A drive shaft resists torsional shear stress of ?xy 5 40 MPa and axial compressive stress ?x 5 70 MPa. One principal normal stress is known to be 38 MPa (tensile). The stress ?y is approximately:
(A) 23 MPa
(B) 35 MPa
(C) 62 MPa
(D) 75 MPa
(A) 23 MPa
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A piece of rope is pulled by two people in a tug-of-war. Each exerts a 400-N force. What is the tension in the rope?
A) zero B) 400 N C) 600 N D) 800 N E) none of the above
Although the energy per coulomb of a high-voltage party balloon is high, the energy transfer that occurs if you touch it is low due to
A) the relatively small amount of charge. B) rubber being a poor conductor. C) the small electric potential. D) all of the above
Which of the following will not influence the rate at which nuclear reactions will occur in a nuclear power plant where the fuel elements are a mixture of 235U and 238U?
a. the presence of moderating material b. the presence of control rods c. the percentage of 235U relative to 238U d. the percentage of the energy that is used to produce electricity
When you interchange your emitter for one with a smaller work function, you measure