As the air cools, water-vapor molecules slow down and capacity
A) increases.
B) decreases.
C) outpaces condensation.
D) increases to maximum humidity.
Answer: B
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The nichrome heating element in an electric drier operates on 240 V and generates heat at the rate of 2.0 kW
The heating element shorts out and, in repairing it, the repairman shortens the nichrome wire by 10%. (Assume the temperature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element? A) The power increases to 2.2 kW. B) The power is still 2.0 kW. C) The power decreases to 1.8 kW. D) None of the given answers is correct.
Two solid spheres, both of radius 5 cm, carry identical total charges of 2 µC. Sphere A is a good conductor. Sphere B is an insulator, and its charge is distributed uniformly throughout its volume. How do the magnitudes of the electric fields they separately create at a radial distance of 6 cm compare?
1. EA > EB = 0 2. EA > EB > 0 3. EA = EB > 0 4. 0 < EA < EB 5. 0 = EA < EB
Which of the following could be the molecular formula for an alkene?
a. C5H5 b. C2H4 c. C3H5 d. C9H16 e. C4H10
The flow of groundwater depends on
A) porosity only. B) permeability only. C) porosity and permeability. D) hydraulic gradient, and hydraulic conductivity.