The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass. An ordinary glass rod and a Pyrex glass rod of equal lengths at room temperature are dropped into boiling water. The change in length of the ordinary glass rod will be __________ times the change in length of the Pyrex glass rod
Fill in the blank(s) with correct word
three
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The primary coil of a transformer has 100 turns and its secondary coil has 400 turns. If the ac voltage applied to the primary coil is 120 V, what voltage is present in its secondary coil?
A) 70 V B) 30 V C) 100 V D) 400 V E) 480 V
A point source emits sound with a power output of 100 watts. What is the intensity (in W/m2) at a distance of 10.0 m from the source?
a. 7.96 × 10^?2 b. 7.96 × 10^?1 c. 7.96 × 10^0 d. 7.96 × 10^1 e. 7.96 × 10^?3
A monochromatic beam of light in air has a wavelength of 632 nm. It passes through glass (n = 1.52) and then through carbon disulfide (n = 1.63). What is its wavelength in the carbon disulfide?
a. 361 nm c. 895 nm b. 960 nm d. 388 nm
Determine Qnet for the toasting bread in problem 7.9, if the surroundings act as a gray surface with emissivity of 0.45 and temperature of 85ºC.
