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A 5oz baseball is 3 ft above te ground when it is stuck by a bat . The horizontal distance to the point where the ball strikes the ground is 180ft . The ball was moving approximately horizontally at 100ft/s before it was stuck , the duration of impact was 0.015 s and the ball was traveling 30 degrees above the horizontal after it was stuck . What was the magnitude of the average impulsive force exerted on the ball by bat ?
A human with a surface area of 2 m^2 and a surface temperature of 27 degrees celcius radiates into a large room (which acts as a black body), the surfaces of which are at 15 degrees celcius.
A drinking water system treats a flow of 3000 gallons per minute. Consider disinfection of a bacteria by ozone with an inactivation constant of K=0.06/min. To reduce the number of bacteria from 400 bact/ml to 4 bact/ml.
A welded connection is in equilibrium under the action of thefour forces shown. Knowing that Fa=8kn and Fb= 16kN, determine the magnitudes of the other forces.
Assume that landing aircraft have priority over departing aircraft. Also assume each aircraft carriers 200 passengers. What is the total delay to the passengers in the 20 departing aircraft?
A rectangular channel of 20 f t width and having n = 0.017 carries flow of 800 f t^3/s. Calculate (a) critical depth (b) the minimum speci c energy (c) the speci c energy when depth of flow is 7 f t.
What is the change in internal energy of the system? Assume the displacement work in a (fully resisted) constant pressure process is given by (*sub 12 means from stage 1 to 2) Wsub12=p(Vsub2-Vsub1).
Determine the magnitudes of the additional loads that must be applied at B and F if the resultant of all six loads is to pass through the center of the mat.
Water flows through the pipe contraction shown. for the given 0.2 m difference in the meter level, determine the flowrate as a function of the diameter of the small pipe, D.
A 75-lb block is supported by the spring arrangement shown. The block is moved vertically downward from its equilibrium position and released. Knowing that the amplitude of the resulting motion is 2 in.,
This project is expected to have a first cost of $2,000,000 and an annual maintenance cost of $50,000. In addition, major repairs costing $250,000 will be required after 25 years and each 15 years thereafter.
Water seeps vertically downward from the bottom of a lake through a uniform material to an aquifer below. The discharge is 0.005 ft^3/s through a 1 ft^2 area of the lake bottom.
A water treatment plant has 6 settling tanks that operate in parallel (the flow gets split into six equal flow streams), and each tank has a volume of 600 m3.
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