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- A cylindrical specimen of a cold-worked brass has a ductility (%EL) of 28%. If its cold-worked radius is 15 mm, what was its radius before deformation? You may need to use Animated Figure 7.19c. [The tolerance is +/- 5%.] mmThe specific reaction rate constant k is a strong function of temperature according to the following equation: 1 In the equation above, the reaction rate constant k is expressed in R is the universal gas constant 8.314- What is the unit of A? O mol m OK Om O J O mol K J mol 01 S Pa.m ³ m k=Axexp- Pa.m³ constant (1.314 P-²). mol. K E RT and T is the absolute temperature in K. The equation is dimensionally homogenous.Creep data of a certain material is given below. If a structural member 18 mm in diameter and 80 mm long made from this material is to be subjected to a tensile load of 30267 N in an 800 °C environment; calculate occurred deformation after 8 hours. Sod C elect one: a.6.40 mm b.66.40 mm c.88.68 mm
- 10:55 > t.myexams.unisa.ac.za MENU E Frag question A. 5.0 x 108 ft³ B. 6.0 x 108 ft³ C. 8.6 x 108 ft³ D. 2.1 x 108 ft³ E. 4.8 x 108 ft³ ||| Vol) 4G LTE2 T The largest building in the world by volume is the Boeing 747 plant in Everett, Washington. It measures approximately 650 m long, 710 yards wide, and 110 ft high. What is its volume in cubic feet? O 47 71% < myExams3. It has been suggested that the surface melting of ices plays a role in enabling speed skaters to achieve peak performance. Carry out the following calculation to test this hypothesis. At 1 atm pressure, ice melts at 273.15 K, AH fusion=6010 J mol-¹, the density of ice is 920 kg m-³, and the density of water is 997 kg m-³. A. What pressure is required to lower the melting point by 4 °C? B. Assume that the width of the skate in contact with the ice has been reduced by sharpening to 19x10-³ cm, and the length of the contact area is 18 cm. If a skater of mass 78 kg is balanced on one skate, what pressure is exerted at the interface of the skate and the ice? C. What is the melting point of ice under this pressure? D. If the temperature of the ice is -4°C, do you expect melting of the ice at the ice-skate interface occur?The yield region for steel that has a normal grain diameter of 3.4x10 2 mm is 280 MPa. At a grain diameter of 8.8x10-3 mm, the yield strength increases to 340 MPa. Calculate the value of K. O a. 11.56 MPa-mm1/2 O b. 11.46 MPa-mm1/2 O c. 11.55 MPa-mm1/2 O d. 11.45 MPa-mm1/2
- (a) Suppose a meter Stick made of steel and one made of invar (an alloy of iron and nickel) are the same length at 0C. What is their difference in length at 22.0C ? (b) Repeat the calculation for two 30.0mlong surveyor's tapes.2. An aluminum alloy sheet 10 cm x 10cm x 2 mm thick having a 0.2%-offset yield strength of 375 MPa is loaded in biaxial tension, o, = 100 MPa and a, 150 MPa. a. Calculate the change in length in the x-direction. b. Calculate the change in length in the y-direction. c. Calculate the change in thickness (2-direction). d. Calculate the change in volume. Give sign and magnitude of the above changes.In an experiment to measure the specific heat capacity of Aluminum three values, 0.25 Cal/gm.Co, 0.20 Cal/gm.Co, 0.19 Cal/gm.Co, are determined, the percent error of their mean is: (Given that the accepted value of is 0.22 Cal/gm.Co) a. 4.5% b. 3.0 % c. 5.5% d. 7.2%
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