The "giant impact hypothesis" refers to the idea that
a. our Moon formed when a Mars-size object collided with the young Earth.
b. the planets formed when another star nearly collided with our Sun.
c. dinosaur extinction was caused by the impact of an asteroid.
d. large craters on the Moon were formed by large impacts.
Answer: a. our Moon formed when a Mars-size object collided with the young Earth.
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The large gaps in the asteroid belt (often called Kirkwood gaps) are caused by
A) large asteroids that clear certain regions of the asteroid belt. B) tidal forces from Jupiter. C) tidal forces from the Sun. D) orbital resonances with Jupiter. E) the competing gravitational tugs of Mars and Jupiter.
An astronaut has landed on another planet and conducts an experiment to determine the acceleration of gravity on that planet. She uses a pendulum 0.640 m long and determines that the period of oscillation is 2.60 s
What is the acceleration of gravity on that planet? A) 4.85 m/s2 B) 1.66 m/s2 C) 3.74 m/s2 D) 2.39 m/s2 E) 9.81 m/s2
The magnetic field lines generated by a bar magnet
A) are external only. B) are both external and internal to the magnet. C) follow an inverse-square law. D) none of the above
Three point charges are placed on the x-axis, as follows. A charge of +2.0 ?C is at the origin, a charge of -2.0 ?C is at x = 50 cm,
and a charge of +4.0 ?C is at x = 100 cm. What are the magnitude and direction of the electrostatic force on the charge at the origin due to the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )