A steel lift column in a service station is 4.0 m long and 0.20 m in diameter. Young's modulus for steel is 20 × 1010 N/m2. By how much does the column shrink when a 5000-kg truck is on it?
A)
4.7 × 10-7 m
B)
8.0 × 10-7 m
C)
3.2 × 10-6 m
D)
7.8 × 10-6 m
E)
3.1 × 10-5 m
E
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Which of the following statements about scientific theories is false?
A) Theories are not taken seriously if they contradict older, more developed, theories. B) A theory is a model designed to explain a number of observed facts. C) If even a single new fact is discovered that contradicts what we expect according to a particular theory, then the theory must be revised or discarded. D) A theory must make predictions that can be checked by observation or experiment. E) A theory can never be proved beyond all doubt; we can only hope to collect more and more evidence that might support it.
When a diffraction grating having 5000 lines/cmis illuminated by monochromatic light, the angle between the central maximum and the fourth order maximum is 47.2°. What is the wavelength of the light?
A) 367 nm B) 183 nm C) 138 nm D) 637 nm
According to the nebular theory, where should jovian planets form?
A) in the cold outer regions of the disk, where rocks, metals, and ices can condense B) within the inner few AU of the disk, where only rocks and metals can condense C) at the inner edge of the planet forming disk, where even metal and rock evaporate
The vertical columns of elements in the periodic table are called
a. periods. b. groups. c. families. d. series.