A series circuit contains a 12-V battery, a 4.0-W resistor, and a 12-mH inductor. If the switch to the battery is closed at t = 0, find the time required for the current in the circuit to reach 63% of its final value
a. 1.5 ms
c. 4.0 ms
b. 3.0 ms
d. 5.0 ms
B
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A rock bed used for thermal storage has washed rocks of ½ inch nominal diameter. The bed is 5 feet high, 5 feet wide and 8 feet long. One thousand cubic feet per minute (cfm) of air passes vertically through the rock bed. Estimate the convective heat transfer coefficient for the air/rock bed under this flow condition.
What will be an ideal response?
The Hubble Law does not work for nearby galaxies because
A. nearby galaxies are contracting rather than expanding. B. it is difficult to take the spectrum of nearby galaxies as compared to distant galaxies. C. the Hubble law works for all galaxies; distance doesn't matter. D. the speed of nearby galaxies is affected by their gravitational interaction with one another.
According to the principle of continuity, the velocity of a fluid multiplied by the cross section through which it flows at one point will equal the product of
A) velocity and cross section at another point. B) velocity and pressure at another point. C) a constraint factor. D) none of the above
A(n) ______________ is an elementary particle with a charge of +1.6 × 10^-19 C
a. electron b. neutron c. proton d. atom