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The value of x, y and z respectively in the expression M\(^x\) L\(^y\)T \(^z\) for the universal...

Physics
JAMB 2009

The value of x, y and z respectively in the expression M\(^x\) L\(^y\)T \(^z\) for the universal gravitational constant G are?

  • A. 2, -3, -2
  • B. -1, 3, -2
  • C. -1, 2, -3
  • D. -2, -1, 3
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Correct Answer: Option B
Explanation

F ∝ \(\frac{M_1 M_2}{r^2}\)

F = \(\frac{GM_1M_2}{r^2}\) 

where F is the force of attraction
M\(_1\) and M\(_2\) are the masses of the two bodies, r is the distance between them, and G is the universal gravitational constant

Therefore, G = \(\frac{Fr^2}{M_1M_2}\)

Dimension for F = \(\frac{\text{ML}}{T.T}\) = MLT\(^{-2}\)
The dimension for G = \(\frac{MLT^{-2}L^2}{M.M}\) = \(\frac{L^3T^{-2}}{M}\)

= M\(^{-1}\)L\(^3\)T\(^{-2}\)
In comparison with M\(^x\)L\(^y\)T\(^z\), the values for x, y and z = -1, 3, -2

 

There is an explanation video available below.


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Explanation Video

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