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If all trucks travel at a speed v', cars at a speed v, and the fraction of vehicles passing a stationary observer that are trucks is p, what fraction of vehicles would be trucks on a photograph? Please derive a formula for this fraction as a function of p, v, and v'. Show all your steps.
Evaluate this fraction for v' = 50 mph, v= 80 mph, p = 30%.
is fabricated of two 300 mm X 25 mm flange plates and a 800 mm X 16 mm web plate. the plates are joined by four fillet welds that run continuously for the length of the girder. each weld has an allowable load in shear of 920 kN/m.
An object is held in the air 30m above ground and released. Assume the drag force due to air resistance is given by Fd = 1.0Vy. What is the mass of the object necessary so that it reaches ground in 3s
Emissions of heat-trapping carbon dioxide (CO2) reached an all-time high of 31.6 gigatons in 2011, a 3.2% increase over 2010. The International Energy Agency said this further reduces the chance that the world can avoid a dangerous rise
Water flows in a 100-m long pipe at 3 m/s. If the water temperature is 20 degrees C, determine the minimum valve-closure time to avoid creating the water-hammer pressures. What is the maximum water-hammer pressure that can occur
Water in a pip has a pressure of 22.1 lb/ft2. What is the pressure head?
A trapezoidal channel is to be excavated in alluvial material on a bed slope of 1:10000. The side slopes will be 1(vertical) : 2(horizontal). Details of the bed material are as follows: Particle diameter 4 mm
The three blocks shown move move with constant velocities. Find the velocity of each block, knowing that the relative velocity of A with respect to C is 300 mm/s upward and that the relative velocity of B with respect to A is 200 mm/s downward.
A flat bar of cross section 20mm by 70mm elongates 4.0mm in a length of 2.0m as a result of axial load. If the elastic modulus is 199x106 kN/m2 and Poisson's ratio is 0.25 for the material, find the axial load and the total change in each cross secti..
Discuss the differences between how engineers see themselves and how the public sees engineers
AGNO3 is added to a solution containing 0.001 mol Cl- amd 0.001 mol Br- per liter. What are the concentrations of Cl- and Br- remaining when AgCl just begins to precipitate?
a solid cylinder of 50 mm diameter and 900 mm length is subjected to a tensile force of 120kN. One part f the cylinder L1 long is of steel, the other part, fastened to steel, is aluminum and is L2 long.
A 100-ton train traveling on a horizontal track requires 400 hp to maintain a constant speed of 50 mi/h. Determine (a) the total force needed to overcome axle friction, rolling resistance, and air resistance
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