Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Solved Assignments
Asked Questions
Answered Questions
A bike rider has a frontal area of 0.4 m2 and a drag coefficient, CD of 0.9. If he is pedaling at 80 rpm a) what average torque on the crank would he need to keep a steady 20 mph on level ground?
Calculate the number of vacancies per cubic meter in some metal at 688°C. The energy for vacancy formation is 0.87 eV/atom.
A single-effect evaporator system with thermal recompression is being used to concentrate skim milk from an initial total solids content of 9.5%to 25%. The product feed temperature is 5°C and th
The room is 3 m x 4 m x 2.6 meters high. If we treat the room as perfectly insulated, initially at 15 C throughout, and the specific heat of the coals is: c = 2.9 kJ/kg-C and for the air: c = 1.01 k
The coefficent of restitution for the collision is er=0.4. If the duration of impact is 0.5 seconds what is the magnitude of the average loads on people in the cars during the impact.
A series of cylindrically shaped (l= 25 mm, d = 5 mm) ceramic samples are tested are testedin tension. The Weibull distribution coefficient is 5, and 50% of the samples fracture at a stress of 100MN
During which the pressure-volume relationship is PV = constant. Assuming ideal-gas behavior for the air, what is the mass of the air (kg) and the work and heat transfer (each in kJ)?
Compute load transferred from beams and girders to various columns aon each floor. Determine support reactions and draw corresponding shear force and bending moment diagrams of all girders. Neglect
Determine the analytical expression for y and compare its value with the numerical solution at t = 2 minute. Use a time step of 0.5 minute.
A certain ceramic has a fracture toughness of Kic, of 5 MN/m^3/2. A batch of samples of this material contains surface flaws, existing along the circumferences and depth 10 um. Estimate the (a) The
The piston is then released and equilibrium established between the two parts. What is the final equilibrium pressure?
However, the pump requires 60 W of parasitic power to operate continuously. Is installation of the pump justified? Explain. At what value of parasitic power does the addition of the pump become unj
At these conditions, the latent heat of vaporization of ethanol is 779 kJ/kg. The final pressure of the ethanol is 1 atm. What is the final temperature of the ethanol, and why?
Consider a PEFC operating with the following specifications: = 80% and the pressure is 2 atm at the anode, and = 20% and the pressure is 3 atm at the cathode. Assume that the gibbs free energy of fo
Wind is blowing on a 55-gallon drum. Estimate the wind speed needed to tip the drum over. Work in SI units. The mass of the drum is 48 lbm, the diameter is 22.5 in, and the height is 34.5 in.
Estimate the drag of a thin square plate (3m by 4m) when it is towed through water (10 OC). Assume a towing speed of about 5m/s.
A concrete sewer pipe 3 ft in dia is laid so it has a drop in elevation of 1 ft per 1000 ft of lenght. if swage (assume the properties are the same as those of water) flows at a depth of 1.5 ft in t
Piston cylinder contains 1 kg of water. initially the water is at 200 kpa, 20 degrees Celsius. water is now heated until the piston strikes stops at which point the volume of the water is .113 m^3.
Locate the centroid x and y of the cross sectional area and then determine the orientation of the principle axes, which have their origin at the centroid C of the area. Also find the principle mome
Draw and dimension the bar diagram for a 3 3/8 in. shaft, with a Class 3 fit. Draw and dimension a typical hole and shaft for this fit. Use unilateral tolerances and the basic hole system for maximu
Determine the product of inertia of the cross sectional area with respect to the x and y axes that have their origin located at the centroid C
Consider a 15-cell stack hydrogen fuel cell operating steadily in series with 200 cm2 active area per electrode, with a current density of 0.9 A/cm2. The fuel cell nominal voltage is 0.5 V per plate
Water at 60F flows through 5,000 ft of pipe with a 50 ft headloss. The pipe is riveted steel with smooth walls. The rivets cause flow resistance; and therefore e=0.003ft. compute the pipe diameter
Determine Specific volume of the water vapor at intial state using the compressibility chart. Specific volume of the water vapor using at initial state using ideal gas equation.
A jet is coming out of a dive and a sensor in the pilots seat measures a force 800lbs for a pilot whose weight is 180lbs, if the jet intrustments indicates that the plane is traveling at 850 mph, d