True or False? It’s possible for a slowing car to have a positive acceleration
1.False
2.True
2
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In order to conserve energy, the inner surface of double-glazed windows are treated with a low emissivity coating that reduces the emissivity of the uncoated surface from 0.95 to 0.5 for the coated surface. If the temperatures of the two glass panes are 20°C and 0°C, respectively, determine the reduction in heat transfer in a coated double-glazed window as compared with the uncoated one.
GIVEN • Double glazed windows treated with low emissivity coating that reduce emissivity of uncoated surface from ?1 =0.95 to ?2= 0.5. • Temperature of glass pane 1 (T1)= 200C = 293 K • Temperature of glass plane 2 (T2) = 00C = 273 K FIND Reduction in heat transfer in coated double glazed window as compared to uncoated one. PROPERTIES AND CONSTANTS the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
__________are electromagnetic waves with wavelength shorter than ultraviolet (UV) light
A) Visible rays B) X-rays C) Microwaves D) Radio waves
What determines the identity of a chemical element?
A. the number of protons in the nucleus B. the number of neutrons in the nucleus C. the number of electrons orbiting the nucleus D. All of these choices are correct.
A person with normal eyesight uses a converging lens of focal length 10 cm. He holds the lens close to his eyes to finish an engraving job
(a) What is the magnifying power of the lens? (b) At what distance from the job he must hold the lens?