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A viscous liquid is flowing steadily through a pipe of diameter D. Suppose you replace it by 7 parallel pipes, each of diameter D/7, but the same length as the original pipe. If the pressure difference between the ends of these 7 pipes is the same as for the original pipe, what is the total rate of flow in the 7 pipes compared to the original flow rate?
An object is located 12.5 cm in front of a convex mirror, the image being 6.90 cm behind the mirror. How far in front of the mirror is the second object located
A bike wheel (I=m*(r^2)) is spinning at 20 rad/s, at which point a 100 g rat jumps onto the wheel, what is the mass of the bike wheel
A spool of thread has an average radius of 1- cm. If the spool contains 62.8 m of thread, how many turns of thread are on the spool.
Water flowing through a 2.0cm -diameter pipe can fill a 500L bathtub in 4.9min. What is the speed of the water in the pipe
To charged dust particles exert a force of 3.2 * 10-2N on each other. What will be the force if they are moved so they are only 1/8 as far apart?
35MW of power at 45kV (rms) arrives at a town from a generator via 3.4? transmission lines. Calculate the fraction of the power generated that is wasted in the lines
Two metal spheres, each of mass 20 g and initially at rest, are dropped from a height of 9 m in an evacuated chamber. Find the difference in final speeds of the two spheres
Two objects (39.0 and 23.0 kg) are connected by a massless string that passes over a massless, frictionless pulley, find the acceleration of the objects
A 360 kg piano slides 3.1 m down a 25 degree incline and is kept from accelerating by A man who is pushing back on it parallel to the incline, Determine the work done on the piano by the man
Two packages at UPS start sliding down the ramp. Package A has a mass of 6.50 and a coefficient of kinetic friction of 0.19. Package B has a mass of 9.50 and the coefficient of kinetic friction of 0.140. How long does it take package A to reach th..
Two objects of the same mass, m = 1.00 kg, are projected towards each other. The first object initially has velocity (20.0m/s)i^. What is the change in kinetic energy in the collision
The three displacement vectors in the drawing have magnitudes of A = 5.47 m, B = 5.43 m, and C = 3.91 m. Find the resultant ((a) magnitude and (b) directional angle) of the three vectors by means of the component method. Express the directional an..
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