The air we breathe is mostly oxygen
Indicate whether the statement is true or false
F
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Determine the energy stored in the 40-?F capacitor.
A. 2.4 mJ B. 1.6 mJ C. 2.0 mJ D. 2.9 mJ E. 4.0 mJ
In an AC series circuit, the current in a pure resistor differs in phase with the applied voltage by what angle?
a. zero b. 45° c. 90° d. 180°
A machinist turns on the power on to a grinding wheel at time t = 0 s. The wheel accelerates uniformly from rest for 10 s and reaches the operating angular speed of The wheel is run at that angular velocity for 30 s, and then power is shut off
The wheel slows down uniformly at until the wheel stops. What is the total number of revolutions made by the wheel in this situation? A) 510 B) 280 C) 320 D) 470 E) 750
In a thundercloud there may be an electric charge of +40 C near the top of the cloud and -40 C near the bottom of the cloud. These charges are separated by about 2.0 km. What is the electric force between these two sets of charges? (ke = 8.99 × 10^9 N•m2/C2)
a. 3.6 × 10^6 N c. 3.6 × 10^7 N b. 3.6 × 10^4 N d. 3.6 × 10^5 N