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If the temperature of the balls drops to 850 C prior to quenching, determine the rate of heat transfer from the balls to the air.
Consider two identical 80-kg men who are eating identical meals and doing identical things except that one of them jogs for 30 min every day while the other watches TV.
Evaluate the heat transfer introduced by assuming constant specific heat at constant volume (c sub v) evaluated at 70 degrees F. Discuss your results. Use Matlab for this.
Determine the normal force of rod AB and the radial reaction of the end plate Bon the collar at this instant. Neglect the mass of the rodand the size of the collar.
Determine the normal stress in the rails when the temperature reaches 48oC assuming that the rails (a) are welded to form a continuous track (b) are 10m long with 3 mm gaps between them.
A 1200-kg automobile is moving at a speed of 90km/h when the brakes are fully applied, causing all four wheels to skid.
The potential across the unit is 0.800 V. The heat input to the hot side is 5.50 W. Determine the heat transfer rate from the cold side and the energy conversion efficiency of this device.
The coefficent between A and C and horizontal surface is 0.24= mu s, mu k = 0.2. Determine the tension in cord and acceleration of each block.
If the driver first applies the brakes 150 ft from the tree, at what speed will the car be traveling when it reaches the tree? Include the effect of aerodynamic resistance.
Determine the principal direction for the stresses and strain at a point on a free surface where the following stresses were computed: σ_xx=10ksi (tension) σ_yy=7 ksi (compression), and
Determine the change in the internal energy and enthalpy of water on the basis of A) compressed liquid tables.
If the initial stress was 18 MPa and dropped to 15 MPa after one year of operation (assuming constant strain), will the part replacement under the specified preventative schedule successfully preven
If blocks A and B of mass 10 kg and 6 kg respectively, are placed on the inclined plane and released, determine the force developed in the link.
Determine the tension in cord cd needed to hold the cart from moving. the coefficient of kinetic friction between A and B is μk.
Finally c determine the minimum sample period in s to avoid amplitude ambiguity in the amplitude-frequency spectrum.
Determine a)the fundamental frequency in Hz contained in the signal and b) the mean value of y(t) over the time period from 0 s to 2/3 s. Also c) sketch the amplitude-frequency spectrum of y(t).
If the process occurs slowly enough that the temperature in the tank remains at 298.15K(25"C), how much heat is lost fromthe tank? Assume air to be an ideal gas for which Cp=(7/2)R and Cv=(5/2)R
Assuming constant specific heats for air at room temperature, determine the average temperature of air in 30 min. Assume the air pressure in the room remains constant at 100 kPa.
Taking the density and the specific heat of the oil to be 950 kg/m^3 and 2.2 kJ/kg*C, respectively, determine how long the heater is kept on. Assume the room is well-sealed so that there are no air
Assuming no air has leaked into the pan during cooling, determine if the lid will open or the pan will move up together with the lid.
The magnitude of the velocity of point C is 2 m/s, and the magnitude of the acceleration of point C= 14m/s^2. Determine the acceleration of points B and D.
Your boss asks you to calculate the flow through a natural-gas pipeline. Calculate the flow of gas in pounds per minute at the point of injection.
Its free vibration amplitude decreases to 0.25 of the initial value after five consecutive cycles. Find the value of the damping in the system.
Determine the gpm of cold seawater to be pumped from deep ocean to serve as the cooling medium or heat sink if the cooling water experiences a temperature raise of 7 grades F.
If the container and its contents hit the ground with a veritcal speed v =150 in/sec - deterimine the maximum total force exerted on the instrument by the packaging.