Answer:
b. flat rotation curves in spiral galaxies
Explanation:
Dark matter accounts for majority of the matter in the universe (about 85%). It is considered to be composed of subatomic particles which are yet to be discovered. Dark matter cannot be observed because it does not emit light that can be detected. Only its gravitational effect is visible.
Astronomers when calculated the mass of the visible matter and tried to account for the observed speed of stars in the galaxy, there was a mismatch. To understand what caused this mismatch, astronomers gave name to the invisible matter as the Dark Matter.
The expected velocity of stars should decrease away from the near the center of the galaxy but a constant velocity of stars was observed that is a relatively flat rotation curve was obtained.
Thus, flat rotation curves in spiral galaxies in an evidence of Dark Matter.
The correct answer is - the labor force is cheaper.
The living standard in Mexico is much lower than the one in the United States. In accordance to it, the wages are much lower as well, so the labor force is very cheap when compared with the labor force of the United States.
In order to increase their profit, lots of companies have moved and made facilities in Mexico, so for the same work, they are paying the workers much less, and all owners would prefer that the same job is done for lesser amount of money.
You are reducing the amount of pollution that goes into the water. It also reduces the amount of trash that could be consumed by animals. Hope this helped <span />
It has included them in the news of the US and the rest of the world.
Answer:
Mariana trench is the deepest trench in the world. Now there is a difference of gravitational force between that of the earth surface and the trench. The reason is that the trench depth is about 10.9 Km and the radius measured from the surface to the center of the Earth is about 6,371 km.
So the trench is more deeper then the surface of earth and the pull of gravity will be different due to that reason inside that region.
Explanation:
Now, we can just subtract the depth of the trench from the radius "r" given, we get:
6,371×10³-10.9×10³ m = 6360.1 km,
Now simplifying the numbers (gravitational constant times mass of earth divided by that radius (6360100 m) squared.
We will get 9.8473 m/s².
The value of gravitational force will be 9.8473 m/s² inside Mariana trench
- <em>We are provided by the Newton's Gravitational</em>
