A 2.00-m long metal wire is formed into a square and placed in the horizontal xy-plane
A uniform magnetic field is oriented at 30° above the horizontal with a strength of 0.344 T. What is the magnetic flux through the square due to this field?
A) 0.172 T ? m2 B) 0.0430 T ? m2 C) 0.0745 T ? m2 D) 0.298 T ? m2
B
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A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. At the moment contact is made with the battery
(a) the voltage across the capacitor is A. equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero. (b) the voltage across the resistor is A. equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero.
An electronic device is cooled by passing air at 27°C through six small tubular passages in parallel drilled through the bottom of the device in parallel as shown. The mass flow rate per tube is 7 × 10–5 kg/s. Heat is generated in the device resulting in approximately uniform heat flux to the air in the cooling passage. To determine the heat flux, the air outlet temperature is measured and found to be 77°C. Calculate the rate of heat generation, the average heat transfer coefficient, and the surface temperature of the cooling channel at the center and at the outlet.
GIVEN
• Air flow through small tubular passages as shown above
• Air temperature
? Entrance (Tb,in) = 27°C
? Exit (Tb,out) = 77°C
• Mass flow rate per passage (m )= 7 × 10–5 kg/s
• Number of passages (N) = 6
FIND
(a) The rate of heat generation ( Q
G) (b) The average heat transfer coefficient ( h c) (c) Cooling channel surface temperature at the center (Ts,c) (d) Cooling channel surface temperature at the outlet (Ts,out)
ASSUMPTIONS
• Steady state
• Uniform heat generation
• Uniform heat flux to the air
• Viscosity variation is negligible
• Heat transfer coefficient is approximately constant axially
PROPERTIES AND CONSTANTS
for dry air at the average bulk temperature of 52°C
Specific heat (c) = 1016 J/(kg K) ]
Thermal conductivity (k) = 0.0273 W/(m K)
Absolute viscosity (?) = 19.593 × 10–6 (Ns)/m2
Prandtl number (Pr) = 0.71
A wave moves in a rope with a certain wavelength. A second wave is made to move in the same rope with twice the wavelength of the first wave. The frequency of the second wave is half the frequency of the first wave
Indicate whether the statement is true or false
A __ is a large geographic area with a climate that supports distinctive plant and animal groups.
Fill in the blank(s) with the appropriate word(s).