If a star were moved 10 times farther away, its absolute magnitude would drop five magnitudes
Indicate whether the statement is true or false
FALSE
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Ideal Gas Law: A laboratory vacuum pump can reduce the pressure in a chamber to 1.0 × 10-7 Pa. If the volume of the chamber is 0.500 m3 and the temperature is 27°C, how many molecules are left inside the chamber? (NA = 6.022 × 1023 molecules/mol, R = 8.31 J/mol ? K)
A. 1.2 × 1013 B. 2.4 × 1013 C. 1.2 × 1012 D. 2.4 × 1012 E. 1.2 × 1014
Process of Science: The theory of thermal radiation says that hot objects are bluer than cool objects. Does it depend on what the object is made of? How can you test this?
What will be an ideal response?
RMS and Peak Quantities: The current through a 50-? resistor is I = (0.80 A) sin(240t), where t is measured in seconds. What is the rms current?
A. 0.57 A B. 0.80 A C. 1.1 A D. 1.6 A
A 2.0-m2 Thermopane window is constructed, using two layers of glass 4.0 mm thick, separated by an air space of 5.0 mm. If the temperature difference is 20°C from the inside of the house to the outside air, what is the rate of heat flow through this window? (Thermal conductivity for glass is 0.84 W / m •°C and for air 0.0234 W / m •°C.)
a. 7700 W c. 180 W b. 90 W d. 550 W