What is the approximate surface temperature of a B star?
A) 8,000 K B) 6,000 K C) 20,000 K D) 40,000 K
C
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One side of a normal outlet is at 120 V AC, the other side is at
A) -120 V AC. B) 0 V. C) 240 V. D) 120 V AC. E) +120 V AC.
A vertical cylinder with a movable cap is cooled. The process corresponding to this is:
A charge of 20 nC is distributed uniformly along the x axis from x = ?2.0 m to x = +2.0 m. What is the electric potential (relative to zero at infinity) at the point x = 5.0 m on the x axis?
A. 57 V B. 48 V C. 38 V D. 67 V E. 100 V
A composite material is made from a 7075-T6 aluminum matrix with 50 % uniaxial alumina fibers. The yield strength of the aluminum is 500 MPa, and the elastic modulus is 70 GPa. The tensile strength of the alumina fibers is 1.4 GPa, and the elastic modulus is 380 GPa.
(a) Calculate the strain where the first change in elastic modulus occurs for this composite material in an axial tensile test. (b) Calculate the composite stress where the change in elastic modulus occurs.