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Arturiano [62]
3 years ago
3

An instrumentation package has a spherical outer surface of diameter D = 100 mm and emissivity ε = 0.25. The package is placed i

n a large space simulation chamber whose walls are maintained at 77 K. If operation of the electronic components is restricted to the temperature range 40 ≤ T ≤ 85°C, what is the range of acceptable power dissipation for the package? Display your results graphically, showing also the effect of variations in the emissivity by considering values of 0.20 and 0.30.
Engineering
1 answer:
ad-work [718]3 years ago
3 0

Answer:

Q=4.3 to 7.3 W

Explanation:

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True

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3 years ago
A 10-V-emf battery is connected in series with the following: a 2-µF capacitor, a 2.0-Ω resistor, an ammeter, and a switch, init
Jet001 [13]

Answer:

I = 5.0 A  V=0

Explanation:

Assuming that the ammeter is an ideal one (which means that the internal resistance is negligible compared with other resistors in the circuit), as the voltage through the capacitor can't change instantaneously, just after the switch is closed, will behave like a short, so applying Ohm's law, the current in the circuit will be as follows:

I =\frac{V}{R} = \frac{10 V}{2.0 \Omega}  = 5.0 A

As the voltage in the capacitor, can't change instantaneously, assuming an ideal voltmeter (infinite resistance) , the lecture on the voltmeter across the capacitor will be just 0.

As time goes by, the voltage measured will follow the following equation:

V = V0*( 1-e^{-\frac{t}{R*C}} )

We see that when t=0, V=0.

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Answer:

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Explanation:

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