Answer:
The forces experienced by the middle particle are attractive, and the net force will remain the same (0) if and only if the distances of the sides particles to the middle particle are the same.
Explanation:
In example 20.3 the forces experienced by the middle particle are repulsive because all the particles are positive, for the case in which the particles on the sides are replaced for negative charge particles the forces experienced by the middle particle are attractive. Regarding the net force, because we don't know the distances we can not give a definitive answer, what we can say is that if the distances from the middle particle to the sides particles are the same the net force is zero for both cases (remain unchanged).
I racked my brain for almost 10 minutes, until suddenly,
it hit me !
You're breathing one right now ! So am I .
Air is a mixture of a lot of elements.
Nitrogen, Oxygen, and Argon account for 99.964 percent.
The other 0.036 percent is mainly Neon, Helium, Krypton,
and Hydrogen ... more elements.
Then there are Carbon Dioxide and water vapor.
Yes, those are compounds. But together, they add up
to very little of the air we breathe, and if both of them
suddenly disappeared, we would hardly notice it.
Acceleration due to gravity is different in every location, because gravity itself is different in every location.
Here are a few values of gravitational acceleration in various places:
-- Surface of Jupiter . . . 24.8 m/s²
-- Surface of Mars . . . 3.7 m/s²
-- Surface of the Sun . . . 274 m/s²
-- Surface of Earth . . . 9.8 m/s²
-- In orbit 300 miles above the Earth's surface . . . 8.5 m/s²
-- Surface of Earth's Moon . . . 1.6 m/s²
<span>Geologists cannot yet predict earthquakes because the earthquakes caused by the movement of plates do not have the precise time and place when will it moves.</span>
