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For the image of the tennis raquet, ladder and wind turbine addeed below; discuss how the item might have failed and the likelihood of the cause of the failure.
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- 2.26. The kinetic theory of gases predicts that the thermal conductivity of a gas equals the product of the heat capacity at constant volume times the viscosity; this theory also predicts that the viscosity varies as the square ot of temperature and is independent of pressure. For CO, at 1 atm and 273.15 K, the following dat a available: are Cy = 0.640 kJ kg-' K- H = 1.38 x 10-S N sm-2 k= 0.01435 Wg'K- Assuming that q, is proportional to the first power of absolute temperature, estimate k at 300 K and 1 atm. Find the percent error of your estimate based on the literature value of 0.01655 W m-' K-'.A flagpole of mass 10.0 kg and length 3.00 m is supported on one end at a wall, and on the other by a cable, as shown below. A student of mass 80.0 kg hangs on a rope attached 1.00 m from the right end of the flagpole. 30° cable 3.00 m 1.00 m a) Draw a free body diagram of the flagpole b) Determine the magnitude of the tension T in the cable c) A force is exei ted on the flagpole from the wall – indicate the general direction of this force on your free body diagram [State your final answers for part b) using appropriate significant digits.]THREE CYLINDERS ARE PILED IN A RECTANGULAR DITCH AS SHOWN. NEGLECTING FRICTION, DETERMINE THE REACTION BETWEEN THE BOTTOM CYLINDER AND a) THE VERTICAL WALLL b) THE HORIZONTAL FLOOR. R = 0.50 R = 0,60 20 N R = 0.40 %3D 40 N 15 N 1.80
- 30 C A barge is pulled by two tugboats. If the resultant of the forces exerted by the tugboats is 5000 lbf directed along the axis of the barge, determine a) the tension in each of the ropes for a = 45°, b) the value of a for which the tension in rope 2 is a minimum. 2007 The2.20 The drag force, Fa, imposed by the surrounding air on a vehicle moving with velocity V is given by F₁ = C₁A=pV² where C₁ is a constant called the drag coefficient, A is the projected frontal area of the vehicle, and p is the air density. Determine the power, in hp, required to overcome aerodynamic drag for an automobile moving at (a) 25 miles per hour, (b) 70 miles per hour. Assume C₁ = 0.28, A = 25 ft², and p 0.075 lb/ft².Q5) Method of Joints The structure on the right is in static equilibrium. It is constructed using two-force members, joined at their ends. I have given you all the external forces acting on the structure. You do not need to find reaction (support) forces. a) Label every member as tension T, compression C, or zero-force Z. Draw arrows on every non-zero member to indicate the direction of the tension or compression forces. b) Use the Method of Joints to calculate the magnitude of forces F1 , F2 , and F3. Follow the recipe and show all your work. Clearly draw free-body-diagrams and write Newton’s 2nd law for every joint you study.
- 1.162. A horizontally flying bullet of mass m gets stuck in a body of mass M suspended by two identical threads of length 1 (Fig. 1.42). As a result, the threads swerve through an angle 0. Assuming m << M, find: (a) the velocity of the bullet before striking the body; (b) the fraction of the bullet's initial kinetic energy that turned into heat. 12 M Fig. 1.42. 24.5.53 Suppose earthquake A registers four more points on the Richter scale than earthquake B. a. How are their corresponding intensities related? b. How are their released energies related? a. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. A = B - 'B В. ТА Oc. 'A B O D. A = B +5. (15 pts) The owner of a parking garage located in a CBD has observed that 25 percent of those wishing to park are turned back every day during the open hours of 7 a.m. to 7 p.m. because of a lack of parking spaces. An analysis of data collected at the garage indicates that 56 percent of those who park are commuters, with an average parking duration of 9 hr, and the remaining percentage are shoppers, whose average parking duration is 3 hr. If 15 percent of those who cannot park are commuters and the rest are shoppers, and a total of 320 vehicles currently park daily in the garage, determine the number of additional spaces required to meet the excess demand. Assume parking efficiency is 0.90.
- answer all parts(d) Four 1.9e-08 C charges are held in location to form a perfect square with sides of length 0.1 m. Two of the charges from opposing corners are released simultaneously, the other two are held in place. The mass of each charge is 0.003 kg. How fast (in m/s) will the two released charges be moving when they are far, far away from their original location? a)0.339 b)0.476 c)0.226 d)0.196 e)0.0881 f)0.736 Pls answer part (d) completely and show all the steps. Thanks!-:) To replace the regular light bulb with a high-efficiency light bulb, what is the upper price limit to make the high-efficiency light bulb economically attractive? (Ignore the interest rate.) (Electricity: $0.15/kWh) (a) 3.25 (d) 5.00 Type of light bulb Regular High-efficiency (b) 4.21 (e) 23.8 Cost ($/piece) 1.00 ? Power (W) 100 15 Life time (hours) 2000 1800 (c) 46.2 I
