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3 years ago

14

What is the evidence that an asteroid collision has happened before?

1 answer:

AleksandrR [38]3 years ago

6 0

Answer:

The first clue that an asteroid had struck earth at around the same time as the mass extinction was the amount of iridium around the K-T boundary. Another clue was that they found that most animals that lived in the cretaceous died when the asteroid crashed and they found bones of animals from the cretaceous.

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Two massless bags contain identical bricks, each brick having a mass M. Initially, each bag contains four bricks, and the bags m

stepladder [879]

Answer: $F_{2}=\frac{3}{4}F_{1}$

Explanation:

According to Newton's law of universal gravitation:

$F=G\frac{m_{1}m_{2}}{r^2}$

Where:

$F$ is the module of the force exerted between both bodies

$G$ is the universal gravitation constant.

$m_{1}$ and $m_{2}$ are the masses of both bodies.

$r$ is the distance between both bodies

In this case we have two situations:

1) Two bags with masses $4M$ and $4M$ mutually exerting a gravitational attraction $F_{1}$ on each other:

$F_{1}=G\frac{(4M)(4M)}{r^2}$ (1)

$F_{1}=G\frac{16M^2}{r^2}$ (2)

$F_{1}=16\frac{GM^2}{r^2}$ (3)

2) Two bags with masses $2M$ and $6M$ mutually exerting a gravitational attraction $F_{2}$ on each other (assuming the distance between both bags is the same as situation 1):

$F_{2}=G\frac{(2M)(6M)}{r^2}$ (4)

$F_{2}=G\frac{12M^2}{r^2}$ (5)

$F_{2}=12\frac{GM^2}{r^2}$ (6)

Now, if we isolate $\frac{GM^2}{r^2}$ from (3):

$\frac{F_{1}}{16}=\frac{GM^2}{r^2}$ (7)

Substituting $\frac{GM^2}{r^2}$ found in (7) in (6):

$F_{2}=12(\frac{F_{1}}{16})$ (8)

$F_{2}=\frac{12}{16}F_{1}$ (9)

Simplifying, we finally get the expression for $F_{2}$ in terms of $F_{1}$ :

$F_{2}=\frac{3}{4}F_{1}$

5 0

4 years ago

Which are the main regions of the periodic table? A. metals, nonmetals, gases B. solids, liquids, gases C. metals, semimetals, n

nlexa [21]

Answer:

the answer is C.

Explanation:

8 0

4 years ago

Which is more dangerous to living things: gamma rays or X-rays?

Dima020 [189]

Answer:

gamma

Explanation:

x rays are often used in hospitals

gamma rays :

are highly penetrating

have highly energetic ionizing radiation

frequency is higher

wavelengths are shorter rays

can attack DNA and break the strands of that essential biological molecule

quizlet

brainly.com/question/13047731

quora

6 0

2 years ago

Read 2 more answers

Carlos conduce su automóvil a 70 Km/h, mientras que Luis maneja una camioneta a la misma velocidad

DIA [1.3K]

Answer:

shsissjsisjuai

Explanation:

abajxyxaiaodkxfk

4 0

3 years ago

True or false? Electrons can move, but positive charges can't.True or false? Electrons can move, but positive charges can't.

shepuryov [24]

Answer:

true

Explanatio

7 0

3 years ago