TS EAMCET · Physics · Work Power Energy
A wheel which is initially at rest is subjected to a constant angular acceleration about its axis. It rotates through an angle of \(15^{\circ}\) in time \(t\) sec. The increase in angle through which it rotates in the next \(2 t \mathrm{sec}\) is
- A \(90^{\circ}\)
- B \(120^{\circ}\)
- C \(30^{\circ}\)
- D \(45^{\circ}\)
Answer & Solution
Correct Answer
(B) \(120^{\circ}\)
Step-by-step Solution
Detailed explanation
If angular acceleration is constant, we have \[ \theta=\omega_0 t+\frac{1}{2} \alpha t^2 \] The given \(\theta=15^{\circ}\) \[ \omega_0=0 \] For the first conditions (time \(=t \mathrm{sec}\) )…
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
- In a meter bridge a \(30 \Omega\) resistance is connected in the left gap and a pair of resistances \(P\) and \(Q\) in the right gap. Measured from the left, the balance point is \(37.5 \mathrm{~cm}\), when \(P\) and \(Q\) are in series and \(71.4 \mathrm{~cm}\) they are in parallel. The values of \(P\) and \(Q\) (in \(\Omega\) ) areTS EAMCET 2005 Hard
- Two positive point charges are separated by a distance of 4 m in air. If the sum of the two charges is \(36 \mu \mathrm{C}\) and the electrostatic force between them is 0.18 N , then the bigger charge isTS EAMCET 2024 Easy
- A thermally insulated vessel containing monatomic gas is moving with a speed of \(30 \mathrm{~m} / \mathrm{s}\). If the vessel suddenly stops, the increase in gas temperature is (Molar mass of gas \(=83 \mathrm{~g} / \mathrm{mol}\) and \(R=8.3 \mathrm{~J} / \mathrm{K} \mathrm{mol}\) )TS EAMCET 2019 Easy
- The refractive index of a material of a planoconcave lens is \(5 / 3\), the radius of curvature is \(0.3 \mathrm{~m}\). The focal length of the lens in air isTS EAMCET 2008 Easy
- An aluminium rod of length \(1 \mathrm{~m}\) and a steel rod of length \(2 \mathrm{~m}\) both having same cross-sectional area, are soldered together end-to-end. The thermal conductivity of aluminium rod and steel rod is \(200 \mathrm{Js}^{-1} \mathrm{~m}^{-1} \mathrm{~K}^{-1}\) and \(50 \mathrm{Js}^{-1} \mathrm{~m}^{-1} \mathrm{~K}^{-1}\) respectively. The temperatures of the free ends are maintained at \(300 \mathrm{~K}\) and \(500 \mathrm{~K}\). What is the temperature of the junction?
TS EAMCET 2018 Medium - A circular wire loop of radius, carries a total charge of, distributed uniformly over its length. A small length of, of wire is cut off. The magnitude of the electric field at the centre due to the remaining wire is,
(Assume SI units)
TS EAMCET 2021 Easy
More PYQs from TS EAMCET
- A magnetic field of \(5 \times 10^{-5} \mathrm{~T}\) is produced at a perpendicular distance of \(0.2 \mathrm{~m}\) from a long straight wire carrying electric current. If the permeability of free space is \(4 \pi \times 10^{-7} \mathrm{~T} \mathrm{~m} / \mathrm{A}\). The current passing through the wire in \(\mathrm{A}\) isTS EAMCET 2019 Easy
- A block of mass \(2 \mathrm{~kg}\) is initially at rest on a horizontal frictionless surface. A horizontal force \(\overrightarrow{\mathbf{F}}=\left(9-x^2\right) \hat{\mathbf{i}}\) newtons acts on it, when the block is at \(x=0\). The maximum kinetic energy of the block between \(x=0\) and \(x=3 \mathrm{~m}\) in joule isTS EAMCET 2004 Medium
-
Momentum before collision,
\(
p_1=4 m v_1-2 m v_2
\)
Momentum after collision,
\(
p_2=6 m\left(-5 v_2\right)=-30 m v_2
\)
Conservation of momentum gives,
\(
\begin{gathered}
p_1=p_2 \\
\Rightarrow \quad 4 m v_1-2 m v_2=-30 m v_2 \quad \Rightarrow 4 v_1=-32 v_2 \\
\Rightarrow \quad \frac{v_1}{v_2}=\frac{-32}{4}=-8 \text { or }\left|\frac{v_1}{v_2}\right|=8
\end{gathered}
\)TS EAMCET 2018 Hard - The change in current through a junction diode is \(12 \mathrm{~mA}\) when the forward bias voltage is changed by \(0.6 \mathrm{~V}\). The dynamic resistance isTS EAMCET 2016 Easy
- Which of the following is desirable for making permanent magnets?TS EAMCET 2020 Easy
- The ground state energy of hydrogen atom is -13.6 eV . The potential energy of the electron in the first excited state of hydrogen isTS EAMCET 2024 Easy