For an object in static equilibrium
A. The net torque about any point is zero
B. None of these are true.
C. The net torque about every point is different
D. The net torque about every point is a nonzero constant
Ans: A. The net torque about any point is zero
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Resistance and Resistivity: A 1.0-mm diameter extension cord is made of metal having a resistivity of 1.68 × 10-8 ? ? m. When it carries a current of 15 A, what is the potential difference between two points in the cord that are 100 m apart?
A. 12 V B. 23 V C. 32 V D. 41 V
An uncharged conductor has a hollow cavity inside of it. Within this cavity there is a charge of +10 µC that does not touch the conductor. There are no other charges in the vicinity. Which statement about this conductor is true?
(There may be more than one correct choice.) A) The inner surface of the conductor carries a charge of -10 µC and its outer surface carries no excess charge. B) The inner and outer surfaces of the conductor each contain charges of -5 µC. C) The net electric field within the material of the conductor points away from the +10 µC charge. D) The outer surface of the conductor contains +10 µC of charge and the inner surface contains -10 µC. E) Both surfaces of the conductor carry no excess charge because the conductor is uncharged.
Infall of ________ may explain the higher than expected star formation rates in galaxies
Fill in the blank(s) with correct word
Which of the following is not considered crucial for life to exist on some world?
A) a liquid, such as liquid water B) a source of energy that can be used by life C) a source of nutrients D) an atmosphere