English
Hindi
1.Units, Dimensions and Measurement
easy

નીચે આપેલ જોડમાંથી કઈ એક જોડ સમાન પરિમાણી નથી ? 

A

કોણીય વેગમાન અને પ્લાન્કનો અચળાંક

B

આઘાત અને વેગમાન

C

જડત્વની ચાકમાત્રા અને બળની ગતિ

D

કાર્ય અને ટોર્ક

Solution

$(A)$: Using $\quad L = mvr =\frac{ nh }{2 \pi}$

Thus the angular momentum (L) has the same dimensions as that of Planck's constant (h)

$(B)$: Impulse $I =\Delta P$

Thus impulse $(I)$ has the same dimensions as that of linear momentum $(P)$

$(C)$: Using $\tau=I \alpha \quad \Rightarrow I=\frac{\tau}{\alpha}$

where angular acceleration is not dimensionless.

Thus the dimensions of moment of inertia are different from those of

moment of force

(OR torque)

$(D):$ Dimension of energy $E =\left[ ML ^2 T ^{-2}\right]$

Dimension of torque $\tau= Fr =\left[ ML ^2 T ^{-2}\right]$

Hence, torqua and energy have same dimensions.

Standard 11
Physics

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