Determine R if the equivalent spring stiffness constant (keq) of the spring system is 250 N/m R N/m 250 N/m www 250 N/m wwwwwww RN/m R N/m Jwww F
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- Using the information in Problem 1.22, estimate the ambient air temperature that could cause frostbite on a calm day on the ski slopes. 1.22 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 0.35W/mKis35C and the air temperature is 20C. Under calm ambient conditions the heat transfer coefficient at the outer skin surface is about 20W/m2K (see Table 1.4), but in a 40-mph wind it increases to 75W/m2K. If frostbite occurs when the skin temperature drops to about 10C, do you advise the skier to wear a face mask? What is the skin temperature drop due to the wind?Three parallel springs have stiffness constant of 100 N/m each. Determine the spring stiffness equivalent of the springs. 300 N/m 0.01 N/m 100 N/m 33.3 N/massuming that mass = 2150 kg K = 80.98 N/mm C =21.19 N/mm.
- A dumbwaiter 3 m above floor falls freely due to sudden breakage of wire rope carrying it. A coil spring is provided below at level with floor to absorb shock. If spring deflected 30.48 cm. due to gross wright of elevator, 100 kg, determine: a. wire diameter, Dw b. mean diameter of coil, Dm c. number of active coils, Nc Use: C = 8 G = 808720 kg/cm^2A computer is protected against impact by foam packaging (spring stiffness, k = 100 N/cm; mass, m = 11 kg, including packaging). The maximum acceleration that the computer can withstand on impact with a hard surface is 4g. At the maximum acceptable impact acceleration, how much does the packaging compress upon impact? Give the answer in cm. What is the maximum height, h, in cm that the case can fall from without damaging the computer?4p4 a woman who weighs 500N stands on a 9.0m long board that weighs 100N. The board is supported at each end. The support force at the right end is 3 times bigges the support force at the left end. How far from the right end is the woman standing? choose one below: (m) a. 1.6 b. 2.7 c. 2.0 d. 1.8
- A spring is compressed by 0.05 in for every 1 lbf of applied force. Determine the deflection of the same spring when the applied forces is 6.5 lbm .Let go= 32.0 ft/s2Problem 1: A certain rigid aluminum container contains a liquid at a gauge pressure of P0 = 2.02 × 105 Pa at sea level where the atmospheric pressure is Pa = 1.01 × 105 Pa. The volume of the container is V0 = 2.15 × 10-4 m3. The maximum difference between the pressure inside and outside that this particular container can withstand before bursting or imploding is ΔPmax = 2.41 × 105 Pa.For this problem, assume that the density of air maintains a constant value of ρa = 1.20 kg / m3 and that the density of seawater maintains a constant value of ρs = 1025 kg / m3. Part (a) The container is taken from sea level, where the pressure of air is Pa = 1.01 × 105 Pa, to a higher altitude. What is the maximum height h in meters above the ground that the container can be lifted before bursting? Neglect the changes in temperature and acceleration due to gravity with altitude. Part (c) Choose the correct answer from the following options. The depth below the surface of the ocean…Material property of the given system: Tensile strengthσt=11000 daN / cm^2 and Torsional strengthSince τ=5000 daN /cm^2, find the System's Coefficient of Safety (EMF cis) for only point A using the MOH'R circle method?(Dimensions are given on the system) Rod diameter D=4 cm, Rod length L=100 cm, Vertical applied to the rodforce F=500 daN and Torque T=1000 daN cm
- A hydraulic lift is required to lift a load of 98.1 kN through a height of 12 m, once in every 100 seconds. The speed of the lift is 600 mm/s. Determine : (a) power required to drive the lift, (b) working period of lift in seconds, and (c) idle period of the lift in seconds. [Ans. (a) 11.772 kW, (b) 20 sec, (c) 80 sec]Calculate the specific weight, density and specific gravity of one litre of a liquid, which weighs 7N. Select one: 1. 7000 N/m3, 713.5 kg/m3, 0.7135 2. 700 N/m3, 71.35 kg/m3, 0.07135 3. 70 N/m3, 7.135 kg/m3, 0.007135 4. None of the above.1. A non-uniform is 4.5m long and weighs 640N. It is balance when a 270N weight is hung 0.800m from the light end of the bar and the bar is pivoted at its center. Where is the center of gravity of the bar? 2.Two workers carry a non-uniform beam weighing 730N. The beam is 2.6m long and its center of gravity is 1.1 m from one end. If the workers hold the beam at its end, how much does each worker lift?