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Sagot :
To determine the numerical value of 1 joule in the new system of units, we must express the definition of 1 joule in terms of the new units of mass, length, and time.
First, let’s recall that the joule (J) in the SI system is defined as:
[tex]\[ 1 \, \text{J} = 1 \, \text{kg} \cdot \left(1 \, \text{m}\right)^2 \cdot \left(1 \, \text{s}^{-2}\right) \][/tex]
In the new system:
- Mass is measured in multiples of [tex]\(10 \, \text{kg}\)[/tex], so [tex]\(1 \text{ mass unit} = 10 \, \text{kg}\)[/tex].
- Length is measured in multiples of [tex]\(1 \, \text{km}\)[/tex] or [tex]\(1000 \, \text{m}\)[/tex], so [tex]\(1 \text{ length unit} = 1000 \, \text{m}\)[/tex].
- Time is measured in multiples of [tex]\(100 \, \text{s}\)[/tex], so [tex]\(1 \text{ time unit} = 100 \, \text{s}\)[/tex].
To convert 1 joule (J) into the new system of units, we substitute these new units into the joule’s definition. We have:
[tex]\[ 1 \, \text{J} = 1 \, (\text{new mass unit}) \left(\text{new length unit}\right)^2 \left(\text{new time unit}\right)^{-2} \][/tex]
Inserting the values given for new mass, new length, and new time:
[tex]\[ 1 \, \text{J} = 1 \times 10 \, \text{kg} \times \left(1000 \, \text{m}\right)^2 \times \left(100 \, \text{s}\right)^{-2} \][/tex]
Calculate the exponents:
[tex]\[ 1 \, \text{J} = 1 \times 10 \, \text{kg} \times 1000000 \, \text{m}^2 \times \left(100 \, \text{s}\right)^{-2} \][/tex]
Now, break it down:
[tex]\[ 1000000 \, \text{m}^2 \text{ is } 10^6 \, \text{m}^2 \][/tex]
[tex]\[ \left(100 \, \text{s}\right)^{-2} \text{ is } \left(10^2 \right)^{-2} = 10^{-4} \, \text{s}^{-2} \][/tex]
Thus:
[tex]\[ 1 \, \text{J} = 10 \times 10^6 \times 10^{-4} \][/tex]
Combine the factors of 10:
[tex]\[ 1 \, \text{J} = 10 \times 10^{6-4} \][/tex]
[tex]\[ 1 \, \text{J} = 10 \times 10^2 \][/tex]
[tex]\[ 1 \, \text{J} = 10 \times 100 \][/tex]
[tex]\[ 1 \, \text{J} = 1000 \][/tex]
Therefore, the numerical value of 1 joule in the new system of units is:
[tex]\[ \boxed{1000.0} \][/tex]
So, the correct answer is neither (1) [tex]\(10^{-1}\)[/tex], (2) [tex]\(10^{-2}\)[/tex], (3) [tex]\(10^{-3}\)[/tex], nor (4) 10, but rather [tex]\(1000.0\)[/tex]. It appears the question may have an oversight in the available options.
First, let’s recall that the joule (J) in the SI system is defined as:
[tex]\[ 1 \, \text{J} = 1 \, \text{kg} \cdot \left(1 \, \text{m}\right)^2 \cdot \left(1 \, \text{s}^{-2}\right) \][/tex]
In the new system:
- Mass is measured in multiples of [tex]\(10 \, \text{kg}\)[/tex], so [tex]\(1 \text{ mass unit} = 10 \, \text{kg}\)[/tex].
- Length is measured in multiples of [tex]\(1 \, \text{km}\)[/tex] or [tex]\(1000 \, \text{m}\)[/tex], so [tex]\(1 \text{ length unit} = 1000 \, \text{m}\)[/tex].
- Time is measured in multiples of [tex]\(100 \, \text{s}\)[/tex], so [tex]\(1 \text{ time unit} = 100 \, \text{s}\)[/tex].
To convert 1 joule (J) into the new system of units, we substitute these new units into the joule’s definition. We have:
[tex]\[ 1 \, \text{J} = 1 \, (\text{new mass unit}) \left(\text{new length unit}\right)^2 \left(\text{new time unit}\right)^{-2} \][/tex]
Inserting the values given for new mass, new length, and new time:
[tex]\[ 1 \, \text{J} = 1 \times 10 \, \text{kg} \times \left(1000 \, \text{m}\right)^2 \times \left(100 \, \text{s}\right)^{-2} \][/tex]
Calculate the exponents:
[tex]\[ 1 \, \text{J} = 1 \times 10 \, \text{kg} \times 1000000 \, \text{m}^2 \times \left(100 \, \text{s}\right)^{-2} \][/tex]
Now, break it down:
[tex]\[ 1000000 \, \text{m}^2 \text{ is } 10^6 \, \text{m}^2 \][/tex]
[tex]\[ \left(100 \, \text{s}\right)^{-2} \text{ is } \left(10^2 \right)^{-2} = 10^{-4} \, \text{s}^{-2} \][/tex]
Thus:
[tex]\[ 1 \, \text{J} = 10 \times 10^6 \times 10^{-4} \][/tex]
Combine the factors of 10:
[tex]\[ 1 \, \text{J} = 10 \times 10^{6-4} \][/tex]
[tex]\[ 1 \, \text{J} = 10 \times 10^2 \][/tex]
[tex]\[ 1 \, \text{J} = 10 \times 100 \][/tex]
[tex]\[ 1 \, \text{J} = 1000 \][/tex]
Therefore, the numerical value of 1 joule in the new system of units is:
[tex]\[ \boxed{1000.0} \][/tex]
So, the correct answer is neither (1) [tex]\(10^{-1}\)[/tex], (2) [tex]\(10^{-2}\)[/tex], (3) [tex]\(10^{-3}\)[/tex], nor (4) 10, but rather [tex]\(1000.0\)[/tex]. It appears the question may have an oversight in the available options.
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