TS EAMCET · Physics · Rotational Motion
A thin circular disc of mass \(12 \mathrm{~kg}\) and radius \(0.5 \mathrm{~m}\) rotates with an angular velocity of \(100 \mathrm{rad} / \mathrm{s}\). The rotational kinetic energy of the disc is
- A \(12.2 \mathrm{~kJ}\)
- B \(5.5 \mathrm{~kJ}\)
- C \(9.2 \mathrm{~kJ}\)
- D \(7.5 \mathrm{~kJ}\)
Answer & Solution
Correct Answer
(D) \(7.5 \mathrm{~kJ}\)
Step-by-step Solution
Detailed explanation
Given, mass of a circular disc, \(M=12 \mathrm{~kg}\), radius, \(R=0.5 \mathrm{~m}\), angular velocity, \(\omega=100 \mathrm{rad} / \mathrm{s}\) \(\therefore\) Rotational kinetic energy of the disc,…
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 ratio of linear expansivity to the co-efficient of a real expansion of a rectangular sheet of a solid isTS EAMCET 2021 Medium
- In the logic circuit given below; if \(X=1\) and \(Y=1\) then the values of \(\mathrm{P}, \mathrm{Q}\) and \(\mathrm{R}\) are
TS EAMCET 2023 Medium - An ideal gas at initial temperature \(T_0\) and initial volume \(V_0\) is expanded adiabatically to a volume \(2 V_0\). The gas is then expanded isothermally to a volume \(5 V_0\) and there after compressed adiabatically so that the temperature of the gas becomes again \(T_0\). If the final volume of the gas is \(\alpha V_0\), then the value of constant \(\alpha\) isTS EAMCET 2019 Easy
- The two surfaces of a concave lens, made of glass of refractive index 1.5 have the same radii of curvature \(R\). It is now immersed in a medium of refractive index 1.75 , then the lensTS EAMCET 2013 Hard
- A glass beaker contains \(200 \mathrm{~g}\) of carbonated water initially at \(20^{\circ} \mathrm{C}\). How much ice should be added to obtain the final temperature of \(0^{\circ} \mathrm{C}\) with all ice melted, if the initial temperature of ice is \(-10^{\circ} \mathrm{C}\). Neglect heat capacity of glass. [Take, \(C_{\text {water }}=4190 \mathrm{~J} / \mathrm{kg}^{\circ} \mathrm{C}\), \[ C_{\text {ice }}=2100 \mathrm{~J} / \mathrm{kg}^{\circ} \mathrm{C}, L_F=3.34 \times 10^5 \mathrm{~J} / \mathrm{kg} \text { ] } \]TS EAMCET 2018 Easy
- A wire of length \(l\) is bent into a circular loop of radius \(R\) and carries a current \(I\). The magnetic field at the centre of the loop is \(B\). The same wire is now bent into a double loop of equal radii. If both loops carry the same current \(I\) and it is in the same direction, the magnetic field at the centre of the double loop will beTS EAMCET 2009 Easy
More PYQs from TS EAMCET
- In a transistor, the base current is \(10 \mu \mathrm{A}\) and the emitter current is \(1 \mathrm{~mA}\), then the collector current isTS EAMCET 2023 Medium
- The number of turns in primary and secondary coils of a transformer is 50 and 200 respectively. If the current in the primary coil is \(4 \mathrm{~A}\), then the current in the secondary coil isTS EAMCET 2008 Easy
- An object cools from to in minutes, when the surrounding temperature is . Then the time taken by the object to cool from to is
[Take ]TS EAMCET 2022 Medium - Imagine a person standing on a weighing machine placed inside an elevator. The elevator first accelerates, then moves with a constant velocity and finally decelerates to stop. The maximum and minimum weight recorded are \(80 \mathrm{~kg}\) and \(64 \mathrm{~kg}\), respectively. Find out the true weight of that person considering \(\left(g=10 \mathrm{~m} / \mathrm{s}^2\right)\).TS EAMCET 2021 Easy
- A force separately produces accelerations of \(18 \mathrm{~ms}^{-2}, 9 \mathrm{~ms}^{-2}\) and \(6 \mathrm{~ms}^{-2}\) in three bodies of masses \(\mathrm{P}, \mathrm{Q}\) and R respectively. If the same force is applied on a body of mass \(\mathrm{P}+\mathrm{Q}+\mathrm{R}\), then the acceleration of that body isTS EAMCET 2025 Medium
- A wire of resistance \(2 R\) is stretched such that its length is doubled. Then the increases in its resistance isTS EAMCET 2023 Easy