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maks197457 [2]
3 years ago
7

As a new mechanical engineer for Engines Inc., you have been assigned to design brass pistons to slide inside steel cylinders. T

he engines in which these pistons will be used will operate between 20.0 ∘C and 150.0 ∘C. Assume that the coefficients of expansion are constant over this temperature range.
Chemistry
1 answer:
Evgen [1.6K]3 years ago
3 0

Answer:

0150.0

Explanation:

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kiruha [24]

A standard drink of beer is 12 ounces


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Number 2 I don't get what the question is asking
Rus_ich [418]
Wow thats pretty hard its asking how many is in each of those
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A fossil was analyzed and determined to have a carbon-14 level that is 70 % that of living organisms. The half-life of C-14 is 5
Citrus2011 [14]

Answer: 2948

Explanation:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

t_{\frac{1}{2}}=\frac{0.693}{k}

k=\frac{0.69}{t_{\frac{1}{2}}}=\frac{0.693}{5730}=1.21\times 10^{-4}years^{-1}

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant  = 1.21\times 10^{-4}years^{-1}

t = age of sample  = ?

a = let initial amount of the reactant  = 100

a - x = amount left after decay process = \frac{70}{100}\times 100=70

t=\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{70}

t=2948years

Thus the fossil is 2948 years old.

5 0
3 years ago
1. Plants that perform photosynthesis convert sun (solar) energy to<br> food energy.
Alinara [238K]

Answer:

true

Explanation:

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3 0
3 years ago
Please help asappp‍♀️!
solniwko [45]
Can you show me the passage?
6 0
3 years ago
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