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A nasty teenager is dropping tomatoes from a bridge onto cars onthe road show. The height of the bridge (the point from whichthe tomatoes are dropped) is 10 meters above the ground. Theteen first sees cars when they come around a corner which is 50meters away. All cars drive at exactly the speed limit of 40kilometers per hour.
a) How long after a car comes around the curve does sheneed to wait before dropping a tomato to hit the hood of the car ata height of 1.0 meters above the ground?
b) After some time, the teen gets bored with justdropping the tomatoes. As a challenge, she decides to throwthe tomatoes straight up with some initial velocity, V(nought),rather that just dropping them. Asssume she throws thetomatoes 1.5 seconds after she sees the cars. What value ofV(nought) is needed for the tomatoes to hit the cars at the sameheight above the road?
c) Eventually, the teen gets bored with this new game and shedecides to throw the tomatoes straight down at an initialvelocity of 15 m/s. Now, how long does she need to wait afterseeing the cars to hit them at the same height?
compute the max possible moment at the centerline of the beam and the absolute moment in the beam.
Just below the point where a continuous discharge of pollution mixes with the river, the BOD is 10.9 mg/L and the DO is 7.6 mg/L. The river and waste mixture has a temperature of 20oC, a deoxygentation constant of 0.2/day
the level of water in a city water tower is 125ft. above the ground. The tank is kept with an air space which can be pressurized with compressed air. It is important to maintain a pressure at the bottom of the tower at 75 psig.
A rigid 1ft^3 vessel contains R-134a originally at -20F and 27.7% quality. The refrigerant is then heated until its temperature is 100F. Calculate the heat transfer required to do this, in Btu.
How does aggregate size influence the coefficient of permeability of concrete? List other factors that determine the permeability of concrete in a structure.
A Rankine cycle has a boiler pressure of 2500 psi and a condenser pressure of 1psi. The temperature at the inlet of the turbine is 800F. The turbine has an isentropic efficiency of 90 percent and the pump operates isentropically.
Determine the peak outflow rate when the inflow hydrograph is routed through this basin and what is the design storage and water surface elevation at the peak outflow rate.
However, design codes which deal with shear friction design place an upper limit on the magnitude of the shear force for which the plane can be designed. Explain why this is so.
a 3200-lb car (Cd = 0.35, Af = 25ft^2, and p= 0.002378 slugs/ft^3) has 14-inch-radius wheels, a drivetrain efficiency of 93%, an overall gear reducation ratio of 3.2 to 1, and drive axle slippage of 3.5%. the engine develops a maximum torque of 21..
How much money should an environmental soil cleaning company borrow to finance a site reclamation project if it expects revenue of $140,000 in the first year increasing by 3% per year over the 5-year cleanup period? The interest rate is 8%.
Given the following information, determine the required DO concentration in the treatment plant effluent discharge in order to ensure that at no point downstream the DO in the river drops below 4 mg/L
A line is measured with a 2-chain tape, and a suveyors arrows are use to mark the end of the tape lengths . the three tallies are recorde the rear tapeman has eight arrows
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