TS EAMCET · Physics · Rotational Motion
The diameter of a flywheel is \(1 \mathrm{~m}\). It has a mass of \(20 \mathrm{~kg}\). It is rotating about its axis with a speed of 120 rotations in one minute. Its angular momentum in \(\mathrm{kg}-\mathrm{m}^2 / \mathrm{s}\) is
- A \(13.4\)
- B \(31.4\)
- C \(41.4\)
- D \(43.4\)
Answer & Solution
Correct Answer
(B) \(31.4\)
Step-by-step Solution
Detailed explanation
\begin{aligned} & r=\frac{1}{2} \mathrm{~m}=0.5 \mathrm{~m}, m=20 \mathrm{~kg}, \\ & n=120 \text { rotation per minute, } \\ &=2 \text { rotation per sec. } \\ & \text { Angular momentum } L=I \omega \\ &=\frac{M r^2}{2} 2 \pi n=\frac{20 \times(0.5)^2}{2} \times 2 \times 3.14…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- The diagram shown below indicates two paths along which a sample of gas can be taken from state to state . The energy equal to in the form of heat is required to be transferred if the Path- is chosen. How much energy in the form of heat should be transferred if Path- is chosen?
TS EAMCET 2020 Medium - If the bulk modulus of water is \(2 \times 10^9 \mathrm{Nm}^{-2}\), then the required pressure to reduce the given volume of water by \(2 \%\) isTS EAMCET 2020 Easy
- Calculate the wavelength of the \(k_a\) line for \(z=31\), when \(a=5 \times 10^7 \mathrm{~Hz}^{1 / 2}\) for a characteristic X-ray spectrum.TS EAMCET 2011 Medium
- In a meter bridge two gaps in the metallic strip are connected by \(3 \Omega\) and \(9 \Omega\) resistors. What should be the value of shunt that needs to be added to \(9 \Omega\) resistor to shift balancing point by \(25 \mathrm{~cm}\) ?TS EAMCET 2020 Easy
- A metal metre scale that is accurate up to 0.5 mm is made at a temperature of \(25^{\circ} \mathrm{C}\). The range of temperatures within which it can be used is
(Coefficient of linear expansion of the metal \(=10^{-5} /{ }^{\circ} \mathrm{C}\) )TS EAMCET 2025 Medium - The distance for which ray optics becomes a good approximation for an aperture of 0.3 cm and a light of wavelength \(6000 Å\) isTS EAMCET 2025 Medium
More PYQs from TS EAMCET
- A fly-wheel of mass \(25 \mathrm{~kg}\) has a radius of \(0.2 \mathrm{~m}\). It is making \(240 \mathrm{rpm}\). What is the torque necessary to bring to rest in \(20 \mathrm{~s}\) ?TS EAMCET 2010 Medium
- A hollow metal sphere of radius \(15 \mathrm{~cm}\) is charged such that potential on its surface is \(20 \mathrm{~V}\). Then, the potential at the centre of sphere isTS EAMCET 2021 Easy
- Which of the following statements is NOT true?TS EAMCET 2022 Easy
- A car of mass \(1200 \mathrm{~kg}\) (together with the driver) is moving with a constant acceleration of \(2 \mathrm{~m} / \mathrm{s}^2\). How much power does the engine generate at the instance, when the speed reaches \(20 \mathrm{~m} / \mathrm{s}\) ? (Assume that the coefficient of friction between the car and the road is 0.5 ).TS EAMCET 2018 Easy
- For a system to follow the law of conservation of linear momentum during a collision, the condition is : (1) total external force acting on the system is zero. (2) total external force acting on the system is finite and time of collision is negligible. (3) total internal force acting on the system is zero.TS EAMCET 2006 Medium
- The equation of a transverse wave propagating on a stretched string is given by \(y=3 \sin (4 x+200 \mathrm{t})\), where \(x\) and \(y\) are in metre and the time ' t ' is in second. If the tension applied to the string is 500 N, the linear density of the string isTS EAMCET 2025 Medium