WB JEE 2008 | Rotational Motion Question 1 | Physics

WB JEE 2008

MCQ (Single Correct Answer)

-0.25

Two point objects of masses 1.5 g and 2.5 g respectively are at a distance of 16 cm apart, the centre of gravity is at a distance x from the object of mass 1.5 gm where x is

10 cm

6 cm

13 cm

3 cm

WB JEE 2023

MCQ (Single Correct Answer)

-0.25

A mouse of mass m jumps on the outside edge of a rotating ceiling fan of moment of inertia I and radius R. The fractional loss of angular velocity of the fan as a result is,

$$\frac{m R^{2}}{I+m R^{2}}$$

$$\frac{I}{I+m R^{2}}$$

$$\frac{I-m R^{2}}{I}$$

$$\frac{I-m R^{2}}{I+m R^{2}}$$

WB JEE 2021

MCQ (Single Correct Answer)

-0.5

A uniform rod of length L pivoted at one end P is freely rotated in a horizontal plane with an angular velocity $$\omega$$ about a vertical axis passing through P. If the temperature of the system is increased by $$\Delta$$T, angular velocity becomes $${\omega \over 2}$$. If coefficient of linear expansion of the rod is $$\alpha$$($$\alpha$$ << 1), then $$\Delta$$T will be

$${1 \over \alpha }$$

$${1 \over 2\alpha }$$

$${1 \over 4\alpha }$$

$$\alpha$$

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