Consider the circuit below. Switch S is closed at t = 0
What is the voltage across the capacitor
C long after the switch is closed?
1.0
2.1 V
3.2 V
4.3 V
5.4 V
6.5 V
7.6 V
8.9 V
9.None of the above
10.Impossible to determine
7
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The ceiling of a tract house is constructed of wooden studs with fiberglass insulation between them. On the interior of the ceiling is plaster and on the exterior is a thin layer of sheet metal. A cross section of the ceiling with dimensions is shown below. (a) The R-factor describes the thermal resistance of insulation and is defined by: R-factor = L/keff = ?T/(q/A) Calculate the R-factor for this type of ceiling and compare the value of this R-factor with that for a similar thickness of fiberglass. Why are the two different? (b) Estimate the rate of heat transfer per square meter through the ceiling if the interior temperature is 22°C and the exterior temperature is –5°C.
GIVEN
FIND
ASSUMPTIONS
- Steady state heat transfer
- One dimensional conduction through the ceiling
- Thermal resistance of the sheet metal is negligible
SKETCH
PROPERTIES AND CONSTANTS
Pine or fir wood studs (kw) = 0.15 W/(m K) at 20°C
Fiberglass (kfg) = 0.035 W/(m K) at 20°C
Plaster (kp) = 0.814 W/(m K) at 20°C
When a spring is compressed, its mass increases
Indicate whether the statement is true or false
A capacitor is charging in a simple RC circuit with a dc battery. Which one of the following statements about this capacitor is accurate?
A) There is a magnetic field between the capacitor plates because charge travels between the plates by jumping from one plate to the other. B) There is no magnetic field between the capacitor plates because no charge travels between the plates. C) There is a magnetic field between the capacitor plates, even though no charge travels between them, because the magnetic flux between the plates is changing. D) There is a magnetic field between the capacitor plates, even though no charge travels between them, because the electric flux between the plates is changing. E) The magnetic field between the capacitor plates is increasing with time because the charge on the plates is increasing.
If the temperature of an ideal gas is increased from 20°C to 40°C, by what percent does the speed of the molecules increase?
A) 3% B) 30% C) 70% D) 100%