A large pipe (diameter = 0.080m) is coupled by a watertight fitting to a smaller pipe (diameter = 0.025m). If the water velocity in the large pipe is equal to 0.50 m/s, what is the water velocity in the small pipe? Choices:
-3.7 m/s

-4.4 m/s

-5.8 m/s

-5.1 m/s

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Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

If there's a small amount of friction between two surfaces, the result could be select all that applya. no movement b. heatc. a little bit of movementd. sliding around