A cylindrical tank is assembled by welding steel sections in a heli-cal pattern with angle ? 5 50°. Tank diameter is 1.6 m, thickness is 20 mm, and internal pressure is 2.75 MPa. Modulus E 5 210 GPa and Poisson’s ratio ? 5 0.28. The normal stress acting perpendicular to the weld is approximately:
(A) 39 MPa
(B) 48 MPa
(C) 78 MPa
(D) 84 MPa
(C) 78 MPa
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Which of the following is an example in which you are traveling at constant speed but not at constant velocity?
A) rolling freely down a hill in a cart, traveling in a straight line B) driving backward at exactly 50 km/hr C) driving around in a circle at exactly 100 km/hr D) jumping up and down, with a period of exactly 60 hops per minute E) none of the above
A 150-W lamp is placed into a 120-V ac outlet. What is the peak current?
A) 0.80 A B) 0.88 A C) 1.2 A D) 1.8 A
Which of the following best describes the image from a plane mirror?
a. virtual and magnification equal to one b. real and magnification equal to one c. real and magnification less than one d. virtual and magnification greater than one
The concept of molecules:
a. helps model how the law of definite proportions might work. b. proves the law of definite proportions. c. is unrelated to the law of definite proportions. d. violates the law of definite proportions. e. supports the Aristotelian concept of four basic elements.