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salantis [7]
2 years ago
10

Two common gem varieties of the mineral corundum are ___ and ___.

Physics
1 answer:
Stella [2.4K]2 years ago
6 0
The answer is B. ruby; sapphire
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Describe two reasons why scientists are looking for alternatives to fossil fuels
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1) It is because they produce a lot of pollution in the atmosphere
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3 0
3 years ago
How much heat is absorbed by a 450g gold block as energy from the sun causes its temperature to change from 27°C to 32°C? (Speci
kotegsom [21]

Answer:

Q = 1057.5 [cal]

Explanation:

In order to solve this problem, we must use the following equation of thermal energy.

Q=m*C_{p}*(T_{final}-T_{initial})

where:

Q = heat energy [cal]

Cp = specific heat = 0.47 [cal/g*°C]

T_final = final temperature = 32 [°C]

T_initial = initial temperature = 27 [°C]

m = mass of the substance = 450 [g]

Now replacing:

Q=450*0.47*(32-27)\\Q=1057.5[cal]

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3 years ago
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55mph

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3 years ago
How is Einstein's equation E = mc^2 used in medicine?
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This equation is used in nuclear medicine. Nuclear medicine is the branch of medicine that deals with the use of radioactive substances in research, diagnosis, and treatment.
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In physics, this equation is generally used in the nuclear physics. </span><span>E = mc^2 gives the energy release during a nuclear reaction.</span><span>

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