An oil with density 950 kg/m3 and kinematic viscosity 2·10-5 m2 /s flows through a horizontal pipe of 30-cm-diameter. Between locations 1 and 2 (which are 100 m apart), a pressure head drop of 8 m is measured. The relative roughness of the pipe is e/D = 0.0002. Find the average velocity [m/s] and the flow rate [m3 /s] in the pipe.

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error

How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential? a. the kinetic energy increases. b.the kinetic energy decreases. c.the kinetic energy remains the same. d.the kinetic energy is always zero.

Immediately upon reaching its lowest point, a falling pendulum bob has its greatest amount of energy, which is the initial amount of potential energy. a. heat; less than b. heat; more than c. kinetic; less than d. kinetic; more than