A steel rod 20 mm in diameter and 120 mm long is joined to the end of a copper rod 20 mm in diameter and 80 mm long, thus forming a composite rod of 200 mm in length. If the ends of the composite rod are now clamped, calculate the stress set up in the steel and copper due to a temperature increase.
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- In the figure below, a metal bar sitting on two parallel conducting rails, connected to each other by a resistor, is pulled to the right at a constant speed. The resistance R = 6.00 Q, the distance between the rails is { = 1.20 m, and a uniform 2.30 T magnetic field is directed into the page. At what speed (in m/s) should the bar be moved to produce a current of 0.500 A in the resistor? R Fapp m/sA spring with a 4 kg mass is resting on a horizontal frictionless table and is attached to a wall at the left end. It will stretch 0.5 m beyond its natura length when a force of 14 N is applied. If the spring begins at the equilibrium position and is pushed to the right with an initial velocity of 2 m/s, fin the position of the mass after t seconds. (Assume that movement to the right is the positive x direction.) x(e) 0.756 sin(2.6461) × Graph the position function of the mass. Χ xTwo masses are connected to a string and hung on a pulley to make an atwood machine. The masses are different values such as M > m. The setup is shown. Assume the string is massless and the pulley is ideal. When the masses are gently released, there is a resulting acceleration. Which of the following equations will calculate the mass of m in the system if the big mass and acceleration are known? A) m = 2M(a/g). B) = m 2M(g/a). C) m = M(g- a/g+a). D) m = M(g+a/g -a).
- One kg of water within a piston-cylinder assembly executes a Carnot power cycle. During isothermal expansion, the water is heated from a saturated liquid at 50 bar until is a saturated vapor. The vapor then expands adiabatically to a pressure of 5 bar and a quality of 0.8291. a) Sketch the cycle on P-v and T-s diagram. b) Evaluate the heat transfer and wor for the above processes (isothermal expansion and adiabatic expansion) c) Evaluate the thermal efficiency.A film of soapy water (n = 1.33) on top of a sheet of Plexiglas (n = 1.51) has a thickness of 176 nm. What wavelength is most strongly reflected if it is illuminated perpendicular to its surface? (This is the apparent color of the soapy film.) 77.48 × What is thin film interference? How many phase shifts are there? What is the condition for destructive interference? nm Additional Materials Reading= The figure shows a horizontal beam of mass M = 59.1 kg and length L = 6.4 m supported at its left end by a frictionless pin and at the other end by an ideal cable attached to wall h 4 m above the beam. A mass m = 22.1 kg is suspended from the beam a distance d = 2 m from the wall. Find the tension in the cable. T h d→ m M L = _ N Report your numerical answer below, assuming three significant figures. Remember to include a as necessary.
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- The accompanying data on cube compressive strength(MPa) of concrete specimens appeared in the article“Experimental Study of Recycled Rubber-FilledHigh-Strength Concrete” (Magazine of ConcreteRes., 2009: 549–556):112.3 97.0 92.7 86.0 102.099.2 95.8 103.5 89.0 86.7 a. Is it plausible that the compressive strength for thistype of concrete is normally distributed? b. Suppose the concrete will be used for a particularapplication unless there is strong evidence that trueaverage strength is less than 100 MPa. Should theconcrete be used? Carry out a test of appropriatehypotheses.A 1.4-kg decoration hangs from the three wires as shown in the figure. The wire on the left makes an angle ax = 66.5° with the ceiling. The wire on the right makes an angle B-37.11° with the ceiling. The wire on the left has a tension that is twice that of the tension in the wire on the right. Part A What is the tension in the vertical wire attached to the decoration? This value is used in the next part, so use 4 significant digits. FT Value Submit Request Answer Part B ? Units a BAMT, Inc., is considering the purchase of a digital camera for maintenance of design specifications by feeding digital pictures directly into an engineering workstation where computer-aided design files can be superimposed over the digital pictures. Differences between the two images can be noted, and corrections, as appropriate, can then be made by design engineers. Solve, a. You have been asked by management to determine the PW of the EVA of this equipment, assuming the following estimates: capital investment = $345,000; market value at end of year six = $120,000; annual revenues = $120,000; annual expenses = $8,000; equipment life = 6 years; effective income tax rate = 50%; and after-tax MARR = 10% per year. MACRS depreciation will be used with a five-year recovery period. b. Compute the PW of the equipment’s ATCFs. Is youranswer in Part (a) the same as your answer in Part (b)?