A thin horizontal circular disc is rotating about a vertical axis… - Vidyadip

MCQ

A thin horizontal circular disc is rotating about a vertical axis passing through its centre. An insect is at rest at a point near the rim of the d isc. The insect now moves along a diameter of the disc to reach its other end . During the journey of the insect, the angular speed of the disc.

A
continuously decreases
✓
continuously increases
C
first increases and then decreases
D
remains unchanged

✓

Answer

Correct option: B.

continuously increases

b
As insect moves along a diameter, the effective mass and hence the $M.I.$ first decreases then increases so from principle of conservation of angular momentum, angular speed, first increases then decreases.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

JEE STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Beats are produced by two waves given by ${y_1} = a\sin 2000\,\pi t$ and ${y_2} = a\sin 2008\,\pi t$. The number of beats heard per second is

A circular ring carries a uniformly distributed positive charge. The electric field $(E) $ and potential $ (V) $ varies with distance $(r)$ from the centre of the ring along its axis as

Two moles of monoatomic gas is expanded from $(P_0, V_0)$ to $(P_0 , 2V_0)$ under isobaric condition. Let $\Delta Q_1$, be the heat given to the gas, $\Delta W_1$ the work done by the gas and $\Delta U_1$ the change in internal energy. Now the monoatomic gas is replaced by a diatomic gas. Other conditions remaining the same. The corresponding values in this case are $\Delta Q_2 , \Delta W_2 , \Delta U_2$ respectively, then

the given potentiometer has its wire of resistance $10\, \Omega$. When the sliding contact is in the middle of the potentiometer wire, the potential drop across $2\, \Omega$ resistor is -

Which of the following cannot be obtained from an $IC$?

The coefficient of static friction, $\mu _s$ between block $A$ of mass $2\,kg$ and the table as shown in the figure is $0.2$. What would be the maximum mass value of block $B$ so that the two blocks $B$ so that the two blocks do not move? The string and the pulley are assumed to be smooth and masseless ....... $kg$ $(g = 10\,m/s^2)$

Work done in splitting a drop of water of $1 \,mm $ radius into $10^6$ droplets is (Surface tension of water $ = 72 \times {10^{ - 3}}J/{m^2})$

A capacitor is connected to a cell of $emf$ $E$ having some internal resistance $r$. The potential difference across the

It is possible to distinguish between the transverse and longitudinal waves by studying the property of

For the $P-V$ diagram given for an ideal gas, out of the following which one correctly represents the $T-P$ diagram ?