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The velocity, acceleration and force in ...

The velocity, acceleration and force in two systems of units are related as under:
(i) `v'=(alpha^(2))/(beta)v`
(ii) `a'=(alphabeta)a`
(iii) `F'=((1)/(alphabeta))F`
All the primed symbols belong to one system and unprimed ones belong to the other system. Here `alpha and beta` are dimensionless constants. Which of the following is/are correct?

A

Length standards of the two systems are related by:
`L'=((alpha^(3))/(beta^(3)))L`

B

Mass standards of the two systems are related by:
`m'=((1)/(alpha^(2)beta^(2)))m`

C

Time standards of the two systems are related by:
`T'=((alpha)/(beta^(2)))T`

D

Momentum standards of the two systems are related by:
`P'=((1)/(beta^(3)))P`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to analyze the relationships between the quantities in the two systems of units and derive the relationships for length, mass, time, and momentum. Let's break it down step by step. ### Step 1: Analyze the given relationships We have the following relationships: 1. \( v' = \frac{\alpha^2}{\beta} v \) 2. \( a' = \alpha \beta a \) 3. \( F' = \frac{1}{\alpha \beta} F \) Here, \( v' \), \( a' \), and \( F' \) are quantities in one system of units, while \( v \), \( a \), and \( F \) are in another system. The constants \( \alpha \) and \( \beta \) are dimensionless. ### Step 2: Relate the length standards From the equation for velocity: \[ v' = \frac{L'}{T'} = \frac{\alpha^2}{\beta} \frac{L}{T} \] This implies: \[ \frac{L'}{T'} = \frac{\alpha^2}{\beta} \frac{L}{T} \] Rearranging gives: \[ L' = \frac{\alpha^2}{\beta} L T' / T \] To find the relationship for length, we need to express \( T' \) in terms of \( T \). ### Step 3: Relate the acceleration standards From the equation for acceleration: \[ a' = \frac{L'}{T'^2} = \alpha \beta \frac{L}{T^2} \] This implies: \[ \frac{L'}{T'^2} = \alpha \beta \frac{L}{T^2} \] Rearranging gives: \[ L' = \alpha \beta L \frac{T'^2}{T^2} \] ### Step 4: Equate the two expressions for \( L' \) Now we have two expressions for \( L' \): 1. \( L' = \frac{\alpha^2}{\beta} L \frac{T'}{T} \) 2. \( L' = \alpha \beta L \frac{T'^2}{T^2} \) Setting them equal: \[ \frac{\alpha^2}{\beta} L \frac{T'}{T} = \alpha \beta L \frac{T'^2}{T^2} \] Cancelling \( L \) (assuming \( L \neq 0 \)): \[ \frac{\alpha^2}{\beta} \frac{T'}{T} = \alpha \beta \frac{T'^2}{T^2} \] Rearranging gives: \[ \frac{T'^2}{T'} = \frac{\alpha^3}{\beta^2} T \] Thus: \[ T' = \frac{\alpha}{\beta^2} T \] ### Step 5: Relate the mass standards From the equation for force: \[ F' = \frac{M'}{T'^2} = \frac{1}{\alpha \beta} \frac{M}{T^2} \] This implies: \[ \frac{M'}{T'^2} = \frac{1}{\alpha \beta} \frac{M}{T^2} \] Substituting \( T' \): \[ M' = \frac{1}{\alpha \beta} M \left(\frac{\alpha}{\beta^2} T\right)^{-2} \] This simplifies to: \[ M' = \frac{1}{\alpha^2 \beta^2} M \] ### Step 6: Relate the momentum standards Momentum \( P \) is defined as: \[ P = MV \] Thus: \[ P' = M'v' = \frac{1}{\alpha^2 \beta^2} M \cdot \frac{\alpha^2}{\beta} v = \frac{1}{\beta^3} P \] ### Conclusion From the analysis, we find: 1. Length standard: \( L' = \frac{\alpha^3}{\beta^3} L \) 2. Mass standard: \( M' = \frac{1}{\alpha^2 \beta^2} M \) 3. Time standard: \( T' = \frac{\alpha}{\beta^2} T \) 4. Momentum standard: \( P' = \frac{1}{\beta^3} P \) ### Final Answers - Length: \( L' = \frac{\alpha^3}{\beta^3} L \) (Correct) - Mass: \( M' = \frac{1}{\alpha^2 \beta^2} M \) (Correct) - Time: \( T' = \frac{\alpha}{\beta^2} T \) (Correct) - Momentum: \( P' = \frac{1}{\beta^3} P \) (Correct)
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