Why so much emphasis upon units? Why are units considered to be as important as the quantity, "magnitude", of something?
What will be an ideal response?
Just knowing the magnitude of something is not complete information (in fact it is ambiguous) unless one also knows the units. For example, learning that you will earn 150 for a certain task might mean 150 dollars, or perhaps 150 cents, or 150 pesos. The magnitude is almost worthless without the unit in which it is expressed.
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A stepped steel shaft (G 5 75 GPa) with diameters d1 5 36 mm and d2 5 32 mm is twisted by torques T at each end. Segment lengths are L1 5 0.9 m and L2 5 0.75 m. If the allowable shear stress is 28 MPa and maximum allowable twist is 1.8°, the maximum permissible torque is approximately:
(A) 142 N?m
(B) 180 N?m
(C) 185 N?m
(D) 257 N?m
The Sun's evolution from youngest to oldest stage is
A. protostar, red giant, main sequence, white dwarf. B. white dwarf, red giant, main sequence, protostar. C. protostar, main sequence, red giant, white dwarf. D. red giant, main sequence, white dwarf, protostar.
In color photos, spirals typically have ________ arms with pink H II regions
Fill in the blank(s) with correct word
An ideal gas undergoes an adiabatic process while doing 25 J of work. What is the change in internal energy?
A) zero B) 50 J C) 25 J D) -25 J E) none of the above