Which of the following species is the oxidizing agent?
2 CuBr ? 2Cu + Br2
A) Cu
B) CuBr
C) Cu+
D) Br-
E) Br2
Answer: C
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A turbine blade made of Udimet 700 must be able to operate at a temperature of 1000°C (1832°F) for a time of 10,000 h between inspections. What is the maximum tensile stress for this blade based upon high-temperature creep rupture?
What will be an ideal response?
A prismatic shaft (diameter d0 5 19 mm) is loaded by torque T1. A stepped shaft (diameters d1 5 20 mm and d2 5 25 mm with radius of fillets R 5 2 mm) is loaded by torque T2. The allowable shear stress in the material is 42 MPa. The ratio T1/T2 of the maximum permissible torques that can be applied to the shafts, considering stress concentration effects in the stepped shaft is:
(A) 0.9
(B) 1.2
(C) 1.4
(D) 2.1
You whirl a 2-kg body attached to a 1 meter cord around your head in a nearly horizontal circle with a speed of 4 m/s. The tension in the cord is _________
Fill in the blank(s) with correct word
Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 2 sin (4x) cos (3t) where x is in m and t is in s. What is the speed (in m/s) of the interfering waves?
a. 0.75 b. 0.25 c. 1.3 d. 12 e. 3.0