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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
Water occupies the bottom 0.8 m of a cylindrical tank.On top of the water is 0.3 m of kerosene, which is open to the atmosphere. If the temperature is 20 degrees C, what is the gage pressureat the bottom of the tank
The wet bulb and dry bulb temperatures for humid atmospheric air (at 100 kPa) are measured to be 20 C and 25C respectively. Determine: a. using the psychrometric chart, the relative humidity b. using the psychrometric chart, the humidity ratio
Assuming the origin is placed where the bullet begins to move, the force (in newtons) exerted by the expanding gas on the bullet is 18000 + 7000x - 20000x2, where x is in meters.
A nozzle is designed to linearly accelerate the fluid from V1 to V2 (i.e., V = ax +b, where a and b are constants). Determine the local acceleration, the convective acceleration, and the total acceleration at point 1 and 2 at t = 0.
A lake with a surface area of 1050 acres was monitored over a period of time. During a one month period, the inflow was 33 cfs, the outflow was 27 cfs, and a 1.5 in seepage loss was measured.
Evaluate company performance in relation to GRI standards and comment on Stigler's theory.
The pipe contains two 6 in steel elbows, two fully open gate valves, a fully open 90o angle valve, and a swing check valve. If the discharge end of the pipe is located 20 ft higher than the entrance, what is the pressure difference between the two..
A truck is designed to measure concrete roughness. During a typical test the driver will bring the vehicle to a constant test velocity, v, and then suddenly lock the brakes bringing the vehicle to a complete stop.
The column is constructed from high-strength concrete and four A-36 steel reinforcing rods. If it is subjected to an axial force of 37.5 kN , determine the required diameter of each rod so that one-fourth of the load is carried by the concrete
A wood board with a 2in. by 4in. cross section is subjected to a tensile load of 100 lb. Determine the average normal stress and average shear stress developed in the wood fibers that are oriented at 30 degrees with the axis of the board.
The aluminum block has a rectangular cross section and is subjected to an axial compressive force of 8kip. If the 1.5-in side changed its length to 1.500132 in., Determine Poisson's ratio and the new length of the 2-in side.
The "Shape Factor" of a cross-section of a beam is defined as the fully plastic strength divided by the force or moment causing first yield. Thus the Shape Factor for bending is Mp/My and similarly for shear, is Vp/Vy.
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