An individual sulfur atom has twice the weight of an individual oxygen atom. What is the weight ratio of sulfur and oxygen in the formation of sulfur dioxide?
A) 1 part sulfur to 2 parts oxygen
B) 1 part sulfur to 1 part oxygen
C) 2 parts sulfur to 1 part oxygen
D) 1 part sulfur to 4 parts oxygen
E) 4 parts sulfur to 1 part oxygen
B
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When we consider a thin horizontal layer of the atmosphere, of thickness dy, of area A, with pressure P on the bottom, with an average mass m per molecule, and nV molecules per unit volume, the magnitude of the difference of the pressure at the top and bottom of the layer is given by dP =
a. mgdy. b. mgnVdy. c. mgAdy. d. mgnVAdy. e. mgnVAPdy.
Why is there a lower end to the main sequence?
What will be an ideal response?
A planet whose distance from the Sun is 3 AU would have an orbital period of how many Earth-years?
A) 3 B) C) D) 9 E) 81
A 50-cm wire placed in an east-west direction is moved horizontally to the north with a speed of 2.0 m/s
The horizontal component of the earth's magnetic field at that location is 25 ?T toward the north and the vertical component is 50?T downward. What is the emf induced between the ends of the wire? A) 10 µV B) 20 µV C) 30 µV D) 40 µV E) 50 µV