Gravitational Potential Energy: Three masses are located as follows: a 3.0-kg mass is at the origin, a 4.5-kg mass at (0.0 m, 4.0 m) and a 2.5-kg mass at (3.0 m, 0.0 m). What is the gravitational potential energy of this system of masses? (G = 6.67 × 10-11 N ? m2/kg2)
A. -3.8 × 10-10 J
B. -3.9 × 10-10 J
C. -5.4 × 10-10 J
D. -3.2 × 10-10 J
E. -3.5 × 10-10 J
Answer: C
You might also like to view...
Lenz's Law: The wire in the figure carries a current I that is decreasing with time at a constant rate. The wire and the three loops are all in the same plane. What is true about the currents induced in each of the three loops shown?
A. No current is induced in any loop. B. The currents are counterclockwise in all three loops. C. The currents are clockwise in all three loops. D. Loop A has clockwise current, loop B has no induced current, and loop C has counterclockwise current. E. Loop A has counterclockwise current, loop B has no induced current, and loop C has clockwise current.
A 25.0-mH inductor, a 2.00-?F capacitor, and a certain resistor are connected in series across an ac voltage source at 1000 Hz. If the impedance of this circuit is 200 ?, what is the resistance of the resistor?
A) 100 ? B) 184 ? C) 200 ? D) 552 ? E) 579 ?
Charon's orbit:
A) lies exactly in Pluto's orbital plane. B) is highly inclined to Pluto's orbital plane. C) is perpendicular to Pluto's equator. D) is retrograde. E) has not been determined yet.
The choices below each describe the appearance of an H-R diagram for a different star cluster. Which cluster is most likely to be located in the halo of our galaxy?
A) The diagram shows main-sequence stars of spectral types G, K, and M, along with numerous giants and white dwarfs. B) The diagram shows main-sequence stars of all the spectral types except O and B, along with a few giants and supergiants. C) The diagram shows main-sequence stars of every spectral type except O, along with a few giants and supergiants. D) The diagram shows no main-sequence stars at all, but it has numerous supergiants and white dwarfs.