What is the rms voltage of the “square-wave” potential shown in Figure OQ33.4?
1.?2·?Vmax
2.?Vmax
3.?Vmax/?2
4.?Vmax/2
5.?Vmax/4
3
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The ____________ force is involved in the radioactive decay of certain kinds of nuclear particles
Fill in the blank(s) with correct word
Calorimetry: A camper is about to drink his morning coffee. He pours 400 grams of coffee, initially at 75°C into a 250-g aluminum cup, initially at 16°C. What is the equilibrium temperature of the coffee-cup system, assuming no heat is lost to the surroundings? The specific heat of aluminum is 900 J/kg ? K, and the specific heat of coffee is essentially the same as that of water, which is 4186 J/kg ? K.
A. 45°C B. 62°C C. 65°C D. 68°C E. 71°C
In many cartoon shows, a character runs of a cliff, realizes his predicament and lets out a scream. He continues to scream as he falls
If the physical situation is portrayed correctly, from the vantage point of an observer at the top of the cliff leaning over the edge, the pitch of the scream should be A) higher than the original pitch and constant. B) higher than the original pitch and increasing as he falls. C) lower than the original pitch and constant. D) lower than the original pitch and decreasing as he falls. E) It is impossible to predict.
Which of these lamps has no mercury content?
A) fluorescent lamp B) CFL C) incandescent lamp D) none of the above