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A cyclist is able to obtain a maximum speed of 20 mph on a calm day. The total mass of the rider and bike is 90 kg. The rollingresistance for the tires (a constant force) is FR = 7.5N and the drag coefficient and frontal area are CD = 1.2 and A = 0.25m2.Assuming CD is constant, compare the power requirements and calculate the following:(A) What is the maximum speed that the cyclist can reach in a headwind of 5 mph? (ANS: V ∼ 15 mph)(B) In a tailwind of 5 mph?
In a turning operation the feed rate t is .13 mm (.005 in.) and the depth of cut normal to the plane of the paper is 2.5mm (.100 in). The cutting speed is 245 m/min (800 fpm). The cutting force F_c is found to be 1780N (400lb) and the normal force F_..
Hydrogen (H2) enters a combustion chamber with a mass flow rate of 5 lb/h and burns with air entering at 858F, 1 atm with a volumetric flow rate of 75 ft3/min. Determine the percent of theoretical air used.
Superimpose a uniform ?ow V ¼ 10i m=s, a doublet m ¼ 40 m3/s, and a vortex. Locate any stagnation points and ?nd the minimum pressure on the cylinder if the pressure of the standard atmospheric air is zero at a large distance from the cylinder.
an actual refrigerator absorbs 500 kj of heat from a sink at 250 k and reject 660 kj of heat to environment at 300 k.
a triangular field with vertices opq has sides op=402m,pq=388m,and qo=254m. find the perpendicular distance from the vertex p to the opposite side.
Determine the normal force R between the wheel and the horizontal surface. Neglect the weight of the horizontal shaft.
a fixed mass of water m initially a saturated liquid is brought to a saturated vapor condition while its pressure and
Owing to safety requirements, the pressure within a 19.3 ft3 cylinder should not exceed 52 atm. Check the pressure within the cylinder if filled with 100 lb of CO2 maintained at 2128F using the
Define: (i) specific heat capacity (ii) molar heat capacity. (b) Distinguish between: (i) heat capacity at constant volume and constant pressure
A centrifugal compressor has an impeller tip speed of 366 m/s. Determine the absolute Mach number of the flow leaving the radial vanes of the impeller when the radial component of the velocity at impeller exit is 30.5 m/s and the slip factor is .9. G..
A multiple disc has radial width of the friction material 1/5th of the maximum radius. The coefficient of friction is 0.25. Find the total number of discs required to transmit 60 kW at 3000 r.p.m. The maximum diameter of the clutch is 250 mm and the ..
Consider the following investment opportunity: Initial Cost = $126,890; Annual Benefit = $23,000; Useful Life = 30 Years; Salvage Value = $0; What interest rate results in a Benefit Cost Ratio equal to one?
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