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Question 1: It is observed that snow lies stably on roofs with a slope of less than 24°, but that it slides off roofs with a greater slope. Skiers, on the other hand, slide on a snow-covered mountainside with a slope of only 2°. Why is this?
Question 2: A person of weight 100 kg standing on skis 2 m long and 0.10 in wide slides on the 2° mountain slope, at 0°C. Calculate the loss of potential energy when the ski slides a distance equal to its own length. Hence calculate the average thickness of the water film beneath each ski. (The latent heat of fusion of ice is 330 MJ m-3)
Question 3: Give examples, from your own experience, of situations where friction is (a) desirable, and (b) undesirable.
Question 4: Give examples, from your own experience, of situations where wear is (a) desirable, and (b) undesirable.
Plot the lift and drag forces exerted on an airfoil as a function of velocity. Use velocity values going from 0 to 45 m/s on a log-linear plot (log-scale on the y axis).
which of these two processes will produce the largest amount of work? (You must provide a full explanation for your choice).
Helium enters subsonically and flows isentropically through the converging-diverging duct. Compare the values of Ma, T/T0, and P/P0 for helium with those for air at several locations in the duct. Use 0.163 ≤ Ma ≤ 3.221.
Two infinite parallel plates are separated by a distance h. The space between them is filled with a Newtonian fluid: density (rho), viscosity (mu). The lower plate is fixed
Your engineering firm decides to build a prototype, and needs screw and nut fasteners as well as resistors and LEDs. There are machinists and electronics technicians available for in-house production. What is the most cost-effective way of acquiri..
Design value for the molded friction material and steel disks to be used 0.06 and pressure max=1400kpa. Determine appropriate values for the disk inside dimmeter, the total number of disks and the actuating force?
a hot dog can be considered to be a cylinder 12 cm long and 2 cm in diameter whose properties are rho 980 kgm3 cp 3.9
Describe the four incorrect assumptions concerning robot - arm movement that are most frequently responsible for impact accidents.
A circular shaft is subjected to a torque Ta and a bending moment Ma. Assuming that the diameter of the shaft is d, determine the expressions for the principal stresses and maximum shear stress in terms of Ma, Ta and d.
Define dynamic viscosity, Determine the centroid, Pressure due to the height of liquid, Advantage of changing the liquid, Calculate the total moment about the hinge of the seal gate.
Calculate spring coefficient k = P/δ and discuss the design on how much spring radius r should be changed to increase k two times
determine the smallest horizontal force required to pull out wedge a. the crate has a weight of 200 and the coefficient
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