A metal rod is placed between two temperature sources so that heat can flow between them. One temperature is 90.0
and the other temperature is 25.0
The length of the rod is 30.0 cm and the cross sectional area is 10.0 cm2 . If 15.0 watts of heat flows between the hot temperature and the cold temperature, then what is the coefficient of thermal conductivity for the metal?
A. 69.2 W/m•
B. 58.2 W/m•
C. 50.4 W/m•
D. 46.3 W/m•
E. 44.2 W/m•
A. 69.2 W/m•
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Single-Slit Diffraction: A beam of light of wavelength 630 nm is incident on a slit that is 0.400 mm wide. If the distance between the slit and the screen is 1.80 m, what is the width on the screen of the central bright fringe?
A. 1.94 mm B. 2.94 mm C. 3.54 mm D. 5.67 mm E. 6.94 mm
In your own words, explain what we mean by spacetime
What will be an ideal response?
An electron is confined in a one-dimensional box (an infinite well)
Two adjacent allowed energies of the electron are 1.068 × 10-18 J and 1.352 × 10-18 J. What is the length of the box? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 1.9 nm B) 0.93 nm C) 1.1 nm D) 2.3 nm
All things being practically equal, if the energy content in gasoline were doubled, then the distance a car should travel per liter of gasoline should
1) be no different. 2) double. 3) quadruple. If the low-energy and high-energy fuels are burned in the same time, then compared to the POWER produced by combustion of the low-energy gasoline, the power produced by the combustion of the higher-energy gasoline should 4) be no different. 5) double. 6) quadruple.