A 8.0 ?F capacitor is connected in series with a 6.0 k? resistor across a 20-V DC source and a switch. What is the time constant of this RC circuit?

A)

9.0 ms
B)

12 ms
C)

40 ms
D)

18 ms
E)

48 ms


E

Physics & Space Science

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A circumferential steel fin is 8 cm long, 3 mm thick, and is on a 20 cm diameter rod. The surrounding air temperature is 20ºC and h = 35 W/m^2K, while the surface temperature of the rod is 300ºC. Determine a) Fin Efficiency and b) Heat transfer from the fin.

What will be an ideal response?

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Answer the following statement true (T) or false (F)

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Which of the following is not an inertial reference frame?

A) a reference frame that is rotating at a constant rate B) a reference frame that is moving downward at a constant speed C) a reference frame that is moving westward at 10 km/s D) a reference frame that is motionless E) a reference frame that is moving upward at a constant speed

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The magnetic field amplitude in an electromagnetic wave in vacuum is related to the electric field amplitude by B =

A.

.

B.
.

C.
E.

D.
.

E.
cE.

Physics & Space Science