What is the total energy stored in the group of capacitors shown if the charge on the 30-?F capacitor is 0.90 mC?
a.
29 mJ
b.
61 mJ
c.
21 mJ
d.
66 mJ
e.
32 mJ
d
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If a beam of electromagnetic radiation has an intensity of 120 W/m2, what is the maximum value of the electric field? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A) 1.5 kV/m B) 1.0 µT C) 1.0 µV/m D) 0.30 kV/m E) 0.0032 V/m
The horizontal acceleration of a projectile
a. is zero. b. stays constant. c. continuously increases. d. continuously decreases. e. sometimes decreases and sometimes increases.
A car needs to generate 75.0 hp in order to maintain a constant velocity of 27.3 m/s on a flat road. What is the magnitude of the total resistive force acting on the car (due to friction, air resistance, etc.)? (1 hp = 746 W)
A) 2.05 × 103 N B) 2.75 N C) 1.03 × 103 N D) 2.87 × 103 N
At what rate is thermal energy generated in the 30-? resistor?
a.
20 W
b.
27 W
c.
60 W
d.
13 W
e.
30 W