Concept explainers
The useful life of a machine bearing depends on its operating temperature, as shown by the following data. Plot the data and obtain a functional description of the data. Estimate a bearing’s life if it operates at 150°F.
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System Dynamics
- Determine the critical speed for a vehicle with the following parameters; Parameter Value Units Mass 1,451 kg Wheelbase 2.57 Forward weight bias 45 Front axle cornering 67 kN/rad stiffness Rear axle cornering stiffness 67 kN/rad Provide your answer in units of (m/s) to 1 decimal place.arrow_forward1.22 In order to prevent frostbite to skiers on chair lifts, the weather report at most ski areas gives both an air temperature and the wind-chill temperature. The air temperature is measured with a thermometer that is not affected by the wind. However, the rate of heat loss from the skier increases with wind velocity, and the wind-chill temperature is the temperature that would result in the same rate of heat loss in still air as occurs at the measured air temperature with the existing wind. Suppose that the inner temperature of a 3-mm-thick layer of skin with a thermal conductivity of 0.35 W/m K is and the air temperature is . Under calm ambient conditions the heat transfer coefficient at the outer skin surface is about (see Table 1.4), but in a 40-mph wind it increases to . (a) If frostbite occurs when the skin temperature drops to about , do you advise the skier to wear a face mask? (b) What is the skin temperature drop due to the wind?arrow_forward۱۰:۱۳ docs.google.com * Fixed-Fixed bar was 20 centigrade degree at room temperature, Determine the thermal stress when the bar is heated to :110 degree A Lo Est = 200 Gpa = 11.7 μm/m°C ας ast Ast = 200 mm² _187.2 MPa (compression) +187.2 MPa (compression) 210.6 MPa (compression) 210.6 MPa (Tension) + 210.6 MPa (compression) + 210.6 MPa (Tension) +187.2 MPa (Tension) O non of these _187.2 MPa (Tension) (arrow_forward
- Find the value of M1, M2, and what is the percent error if the true value is 149 grams?arrow_forwardWhich of the following formulas describe the thermal efficiency of a cycle? Select all that applies. 1 - qin/qout worknet/qout worknet/qin 1 - qout/qinarrow_forwardS The following are the values of righting levers, in metres, at various angles of inclination for a ship: KN (m) 450 4.70 (Tonne) 7000 10000 15000 20000 25000 00 60° 150 1,86 1.77 1.68 309 3.87 3.66 3.50 3.41 3.42 750 6.22 6.30 6.32 900 5.92 5.96 5.91 5.70 5.36 0.0 5.35 0.0 5.79 0.0 0.0 0.0 4.95 4.85 4.55 4.18 5.86 5.38 4.76 1.63 1.67 6.14 5.92 In a particular condition of loading the displacement is made up as follows: Item Lightship Cargo Fuel Stores Mass (Tonnes) 6000 5900 1300 Kg (m) 8.17 5.02 3.66 100 10.97 Plot the cross curves of stability and from them, draw the curve of statical stability for the given condition. State the range of stability and the maximum GZ. [Ans: 0-75.5°; 0.46 m]arrow_forward
- Draw a figure or FBD that will support the problem. Explain each step by step formula.arrow_forwardCalculate the ankle torque during running pushoff from the following data set to 1 decimal place. NOTE if your answer is negative put the negative sign in the answer! Fz 1720 N Fx 551 N e to search CoP z 0 m Cop x 0.452 m Ankle z 0.143 m Ankle x 0.373 m Answer: Check B B M N Ps 2°C Partly sunnyarrow_forwardF1: 0318, F2: 1,894, M: 8,942arrow_forward
- The surface tension of a fluid is a measure of its resistance to deformation. Select one: True Falsearrow_forwardThe nuchal ligament in a horse supports the weight of the horse’s head. This ligament is much more elastic than a typical ligament, stretching from 15% to 45% longer than its resting length as a horse’s head moves up and down while it runs. This stretch of the ligament stores energy, making locomotion more efficient. Measurements on a segment of ligament show a linear stress-versusstrain relationship until the stress approaches 0.80. Smoothed data for the stretch are shown. The volume of the ligament stays the same as it stretches, so the cross-section area decreases as the length increases. Given this, how would a force F versus change in length ΔL curve appear?arrow_forwardIdentify the equations that go with these concepts: Conservation of Energy (for conservative forces) b. Work-Energy Principle C. Force of gravity for an object near the surface of the Earth Force of gravity for an object far from the surface of the Earth d. T1+ V1 = T2+ V2 T1 + U1->2= T2 F = mg F= (GMm)/r^2arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning