COMEDK · Physics · 5. Laws of Motion
A cube bar slides thrice the time with friction than that without friction when it slides on an inclined plane of inclination \(45^{\circ}\). The coefficient of friction between the block and the surface is
- A 0.66
- B 0.5
- C 0.88
- D 1
Answer & Solution
Correct Answer
(C) 0.88
Step-by-step Solution
Detailed explanation
For a block sliding down an inclined plane of angle \(\theta\) without friction, the acceleration is \(a_1 = g \sin \theta\). The time taken to cover a distance \(s\) is \(t_1 = \sqrt{\dfrac{2s}{a_1}} = \sqrt{\dfrac{2s}{g \sin \theta}}\). For a block sliding down with friction,…
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
- Momentum of a body is increased to three times its original value. By what percentage will its kinetic energy change?COMEDK 2025 Medium
- How many \(6 \mu \mathrm{F}, 200 \mathrm{~V}\) condensers are needed to make a condenser of \(18 \mu \mathrm{F}, 600 \mathrm{~V}\) ?\COMEDK 2018 Medium
- A body of mass 10 kg is moving up on an inclined plane of \(30^{\circ}\) with an acceleration \(2 \mathrm{~ms}^{-2}\). Find the force required, if the coefficient of friction between the object and the plane surface is \(\dfrac{\sqrt{3}}{6}\), [given \(g=10 \mathrm{~ms}^{-2}\) ].COMEDK 2025 Medium
- The energy that should be added to an electron to reduce its de-Broglie wavelength from \(1 \mathrm{~nm}\) to \(0.5 \mathrm{~nm}\) isCOMEDK 2017 Easy
- A bicycle generator crcates \(1.5 \mathrm{~V}\) at \(15 \mathrm{~km} / \mathrm{h}\). The cmf generated at \(10 \mathrm{~km} / \mathrm{h}\) isCOMEDK 2015 Easy
- Speed of electromagnetic wave in a medium having relative permittivity \(\varepsilon_r\) and relative permeability \(\mu_r\) is (speed of light in air, \(\left.c=3 \times 10^8 \mathrm{~m} / \mathrm{s}\right)\)COMEDK 2022 Easy
More PYQs from COMEDK
- What is the probability of a randomly chosen 2 digit number being divisible by 3 ?COMEDK 2024 Easy
- Let R be a relation on natural numbers defined by \(x+2 y=8, x, y \in N\). The domain of R isCOMEDK 2025 Easy
- The direction ratios of the line which is perpendicular to the lines \(\frac{x-7}{2}=\frac{y+17}{-3}=\frac{z-6}{1}\) and \(\frac{x+5}{1}=\frac{y+3}{2}=\frac{z-4}{-2}\) areCOMEDK 2015 Medium
- A cylinder of radius \(r\) and of thermal conductivity \(K_1\) is surrounded by a cylindrical shell of inner radius \(r\) and outer radius \(2 r\) made of a material of thermal conductivity \(K_2\). The effective thermal conductivity of the system isCOMEDK 2023 Medium
- If \(\mathbf{a} \hat{\mathfrak{i}}=\mathbf{a}(\hat{\hat{i}}+\hat{\hat{j}})=\mathbf{a}(\hat{\mathbf{i}}+\hat{\hat{b}}+\hat{\mathbf{k}})=1\), then \(\mathbf{a}=\)COMEDK 2019 Easy
- \(\sin ^{2} 175^{\circ}+\sin ^{2} 725^{\circ}\) is equal toCOMEDK 2020 Easy