How much heat is required to melt 3.0 kg of ice at 0°C to water at 0°C?
a. 240 kcal
b. 0 kcal
c. 1620 kcal
d. 360 kcal
a
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When a switch is closed, completing an LR series circuit, the time needed for the current to reach one half its maximum value is ____ time constants
a. 0.250 b. 0.500 c. 0.693 d. 1.00 e. 1.44
in the jet’s direction of motion, which part of the airplane becomes negatively charged?
A. Its nose B. Its tail C. Its top D. Its bottom E. Its left wing F. Its right wing T. (No part becomes charged.)
A certain utility transformer is designed to step up the emf from 1 kV to 25 kV. If the primary has 1000 turns of wire, how many turns of wire does the secondary have?
A. 25,000 B. 4000 C. 2500 D. 40 E. 25 F. Some other result (specify). T. One needs more information to answer.
A transformer can only operate if _________
a. the power in equals the power out b. the potential difference is large enough c. a.c. is used d. we step up the voltage