Why are some isotopes used as tracers?

1 answer:

6 0

C. They decay at a predictable rate. IE carbon 14 decay to carbon 12 to understand how long ago something was alive.

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Janet recently read an article about the role that the brain plays in processing emotions. Janet comes over to your house for di

Ira Lisetskai [31]

Amygdala helps in processing emotions
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3 0

3 years ago

A coin is dropped from a height and reaches the ground in 2 seconds. Neglecting air resistance, from what height (in meters) was

Kamila [148]

Answer:

Coin is dropped from a height of 19.62 m

Explanation:

We have given time t = 2 sec

As coin is drop means its initial velocity u = 0 m/sec

We have to find the height from which coin is dropped

From second equation of motion we know that

$h=ut+\frac{1}{2}gt^2$

So height $h=0\times2+\frac{1}{2}\times 9.81\times 2^2=19.62m$

So coin is dropped from a height of 19.62 m

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3 years ago

When the northern hemisphere is tilted toward the sun that part of the earth is closer to the sun and thus hotter? True or false

Ratling [72]

False

Explanation:

Most of us have a belief that Earth is very close to the sun in summer season and so it is hotter. Also, since Earth is far away from the sun in winter season, it is colder. Though this idea looks true, it is incorrect.

The orbit of the Earth isn't a perfect circle. It is quite tilted. During some months of the year, Earth is very close to the sun than at other times. We have winter when the Earth is very close to the sun and summer when it is far away in the Northern Hemisphere. So when we compare the distance of the Sun from the Earth, this change in Earth's distance throughout the year does not affect our weather much.

8 0

3 years ago

A cannon shoots an artillery shell with a initial velocity of 400 meters/second at an indirect fire angle of 60 on level ground

notsponge [240]

Answer: 14139.19 m

Explanation:

This situation is related to parabolic motion and can be solved using the following equations:

$x=V_{o}cos \theta t$ (1)