Thermal Expansion: The volume coefficient of thermal expansion for gasoline is 950 × 10-6 K-1. By how many cubic centimeters does the volume of 1.00 L of gasoline change when the temperature rises from 30°C to 50°C?

A. 6.0 cm3 
B. 12 cm3 
C. 19 cm3 
D. 37 cm3 


Answer: C

Physics & Space Science

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A) 295 K. B) 68 K. C) 68°C. D) 50°C.

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A brass wire 2.0 m long and 2.0 mm in diameter supports a 10.0-kg fixture. By what distance did this fixture stretch the wire? Young's modulus for brass is 10 × 1010 N/m2

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What is fluorescence?

a. The emission of light by electrons that have absorbed several infrared photons to reach a higher energy level, before falling down to a lower level. b. Emission of ultraviolet light by passing an electric current through mercury vapor, for example in a fluorescent light bulb. c. Emission of light by electrons in atoms that have absorbed an ultraviolet photon and stayed for some considerable time at higher energy levels before dropping down. d. Emission of light by electrons in atoms after they have absorbed an ultraviolet photon and then dropped down through several energy levels, emitting light in one or more of the steps. e. Light emitted by electrons in atoms after they have absorbed several infrared photons and stayed in the excited state after the infrared light was turned off.

Physics & Space Science