Converting compound units
1 answer:
Answer:
Dividing the silicon density by 1000 and then multiply it by 1000000.
Explanation:
A kilogram equals 1000 grams and a cubic meter equals 1000000 cubic centimeters. Hence, we must divide the silicon density by 1000 and then multiply itby 1000000 to convert the value into kilograms per cubic centimeter. That is:
In a nutshell, we must multiply the density of silicon by 1000 to obtains its value in kilograms per cubic meter.
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A) 1 cal
B) 80 cal
C) 540 cal
Explanation:
A)
The amount of heat energy needed to raise the temperature of a certain mass of a substance is given by
where
m is the mass of the substance
C is the specific heat capacity
is the change in temperature
In this problem:
m = 1 g is the mass of water
is the specific heat capacity of water
is the change in temperature
So, the heat needed is
B)
For a solid substance at its melting point, the amount of heat needed to melt completely the substance is given by
where
m is the mass of the substance
is the specific latent heat of fusion of the substance
In this problem:
- The ice is already at melting point, 0 °C
- Mass of the ice:
- Specific latent heat of fusion of ice:
So, the heat needed is
C)
For a liquid substance at its boiling point, the amount of heat needed to boil completely the substance is given by
where
m is the mass of the substance
is the specific latent heat of vaporization of the substance
In this problem:
- The water is already at boiling point, 100 °C
- Mass of the water:
- Specific latent heat of vaporization of water:
So, the heat needed is