JEE Mains · Physics · STD 11 - 4.1 newtons laws of motion
A block of \(\sqrt{3}\,kg\) is attached to a string whose other end is attached to the wall. An unknown force \(F\) is applied so that the string makes an angle of \(30^{\circ}\) with the wall. The tension \(T\) is \(...........\,N\) :(Given \(g =10\,ms ^{-2}\) )
- A \(20\)
- B \(25\)
- C \(10\)
- D \(15\)
Answer & Solution
Correct Answer
(A) \(20\)
Step-by-step Solution
Detailed explanation
\(\theta=30^{\circ}\) \(\cos \theta=\frac{\sqrt{3} g }{ T }\) \(\Rightarrow \frac{\sqrt{3}}{2}=\frac{\sqrt{3} g }{ T }\) \(\Rightarrow T =20\,N\)
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 charge particle is moving in a uniform magnetic field \((2 \hat{i}+3 \hat{j}) T\). If it has an acceleration of \((\alpha \hat{i}-4 \hat{j}) m / s ^{2}\), then the value of \(\alpha\) will be.JEE Mains 2022 Hard
- The electric field in an electromagnetic wave is given by \(E =56.5 \sin \omega( t - x / c ) \;NC ^{-1}\). Find the intensity of the wave if it is propagating along \(x-\)axis in the free space. (Given \(\left.\varepsilon_{0}=8.85 \times 10^{-12} \;C ^{2} N ^{-1} m ^{-2}\right)\)JEE Mains 2022 Medium
- A person pushes a box on a rough horizontal platform surface. He applies a force of \(200\, N\) over a distance of \(15\, m .\) Thereafter, he gets progressively tired and his applied force reduces linearly with distance of \(100\, N\). The total distance through which the box has been moved is \(30\, m\). What is the work done by the person during the total movement of the box\(........J\)\(?\)JEE Mains 2020 Hard
- If \({R}_{{E}}\) be the radius of Earth, then the ratio between the acceleration due to gravity at a depth \(' {r} '\) below and a height \(' r '\) above the earth surface is: (Given : \(\left.{r}<{R}_{{E}}\right)\)JEE Mains 2021 Medium
- A proton and an electron have the same de Broglie wavelength. If \(K_p\) and \(K_e\) be the kinetic energies of proton and electron respectively. Then choose the correct relation :JEE Mains 2024 Hard
- A photon is emitted in transition from \(n =4\) to \(n =1\) level in hydrogen atom. The corresponding wavelength for this transition is \(.........\,nm\) \(\text { (given, } h =4 \times 10^{-15} eVs \text { ) : }\)JEE Mains 2023 Medium
More PYQs from JEE Mains
- With what speed should a galaxy move outward with respect to earth so that the sodium-D line at wavelength \(5890\) \(\stackrel{\circ}{{A}}\) is observed at \(5896\) \(\stackrel{\circ}{{A}}\) ? (in \({km} / {sec}\))JEE Mains 2021 Medium
- The initial speed of a bullet fired from a rifle is \(630\, m/s\). The rifle is fired at the centre of a target \(700\, m\) away at the same level as the target. How far above the center of the target (in \(m\)) the rifle must be aimed in order to hit the target? (Take \(g=10 \;m/s^2\))JEE Mains 2014 Hard
- If \(\alpha \) and \( \beta \) are roots of the equation, \({x^2} - 4\sqrt 2\,kx + 2\,{e^{4\ln \,k}} - 1 = 0\) for some \(k\), and \({\alpha ^2} + {\beta ^2} = 66\), then \({\alpha ^3} + {\beta ^3}\) is equal toJEE Mains 2014 Hard
- Let \(\mathrm{f}: \mathbf{R} \rightarrow \mathbf{R}\) be a twice differentiable function such that \(f(2)=1\). If \(\mathrm{F}(x)=x f(x)\) for all \(x \in \mathbf{R}\), \(\int_0^2 x \mathrm{~F}^{\prime}(x) \mathrm{d} x=6\) and \(\int_0^2 x^2 \mathrm{~F}^{\prime \prime}(x) \mathrm{d} x=40\), then \(\mathrm{F}^{\prime}(2)+\int_0^2 \mathrm{~F}(x) \mathrm{d} x\) is equal to :JEE Mains 2025 Medium
- Given below are two statements : Statement \(I\) : When the white light passed through a prism, the red light bends lesser than yellow and violet. Statement \(II\) : The refractive indices are different for different wavelengths in dispersive medium.
In the light of the above statements, choose the correct answer from the options given below :JEE Mains 2024 Hard - If \(\operatorname{Re}\left(\frac{z-1}{2 z+i}\right)=1,\) where \(z=x+i y,\) then the point \((\mathrm{x}, \mathrm{y})\) lies on aJEE Mains 2020 Hard