Four identical 1.5-mF capacitors are connected together electrically. What is the least possible capacitance of the combination?
a. 3.0E–4 F
b. 2.5E–4 F
c. 3.8E–4 F
d. 1.5E–3 F
e. 6.7E–4 F
c
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In the diagram, each resistor is 3 ohms and the battery is 9 volts. What is the current through the middle resistor?
A. 3 A to the right
B. 3 A to the left
C. 9 A to the right
D. 9 A to the left
E. 1 A to the left
In state n = 1, the energy of the hydrogen atom is -13.58 eV. What is its energy in state n = 2?
A) -13.58 eV B) -6.79 eV C) -4.53 eV D) -3.40 eV E) -1.51 eV
A rocket with a mass of 2.0 × 106 kg is designed to take off from the surface of the earth by burning fuel and ejecting it with an exhaust speed of 3500 m/s
What is the minimum rate at which the fuel should be consumed in order to attain liftoff? A) 5.6 × 103 kg/s B) 1.4 × 103 kg/s C) 1.8 × 103 kg/s D) 2.8 × 103 kg/s E) 18 × 103 kg/s
The main form of radiation that our bodies emit is
a. ultraviolet. b. infrared. c. x-ray. d. microwave. e. blackbody.