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3 years ago

All moving parts produce friction. true or false

Chemistry

2 answers:

PSYCHO15rus [73]3 years ago

8 0

The answer would most likely be true

PilotLPTM [1.2K]3 years ago

5 0

Hey there! :D

To some extent, all moving parts produce friction. It can be very small or minimal, but all parts produce some form of friction.

This is true.

I hope this helps!
~kaikers

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2 years ago

A sample contains 25% parent isotope and 75% daughter isotopes. If the half-life of the parent isotope is 72 years, how old is t

alisha [4.7K]

The radioactive decay obeys first order kinetics

the rate law expression for radioactive decay is

$ln\frac{[A_{0}]}{[A_{t}]}=kt$

Where

A0 = initial concentration

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t = time

k = rate constant

For first order reaction the relation between rate constant and half life is:

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

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Given

At = 0.25 A0

$ln(\frac{A0}{0.25A0})=0.009625 X time$

time = 144 years

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2 years ago

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Aneli [31]

Answer:

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