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a steel oil pipeline spans a river gorge 100 m wide. the inside wall is electrically heated to reduce the viscosity of the oil to ease pumping. an average value for the din in the gorge in 10 m/s. assuming that the average convection heat transfer coefficient is three times that for no wind, determine the heat lost per day for the pipe in calories. outside temo is 0, inside wall temp is 100.
Two electrons in an atom are separated by 1.5 × 10^?10 m, the typical size of an atom, What is the force between them
how long does it take the engine to lift the crate a vertical distance of 19.8 m? Friction in the system is negligible.
Dan is gliding on his skateboard at 2m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 7.00m/s (as measured by an observer on the ground). Dan's mass is 50 kg and the skateboard's mass is 5.00 kg.
How much work did the movers do (horizontally) pushing a 150- crate 10.2 across a rough floor without acceleration, if an effective coefficient of friction was 0.50.
The coefficient of expansion of iron and zinc
A rotating door is made from four rectangular sections, as indicated in the drawing. The mass of each section is 80kg. A person pushes on the outer edge of one section with a force of F = 72N that is directed perpendicular to the section. Find out..
find the x and y components of each vector.
If the alternating current in a circuit is described by the equation I=20sin60t, what are the peak current and frequency
find out the magnitude of force exerted on the lower end of the boom by the hinge.
A speedboat moving at 33.0 m/s approaches a no-wake buoy marker 100 m ahead. The pilot slows the boat with a constant acceleration of ?3.20 m/s2 by reducing the throttle. (a) How long does it take the boat to reach the buoy? (b)What is the velocit..
What is the terminal speed at which the bar falls.
A 473g wood block is given a quick push across a table. During the push it accelerates at a rate of 0.69m/s2, what was the strength of the force used to push the block to start with
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