Describe the main properties that scientists measure when they study populations

1 answer:

8 0

<span>Size, density, and growth rate are the three main ones. There is also dispersion, age structure, and survivorship. </span>

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Carbon-14 has a half-life of 5730 years. A sample of wood has been recovered by an archaeologist. The sample is sent to a labora

givi [52]

Answer: 4282.928 = 4283 years

Explanation:

Data given;

Carbon 14 half life = 5740

No (initial radiation) = 0.230 Bq/g

Nf (final radiation) = 0.137 Bq/g

First we find the decimal fraction of the remaining half life of the carbon 14

k = No / Nf

k = (0.137 / 0.230) = 0.595652

So to find how many half-life has elapsed, we say

(1/2)^n = k

(1/2) ^n = 0.595652

Therefore

n log 0.5 = log 0.595652

n = ( log 0.595652) / ( log 0.5)

n = 0.747457

To get the elapsed time or how old the sample is;

We say

Carbon 14 half-life × n

5730 yrs × 0.747457

= 4282.928

= 4283 years.

So the sample of the wood is 4283 years old.

4 0

2 years ago

We also know that the astronaut’s weight on Earth is 156.6 pounds. Which equation models the situation? no links pls they didn't

Klio2033 [76]

Given what we know, we can confirm that the equation to model the situation can be created by multiplying the mass of the astronaut by the force of gravity on earth.

<h3>What is Mass and the force of gravity?</h3>

Mass is the amount of matter in an object or body.
What we refer to as weight, is really the force being applied by an object together with the force of gravity.
Gravity is an invisible force applied by the earth on all objects.
Together will mass, these forces create what we know as weight.

Therefore, we can confirm that the equation to model the situation can be created by multiplying the mass of the astronaut by the force of gravity on earth, which would be 7.2 kg of mass multiplied by 9.807 m/s² which will result in a "weight" of 156.6 pounds or 71 kg.