Identify the FALSE statement. You could summarize our Solar System's development by saying:
it formed solely from atoms generated by the big bang.
its formation began as gravity pulled material into a bulbous disc.
the central ball of the bulbous disc developed into the Sun.
outlying material of the disc condensed into planetesimals.
planetesimals coalesced to form the planets.
it formed solely from atoms generated by the big bang.
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Resistance and Resistivity: You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the smallest possible resistance, you should attach the leads to the opposite faces that measure
A. 3 cm × 5 cm. B. 3 cm × 8 cm. C. 5 cm × 8 cm. D. Any pair of faces produces the same resistance.
An 800-N woman stands at rest on two bathroom scales so that one scale shows a reading of 500 N. The reading on the other scale is
A) 200 N. B) 300 N. C) 400 N. D) 800 N. E) none of the above
Suppose you have two point charges of opposite sign. As you move them farther and farther apart, the potential energy of this system relative to infinity
A) increases. B) decreases. C) stays the same.
A 5.0-kg mass is attached to the ceiling of an elevator by a rope whose mass is negligible. What force does the mass exert on the rope when the elevator has an acceleration of 4.0 m/s2 upward?
a. 69 N downward b. 29 N downward c. 49 N downward d. 20 N downward e. 19 N downward