Speed can sometimes be negative
Indicate whether the statement is true or false
T
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A lightbulb is connected to a 120 V(rms), 60 Hz source. How many times per second does the current reverse directions?
A. 60 B. 130 C. 120 D. 30
If the AA designation of an alloy has three digits, it is a(n) _________alloy.
Fill in the blank(s) with the appropriate word(s).
A Carnot cycle is operated in reverse as a refrigerator taking in 36. J every minute and "dumping" 40. J per minute at a room temperature of 23.°C. The net entropy increase per minute is
A) 0.13 J/°K B) 36.J/°K C) 0.15 J/°K D) zero E) 0.15 kJ/°K
Find the magnetic energy stored in the air gap between two very large magnetic pole pieces, one North, one South, each with an area of 100 cm2 . Assume the 0.05-T magnetic field is uniform within the 2-cm gap