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

Physics & Space Science

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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.

Physics & Space Science

Voltage has the units of ______________, which is called a volt

Fill in the blank(s) with correct word

Physics & Space Science

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

Physics & Space Science

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.

Ariel, because x2- 6.0xt + 9t2 = (x- 3.0t)2.

B.
Ariel, because a pulse is not an infinite wave.

C.
Miranda, because (x- 3.0t)2 is the same as (3.0t- x)2.

D.
Miranda, because a pulse is not an infinite wave.

E.
Miranda, because is infinite when x = 0.

Physics & Space Science