When a ball falls downward, it may have a net force
A) equal to its weight.
B) of zero.
C) equal to its weight minus air drag.
D) any of the above
E) none of the above
Answer: D
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A copper cable needs to carry a current of 160 A with a power loss of only 2.0 W/m. What is the required radius of the copper cable? (The resistivity of copper is 1.7 × 10^?8 ??m)
a. 0.43 cm b. 0.83 cm c. 1.7 cm d. 2.6 cm e. 0.33 cm
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The principle of continuity states that for fluid flow to be continuous it must
A) speed up in narrow regions of flow. B) slow down in wide regions of flow. C) both of these D) neither of these