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During frequent braking under race conditions the disk brake rotors on the car described above reach a temperature of 500C. These disk brakes rely on forced convection to cool them. The dimensions of each disk rotor are: outer radius 130mm; inner radius 50mm; thickness 10mm. (Assume the disk is a simple donut shape ).
i) What is the surface area of the disk rotor (in m2)? (Include both sides and the edges)
ii) Given the heat transfer of the disk rotor is 120 W/m2/K, how much heat energy is radiatred from each of the disk rotors when the ambient air temperature is 30 C
A 30mm pipe X 460 mm rectangular duct carries air. What size square conduit is needed to transport 4m cube per sec of water at a distance of 45m and head loss of of 1.08m.
he oxygen is compressed from 95 kPa, 20 C to 300 kPa, isothermally. Determine the heat transfer assuming (a) the process is reversible, (b) the process is irreversible such that 20% more work is required than the reversible case.
Determine the minimum distance from the diversion that a road sign should be located informing drivers of the temporary change on the highway. The letter height on the road sign is 5 inches.
During the process 40 kJ of heat is transferred from the sphere, while the sphere receives energy in the form of work equal to 20kcal. calculate the change in the sphere's internal energy in kJ.
Transportation need to evaluate the time spent in traveling from city A to city B. The distance between the two cities is a variable because the macro developed is to be used for other cities.
An air-water vapor mixture at 0.1 MPa, 35 C and 70% relative humidity occupies a volume of 100 m^3 Determine the humidity ratio, the dew point, the mass of dry air in the volume and the mass of water vapor in the volume.
Atrazine is adsorbed to a soil that is only saturated by 5%(i.e. only a twentieth of the pore volume is filled with water), how much atrazine is bound to the soil, dissolved in the water, and present as vapor in the gas phase
What are the effects of hardness, hot strength and hot hardness and work hardening of work materials
An aerosol with a lognormal size distribution has a count median diameter of 2.0 micron and a geometric standard deviation of 2.2. If the mass concentration is 1 mg/cubic meter what is the number concentration
The velocity along a pathline is given by V (m/s) = s^2 x t^(1/2) where s is in meters and t is in seconds. The radius of curvature is 0.5 m. Evaluate the acceleration along and normal to the path at s = 2m and t = 0.5 seconds.
Northern Tundra Telephone (NIT) has received a contract to install emergency phones along a new 100-mile section of the Snow-Moose Turnpike. Fifty emergency phone systems will be installed about 2 miles apart.
A scale for rapidly weighing ingredients in a commercial bakery operation is shown. An empty bowl is first placed on the scale. Electrical contact is made at point A, which illuminates a light indicating the bowl's contents are underweight.
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