A window glass that is 0.5 cm thick has dimensions of 3 m by 1.5 m. The thermal conductivity of this glass is 0.8 W/m ? K
If the outside surface of the glass is at -10°C and the inside surface is at 20°C, how much heat flows through the window in every hour? A) 50 MJ
B) 60 MJ
C) 70 MJ
D) 80 MJ
D
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Which of the following statements best describes the difference between a refracting telescope and a reflecting telescope?
A) A refracting telescope uses a transparent glass lens to focus light, whereas a reflecting telescope uses a mirror to focus light. B) A refracting telescope produces refracted images, whereas a reflecting telescope produces reflected images. C) Reflecting telescopes make much clearer images than refracting telescopes of the same size. D) It is much easier to make a large refracting telescope than a large reflecting telescope.
Voltage has the units of ______________, which is called a volt
Fill in the blank(s) with correct word
A sound wave has a frequency of 850 Hz. What is the sound wave's wavelength if the air temperature is 26.0 °C?
a. 0.41 m b. 2.0 m c. 33 m d. 0.42 m
Ariel claims that a pulse is described by the equation 
where x and y are measured in cm and t in s. Miranda says that it is not possible to represent a pulse with this function because a wave must be a function of x + vt or x?vt. Which one, if either, is correct, and why?
A.
B.
C.
D.
E.
is infinite when x = 0.