Metal lids on glass jars can often be loosened by running them under hot water. Why is this?
a. The hot water is a lubricant.
b. The metal and glass expand due to the heating, and the glass being of smaller radius expands less than the metal.
c. The metal has a higher coefficient of thermal expansion than glass so the metal expands more than the glass, thus loosening the connection.
d. This is just folklore.
C
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A transverse periodic wave is represented by the equation z(y, t) = 1.50 cm sin(1,250 rad/s t + 10.0
What is the direction of the vibration of the wave?
A. the x direction B. the y direction C. the z direction
A perfectly black sphere 18.0 cm in diameter is held at a temperature of 215°C. (? = 5.670 × 10-8 W/m2 ? K4, Wien displacement law constant is 2.90 × 10-3 m ? K, h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)
(a) Near what wavelength does this sphere radiate most strongly? (b) If all the radiated energy were at the wavelength found in part (a), how many photons would the sphere emit each second? What will be an ideal response?
When a gas in a container is squeezed to half its volume with no change in temperature, the gas pressure
A) halves. B) doubles. C) quadruples. D) remains the same.
What is the angular separation of two spectral lines of wavelengths 497 nm and 251 nm formed in the third order with a grating having 587 lines per millimeter?
A) 34.8° B) 24.8° C) 41.3° D) 29.4° E) 4.21°