TS EAMCET · Physics · Rotational Motion
Consider a rocket is being fired. The kinetic energy of the rocket is increased by times where as its total mass is reduced by half through the burning of fuel. The factor by which its momentum increases is
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
The initial kinetic energy, K.E.i=12mv2, and final kinetic energy, K.E.f=12m2v'2, given, 12×m2v'2=12×mv2×16⇒v'=32v then initial momentum, mv and final momentum, m2v'=m242v=22mv, so net momentum is increased by 22, times.
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 earth's magnetic field at the geometric poles is \(\sqrt{10} \times 10^5 \mathrm{~T}\). The magnitude of the field at a point on the earth's surface where the radius makes an angle \(\theta\) with the axis of earth's assumed magnetic dipole is \(5 \times 10^5 \mathrm{~T}\). The magnitude of \(\theta\) in degree is :TS EAMCET 2019 Medium
- The number of turns of two circular coils A and B are 300 and 200 respectively. The magnetic moments of the two coils A and B are in the ratio \(1: 2\). If the two coils carry equal currents, then the ratio of radii of coils A and B isTS EAMCET 2025 Medium
- A particle covers a distance from \(A\) to \(B\) over a period of time; the distance versus time plot is the shown below. Then which of the following is true for the motion of the particle?
TS EAMCET 2019 Easy - A thin uniform wire of mass ' \(m\) ' and linear mass density ' \(\rho\) ' is bent in the form of a circular loop. The moment of inertia of the loop about its diameter isTS EAMCET 2024 Easy
- In the diode-based rectifier circuit given below, if \(V_s=V_m \sin \omega t\) and the diode is ideal, then the average value of \(V_L\) is
TS EAMCET 2018 Medium - A block rests on a fixed wedge inclined at an angle \(\theta\). The coefficient of friction between the block and plane is \(\mu\). The maximum value of \(\theta\) for the block to remain motionless on the wedge isTS EAMCET 2020 Medium
More PYQs from TS EAMCET
- The kinetic energy of a body of mass 4 kg moving with a velocity of \((2 \hat{i}-4 \hat{j}-\hat{k}) \mathrm{ms}^{-1}\) isTS EAMCET 2024 Easy
- A proton and an alpha particle moving with equal speeds enter normally into a uniform magnetic field. The ratio of times taken by the proton and the alpha particle to make one complete revolution in the magnetic field isTS EAMCET 2025 Medium
- Some physical constants are given in List-I and their dimensional formulae are given in List-II. Match the following
List-I
(1) Planck's constant
(2) Gravitational constant
(3) Bulk modulus
(4) Coefficient of viscosity
List-II
(i) \(\left[\mathrm{ML}^{-1} \mathrm{~T}^{-2}\right]\)
(ii) \(\left[\mathrm{ML}^{-1} \mathrm{~T}^{-1}\right]\)
(iii) \(\left[\mathrm{ML}^2 \mathrm{~T}^{-1}\right]\)
(iv) \(\left[\mathrm{M}^{-1} \mathrm{~L}^3 \mathrm{~T}^{-2}\right]\)
The correct answer isTS EAMCET 2007 Easy - If the energy gap of a semiconductor used for the fabrication of an LED is nearly 1.9 eV, then the color of the light emitted by the LED isTS EAMCET 2025 Easy
- A solid cylinder of mass 2 kg, length 40 cm and radius 10 cm is placed in contact with a solid sphere of mass 0.5 kg and radius 10 cm such that the centres of the two bodies lie along the geometrical axis of the cylinder. The distance of the centre of mass of the system of two bodies from the centre of the sphere isTS EAMCET 2025 Medium
- If the radiation emitted by a perfect radiator has maximum intensity at a wavelength of \(2900 Å\), the intensity of radiation emitted by it is (Stefan-Boltzmann's constant \(=5.67 \times 10^{-8} \mathrm{Wm}^{-2} \mathrm{~K}^{-4}\) and Wein's constant \(=2.9 \times 10^{-3} \mathrm{mK}\) )TS EAMCET 2025 Medium