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taurus [48]
3 years ago
12

Match the half life and time information to the percentage of radioactive isotope left.

Physics
1 answer:
Kazeer [188]3 years ago
8 0

Answer:

Explanation:

can i have brainliest pls im new

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Two airplanes leave an airport at the same time. The velocity of the first airplane is 730 m/h at a heading of 44.3 ◦ . The velo
Goshia [24]

Answer:

So airplane will be 1324.9453 m apart after 2.9 hour

Explanation:

So if we draw the vectors of a 2d graph we see that the difference in angles is  = 83 - 44.3 = 83-44.3=38.7^{\circ}

Distance traveled by first plane = 730×2.9 = 2117 m

And distance traveled by second plane = 590×2.9 = 1711 m

We represent these distances as two sides of the triangle, and the distance between the planes as the side opposing the angle 38.7.

Using the law of cosine, d^2 representing the distance between the planes, we see that:

d^2=2117^2 + 1711^2 -2\times (2117)\times (1711)cos(38.7)=1755480.2482

d = 1324.9453 m

4 0
3 years ago
Which of the following best describes what muscles do.
kow [346]

I think b support body weight

8 0
3 years ago
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Earth's Moon is considered to be geologically dead because its interior has cooled considerably. Select the features of Earth th
DochEvi [55]

Answer:

The correct option is;

E. motion of tectonic plates.

Explanation:

The Moon is formed from the Earth, and so have similar composition. However, the smaller size of the moon as well as the low temperature of the Moon's mantle compared to the interior of the earth, contribute the state of the Moon having no active tectonic plate motion and no convection.

The convection in the mantle, drives Earth's tectonic plate motions. The mantle within Earth moves at a rate of some centimeters annually, while the Moon, geologically is a dying world.  

4 0
3 years ago
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How much does a 20 kg rock weigh on Earth where g = 9.8 m/s2?
pentagon [3]

Answer:

\huge\boxed{196\:N}

Explanation:

Mass and weight ain't the same thing. So, for calculating weight we would use Newton's 2nd Law of Motion i.e. Force = Mass × Acceleration.

According to question,

The mass is 20kg

Acceleration is 9.8 m/s^2

Putting the given values into the formula,

F = 20 × 9.8

F = 196N

So, the weight of the rock is 196 N

Hope it helps!<3

3 0
3 years ago
And metamorphic rock is classified according to its
ICE Princess25 [194]
The answer is basis of texture
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3 years ago
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