To find the equivalent resistance of the combination of resistors shown across the 28-V battery by the method of possibly repeated applications of combining resistors in series and /or combining resistors in parallel, the first step would be which of the following?
a.
Combine the two 10 ? in parallel since they can be done in your head.
b.
Combine, in series, the two 3-? resistors and the 4-? resistor in the right-hand branch of the circuit.
c.
Combine the seven resistors (two 5 ?, three 3 ?, one 2 ? and one 4 ?) in the outer loop of the circuit in series.
d.
This problem cannot be done by combining series and parallel resistors.
b
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Compare the rate of condensate flow from the pipe in Problem 8.28 (air pressure = 200 kPa) with that for a 3.89-cm-OD pipe and 200 kPa air pressure. What is the rate of condensate flow if the 2 cm pipe is submerged in a 20°C constant-temperature water bath?
GIVEN
• A long horizontal copper pipe carrying saturated steam within an environmental testing chamber or a water bath
• Steam pressure = 120 kPa
• Ambient pressure (P) = 2 atm
• Ambient air or water temperature (T?) = 20°C
FIND
Rate of condensate flow for
(a) Diameter (D) = 3.89 cm = 0.0389 m Fluid is air at 2.0 atm
(b) Diameter (D) = 2 cm = 0.02 m Fluid is water at T? = 20°C
ASSUMPTIONS
• Pressure change has no effect on absolute viscosity, thermal conductivity, or specific heat of the air
• Air is still
• Convective thermal resistance on the inside of the pipe is negligible
• Thermal resistance of the copper pipe is negligible
• The air behaves as an ideal gas
SKETCH
PROPERTIES AND CONSTANTS
For saturated steam at 0.12 MPa, the heat of vaporization (hfg) = 2238 kJ/kg, and the temperature (Ts) = 105°C.
for dry air at the mean temperature of 62.5°C and one atmosphere
Thermal expansion coefficient (?) = 0.00298 1/K
Thermal conductivity (k) = 0.0281 W/(m K)
Prandtl number (Pr) = 0.71 at P = 2.0 Atm,
Kinematic viscosity (?) = 9.83 × 10–6 Ns/m2
Scientists try to form hypotheses that explain how nature works
a. True b. False Indicate whether the statement is true or false
Which of the following expressions gives the correct units for the volt in terms of base SI units?
A. 1 V = 1 kg·m2C–1s B. 1 V = 1 kg·m2A–1s–3 C. 1 V = 1 kg·m·A–1s–1 D. 1 V = 1 kg·m2s–2C–2 E. 1 V = 1 J/C F. Some other expression (specify).
A 50.0-kg block is being pulled up a 16.0° slope by a force of 250 N which is parallel to the slope. The coefficient of kinetic friction between the block and the slope is 0.200. What is the magnitude of the acceleration of the block?
A) 0.528 m/ B) 0.158 m/ C) 0.412 m/ D) 0.983 m/ E) 0.260 m/