The energy released from a nuclear reaction is equal to:
a. energy associated with momentum conservation.
b. the exothermic endothermy.
c. energy associated with the change in mass.
d. the total charge involved.
C
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Building codes usually limit the current carried by a No. 14 copper wire to 15 A. Many household circuits are wired with this size wire. What is the drift velocity of the electrons in this case?
The diameter of this wire is 1.6 mm. Assume one conduction electron per atom in copper. The atomic weight of copper is 63.3 g/mol and its density is 8900 kg/m3. Avogadro's number is 6.022 × 1023 molecules/mol and e = 1.60 × 10-19 C. A) 5.51 × 10-4 m/s B) 4.56 × 10-4 m/s C) 1.65 × 10-3 m/s D) 4.44 × 10-2 m/s E) 4.89 × 10-5 m/s
Because of absorption, a Polaroid will actually transmit 40% of incident unpolarized light. Two such Polaroids with their axes aligned will transmit
A) 0%. B) 40%. C) 100%. D) between 0% and 40%. E) between 40% and 100%.
A 2.0 kg softball is pitched to you at 20. m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.10 s, the average force the bat exerted was
A) 0.40 kN. B) 40. N. C) zero. D) 0.80 kN. E) 0.65 kN.
What must be the diameter of a cylindrical 120-m long metal wire if its resistance is to be 6.0 ?? The resistivity of this metal is 1.68 × 10-8 ? ? m
A) 0.65 cm B) 0.65 mm C) 0.0325 mm D) 0.065 mm E) 0.325 mm