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kirill [66]
3 years ago
14

Which example shows an endothermic reaction?

Physics
1 answer:
Nata [24]3 years ago
6 0

Answer:

reactants --> products + thermal energy

Explanation:

Heat is absorbed in endothermic reaction.

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matrenka [14]

Answer:

calculate the cars acceleration usingv=u+at

Explanation:

m/s. After 5 s the car reaches the bottome of the hill. Its speed at the bottom of the ... accelerating left a rownie. 10. A cart slows down while moving away from the ... does it need to accelerate to a velocity of 20 m/s

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3 years ago
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Determine the amount of time for polonium-210 to decay to one fourth its original quantity. The half-life of polonium-210 is 138
ira [324]

Answer: 276 days

Explanation:

This problem can be solved using the Radioactive Half Life Formula:  

A=A_{o}.2^{\frac{-t}{h}} (1)  

Where:  

A=\frac{1}{4}A_{o} is the final amount of the material

A_{o} is the initial amount of the material  

t is the time elapsed  

h=138 days is the half life of polonium-210

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

\frac{1}{4}A_{o}=A_{o}2^{\frac{-t}{138 days}} (2)  

\frac{A_{o}}{4A_{o}}=2^{\frac{-t}{138 days}} (3)  

\frac{1}{4}=2^{\frac{-t}{138 days}} (4)  

Applying natural logarithm in both sides:

ln(\frac{1}{4})=ln(2^{\frac{-t}{138 days}}) (5)  

-1.386=-\frac{t}{138days}ln(2) (6)  

Clearing t:

t=276days (7)  

7 0
3 years ago
What does the term "catastrophic event" mean to you
ozzi

Answer:

an event which took place which had such a significant impact.

Explanation:

6 0
3 years ago
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A ray of light of frequency 5.09 x 10^14hertz is incident on a water-air interface as shown in the diagram below.
Otrada [13]
A is the only answer because

the day of light and the rat of death starved with pyramids, so this We will all die
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How is Oil bad for the environment?
stepladder [879]
Oil spill on land and in the oceans and kills wildlife like the great barear reef
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