AP EAMCET · PHYSICS · Gravitation
Work done in raising a body of mass \(m\) from the surface of the earth to a height \(\frac{R}{3}\) is ......... (where, \(R\) is radius of earth, \(M\) is mass of the earth and \(G\) is gravitational constant)
- A \(\frac{G M m}{4 R}\)
- B \(\frac{4 G M m}{R}\)
- C \(\frac{3 G M m}{4 R}\)
- D \(\frac{G M m}{3 R}\)
Answer & Solution
Correct Answer
(A) \(\frac{G M m}{4 R}\)
Step-by-step Solution
Detailed explanation
At surface, gravitational potential energy, \[ U_1=\frac{-G M m}{R} \] At height \(n R, U_2=\frac{-G M m}{R+n R}\)…
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
- A circular well of diameter 2 m has water upto the ground level. If the bottom of the well is at a depth of 14 m, the time taken in seconds to empty the well using a 1.4 kW motor is (Acceleration due to gravity \(=10 \mathrm{~m} \mathrm{~s}^{-2}\) )AP EAMCET 2025 Medium
- When a vibrating tuning fork is placed on a sound box of a sonometer, 8 beats per second are heard when the length of the sonometer wire is kept at \(101 \mathrm{~cm}\) or \(100 \mathrm{~cm}\). Then the frequency of the tuning fork is (Consider that the tension in the wire is kept constant)AP EAMCET 2012 Easy
- In space the electric potential varies as \(V=20|\vec{r}|\) volt, where \(\vec{r}=x \hat{i}+y \hat{j}+z \hat{k}\) is the position vector. Then electric field in \(\left(\mathrm{N} \mathrm{C}^{-1}\right)\) at the point \((4 \mathrm{~m}, 3 \mathrm{~m},-5 \mathrm{~m})\) isAP EAMCET 2025 Medium
- Two concentric hollow spherical shells have radii \(r\) and \(R(R \gg r)\). A charge \(Q\) is distributed on them such that the surface charge densities are equal. The electric potential at the centre isAP EAMCET 2014 Medium
- Two position vectors are given by \(\overrightarrow{r_1}=(1,1,1)\) and \(\overrightarrow{r_2}=(1,-1,1)\). The unit vector in the direction of \(\overrightarrow{r_1} \times \overrightarrow{r_2}\)AP EAMCET 2022 Medium
- The absorption coefficient value of a perfect black body isAP EAMCET 2024 Easy
More PYQs from AP EAMCET
- . A bullet of mass \(0.01 \mathrm{~kg}\) travelling at a speed of \(500 \mathrm{~ms}^{-1}\) strikes a block of mass \(2 \mathrm{~kg}\) which is suspended by a string of length \(5 \mathrm{~m}\). The centre of gravity of the block is found to rise a vertical distance of \(0.1 \mathrm{~m}\). What is the speed of the bullet after it emerges from the block?AP EAMCET 2020 Hard
- If \((l, m)\) is the circumcentre of an equilateral triangle inscribed in the ellipse \(\frac{x^2}{a^2}+\frac{y^2}{b^2}=1\) having vertices at points with eccentric angles \(\theta_1, \theta_2\) and \(\theta_3\), then \(\frac{2}{3}\left[\cos \left(\theta_1-\theta_2\right)+\cos \left(\theta_2-\theta_3\right)+\cos \left(\theta_3-\theta_1\right)\right]=\)AP EAMCET 2019 Medium
- Two charged particles of specific charges in the ratio \(2: 1\) and masses in the ratio 1 : 4 moving with same kinetic energy enter a uniform magnetic field at right angles to the direction of the field. The ratio of the radii of the circular paths in which the particles move under the influence of the magnetic field isAP EAMCET 2025 Medium
- Thiamine isAP EAMCET 2022 Easy
- \(\lim _{n \rightarrow \infty}\left(\frac{1}{\sqrt{n^2}}+\frac{1}{\sqrt{n^2-1}}+\ldots .+\frac{1}{\sqrt{n^2-(n-1)^2}}\right)=\)AP EAMCET 2024 Medium
- Among the following processes, for which process, the change in entropy \((\Delta S)\) is negative?AP EAMCET 2020 Easy