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snow_tiger [21]
2 years ago
8

You will need the following materials to build the model:

Biology
1 answer:
vitfil [10]2 years ago
3 0

Answer:

the train leaves at the end and the family.

Explanation:

get up and running with the base.

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Strontium-90 has a half life of 29 years, how much strontium-90 is left from the Chicago pile reactor that was active around 87
agasfer [191]

Answer:

The answer is below

Explanation:

The half life of a substance is the time required by that substance to reduce to half of its initial value. The half life is calculated using the formula:

N(t)=N_o(\frac{1}{2} )^\frac{t}{t_\frac{1}{2} } \\\\where\ N(t)=quantity\ of\ substance \ remaining, N_o=initial\ quantity\\of\ substance, t=time\ and \ t_\frac{1}{2}=half\ life\ of\ substance

Given that t = 87 years, half life = 29 years, therefore the quantity of strontium-90 left is:

N(t)=N_o(\frac{1}{2} )^\frac{87}{29} \\\\N(t)=N_o(\frac{1}{2} )^\frac{t}{t_\frac{1}{2} } \\\\N(t)=N_o(\frac{1}{2} )^3\\\\N(t)=\frac{1}{8} N_o

That is one-eight of Strontium 90 would be left after 87 years

6 0
2 years ago
Steroids are a major class of____.
Gennadij [26K]

Answer:

D

Explanation:

Additional classes of steroids include:  

Neurosteroids such as DHEA and allopregnanolone

Aminosteroid neuromuscular blocking agents such as pancuronium bromide

6 0
3 years ago
Which system sends messages about the senses to the brain
vagabundo [1.1K]

Answer:

The Nervous System

The basic workings of the nervous system depend a lot on tiny cells called neurons. The brain has billions of them, and they have many specialized jobs. For example, sensory neurons send information from the eyes, ears, nose, tongue, and skin to the brain.

Explanation:

Hope It Help

3 0
3 years ago
A living thing that makes its own food ( in a food chain )
tester [92]
The only living thing that makes its own food is the plant. So the first step in a food chain is always a plant that makes its own food by sun. :)))
I hope this is helpful
have a nice day
6 0
3 years ago
Which of the following are possible conditions during an El Nino event?
____ [38]
B is the correct answer
3 0
3 years ago
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