Dimensional Analysis: When dividing several quantities
A. the quantities can have any combination of units.
B. the quantities must all have exactly the same units.
C. the quantities must all be dimensionless.
Answer: A
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(For discussion.) Which do you personally think is the weirdest aspect of quantum mechanics and why?
A. It does not support objectively real quanton properties. B. It requires possibly superluminal connections. C. It has two incompatible time evolution rules. D. There seems to be some kind of unexplained disconnect between microscopic and macroscopic physics.
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
Which element is the dead end for cores of the most massive stars?
A) lead B) oxygen C) uranium D) hydrogen E) iron
It is not possible to increase the efficiency of thermal power plants because of thermodynamics
What will be an ideal response?