If the planet Jupiter underwent gravitational collapse, its rate of rotation about its axis would
A) decrease.
B) increase.
C) stay the same.
D) need more information
Answer: B
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A 120-V rms signal at 60.0 Hz is applied across a series combination of a 30.0-mH inductor and a resistor. If the rms value of the current in this circuit is 0.600 A, what is the resistance of the resistor?
A) 200 ? B) 143 ? C) 80.0 ? D) 30.0 ? E) 268 ?
If the magnitude difference between one star and another is 8, the stars differ in brightness by a factor of
a. 2.51. b. 20. c. 7. d. 1580.
A 60.0-kg person drops from rest a distance of 1.20 m to a platform of negligible mass supported by an ideal stiff spring of negligible mass. The platform drops 6.00 cm before the person comes to rest
What is the spring constant of the spring? A) 2.56 × 105 N/m B) 3.92 × 105 N/m C) 5.45 × 104 N/m D) 4.12 × 105 N/m E) 8.83 × 104 N/m
Newton hypothesized that the forces acting on planets was
A) along their directions of travel. B) perpendicular to their directions of travel. C) toward the Sun. D) none of the above