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almond37 [142]
3 years ago
11

When a pendulum swings if not continuously pushed it will stop eventually because some of its energy is changef into what energy

Physics
2 answers:
balandron [24]3 years ago
8 0
Thermal Energy will be your answer

Musya8 [376]3 years ago
3 0
When a pendulum swings if not continuously pushed it will stop eventually because some of its energy is changed into thermal energy.
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An unknown radioactive element decays with a half life of 0.210 days. What is the decay constant, expressed in 1/microseconds, f
sergeinik [125]

The amount of a radioactive element over time can be written as:

N=N_0e^{-\lambda t}

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3 0
2 years ago
I have an object that I want to know when it was made. I calculate that the object contains 0.12g of Iodine-131 but started with
Sav [38]

Answer: 71.72 days

Explanation:

This problem can be solved using the <u>Radioactive Half Life Formula: </u>

A=A_{o}.2^{\frac{-t}{h}} (1)  

Where:  

A=0.12 g is the final amount of Iodine-131

A_{o}=60 g is the initial amount of Iodine-131

t is the time elapsed  

h=8 days is the half life of Iodine-131

Knowing this, let's substitute the values and find t from (1):

0.12 g=(60 g)2^{\frac{-t}{8 days}} (2)  

\frac{0.12 g}{60g}=2^{\frac{-t}{8 days}} (3)  

Applying natural logarithm in both sides:

ln(\frac{0.12 g}{60g})=ln(2^{\frac{-t}{8 days}}) (4)  

-6.21=-\frac{t}{8 days}ln(2) (5)

Finding t:

t=71.72 days

7 0
4 years ago
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