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1. Water flows in a rectangular, finished concrete channel at a rate of 2 m3/s. The bottom slope is 0.001. Determine the channel width if the water depth is to be equal to its width.
2. An old, rough-surfaced, 2-m-diameter concrete pipe with a Manning coefficient of 0.025 carries water at a rate of 5.0 m3/s when it is half full. It is to be replaced by a new pipe with a Manning coefficient of 0.012 that is also to flow half full at the same flowrate. Determine the diameter of the new pipe.
The surface of the Sun is approximately at 5700 K, and the temperature of the Earth’s surface is approximately 280 K. What entropy change occurs when 860 J of thermal energy is transferred by heat from the Sun to Earth?
A 15-g ball is shot from a spring gun whose spring has a force constant of 600N/m. The spring can be compressed 5 cm. How high can the ball be shot if the gun is aimed vertically
There is a second sphere identical to the first, except that its center is hollowed out so that it is empty from r = 0 to r = 10 cm. Find the electric field everywhere outside of this sphere
An airplane maintains a speed of 573 km/h relative to the air it is flying through as it makes a trip to a city 689 km away to the north. What time interval is required for the trip if the plane flies through a headwind blowing at 38.1 km/h toward t..
Two ice skaters, with masses of 50.0kg and 85.0kg , are at the center of a 40.0m -diameter circular rink. The skaters push off against each other and glide to opposite edges of the rink.If the heavier skater reaches the edge in 40.0s , how long does ..
A uniform 13-kg trap door is oriented horizontally and hinged as shown. What is the magnitude of the torque on the door
An object initially moving at 12 m/s accelerates uniformly to 33 m/s in 16 s. Calculate the total distance moved
A uniform electric field of magnitude 350 N/C pointing in the positive x-direction acts on an electron, which is initially at rest. The electron has moved 3.10 cm. What is the work done by the field on the electron
You need to design a 1.5 Amp fuse that "blows" if the current exceeds 1.5 A. Find what diameter wire of this material will do the job
A 20kg loudspeaker is suspended 2.0m below the ceiling twocables that are each 30 degrees from vertical. What is the tension in the cables.
A child holds a candy bar 10.0 cm in front of a convex mirrorand notices that the image is only one-half the size of the candybar. What is the radius of curvature of the mirror?
A pond with a flat bottom has a surface area of 730 m2 and a depth of 2.7 m. Find the rate at which energy is transferred by conduction from the surface to the bottom of the pond
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