Series/Parallel Circuits: A 22-A current flows into a parallel combination of 4.0-?, 6.0-?, and 12-? resistors. What current flows through the 12-? resistor?
A. 18 A
B. 11 A
C. 7.3 A
D. 3.7 A
Answer: D
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Uranium serves as the source of the Sun's energy because
a. uranium atoms can be fissioned into lighter atoms and energy. b. uranium atoms can be fused into helium and energy. c. uranium atoms can be fused into hydrogen and energy. d. none of the above because fusion of hydrogen atoms serves as the Sun's source of energy. e. none of the above because fusion of helium atoms serves as the Sun's source of energy.
A 55-cm brass rod has a diameter of 30 cm. The compressive strength of steel is 250 × 106 N/m2. What is the compression force that would break the rod?
A) 1.8 × 107 N B) 2.4 × 107 N C) 1.4 × 108 N D) 2.4 × 108 N E) 4.5 × 108 N
The zirconium nucleus contains 40 protons, and an electron is 1.0 nm from the nucleus. What is the electric force on the electron due to the nucleus? ( e = 1.60 × 10-19 C, k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A) 2.9 nN B) 1000 C C) 3.7 nN D) 6.8 nN E) 9.2 nN
When you blow some air above the upper face of a paper strip, the paper rises. This occurs because
A) the air above the upper face of the paper moves faster, which makes the pressure lower than at the lower face. B) the air above the upper face of the paper moves faster, which makes the pressure higher than at the lower face. C) the air above the upper face of the paper moves slower, which makes the pressure lower than at the lower face. D) the air above the upper face of the paper moves faster but the pressure remains constant. E) the air above the upper face of the paper moves slower, which makes the pressure higher than at the lower face.