MCQ
A swimmer while jumping into river from a height easily forms a loop in air if
- ✓He pulls his arms and legs in
- BHe spreads his arms and legs
- CHe keeps himself straight
- DNone of these
✓
Answer
Correct option: A.
He pulls his arms and legs in
a
(a)
(a)
Using angular momentum conservation, by pulling his arms and legs in, Moment of inertia will decrease hence $\omega$ will increase.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A resistance of $40\, \Omega$ and an inductance of $95.5$ millihenry are connected in series in a $50$ cycles/second ac circuit. The impedance of this combination is very nearly.....$ohm$
→Two blocks of mass $1\ kg$ and $2\ kg$ are connected with each other with a spring of spring constant $60\ N/m$. If the velocity given to the block of mass $ 2\ kg$ at the natural length is $6\ m/s$. Find the maximum veloicty of $1\ kg$ block in subsequent motion (in $m/s$).
→A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is $B$. It is then bent into a circular loop of $n$ $turns$. The magnetic field at the centre of the coil will be
→A cyclic process $ABCD$ is shown in the given $P-V$ diagram. $P-T$ diagram that represents the same process is
→Match List$-I$ with List$-II$
→| List $-I$ | List $-II$ |
| $(A)$ Moment of inertia of solid sphere of radius $(R)$ about any tangent | $(I)$ $\frac{5}{3} MR ^{2}$ |
| $(B)$ Moment of inertia of hollow sphere of radius $(R)$ about any tangent | $(II)$ $\frac{7}{5} MR ^{2}$ |
| $(C)$ Moment of inertia of circular ring of radius $(R)$ about its diameter. | $(III)$ $\frac{1}{4} MR ^{2}$ |
| $(D)$ Moment of inertia of circular disc of radius $(R)$ about any diameter. | $(IV)$ $\frac{1}{2} MR ^{2}$ |
Question: Choose the correct answer from the options given below
Assume that Solar constant is $1.4 \,kW / m ^2$, radius of sun is $7 \times 10^5 \,km$ and the distance of earth from centre of sun is $1.5 \times 10^{8} \,km$. Stefan's constant is $5.67 \times 10^{-6} \,Wm ^{-2} K ^{-4}$, find the approximate temperature of sun ....... $K$
→How is the temperature of stars determined by
What is the effect on Fresnel’s biprism experiment when the use of white light is made
The correct graph between the maximum energy of a photoelectron and the inverse of wavelength of the incident radiation is given by the curve
A long, straight wire of radius $a$ carries a current distributed uniformly over its cross-section. The ratio of the magnetic fields due to the wire at distance $\frac{a}{3}$ and $2 a,$ respectively from the axis of the wire is
→