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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 ∝ M1M2
__r2

 

 

=> F = GM1M2
__r2


where F is the force of attraction
M1 and M2 are masses of the two bodies, r is the distance between them, and G is the universal gravitational constant

 

 

 

∴ G = _Fr2
M1M2

 

 

∴ dimension for force, F = ML = MLT-2
T.T

 

 

The dimension for G = MLT-2L2 = L3T-2
_MM _M


= M-1L3T-2
In comparison with MxLyTz, 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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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts