19·10-3 m2/s) is used as a calibration fluid in a particular viscometer the drain time is 1430 s. when a liquid having a density of 970 kg/m3 is tested in the same viscometer the drain time is 900 s. what is the dynamic viscosity of this liquid?

Air pressure is measured in pascals. for a professional american football game, the ball should be inflated to about 90,000 pascals. scientists studied the effects of air temperature on the pressure inside american footballs by taking these steps: 1. prepare 100 footballs. 2. measure each football's air pressure. 3. divide footballs into 10 groups. 4. place the groups in different lockers cooled to different air temperatures. 5. after 12 hours, remove the footballs from lockers. 6. measure each football's pressure again. 7. compare the new pressures to the starting pressures. what two terms best describe the variable "air pressure inside the football" in this experiment? independent, qualitative independent, quantitative dependent, qualitative dependent, quantitative