COMEDK · Physics · 5. Laws of Motion
A uniform chain of length \(L\) is lying partly on a table, the remaining part hanging down from the edge of the table. If the coefficient of friction between the chain and the table is \(0.5\), what is the minimum length of the chain that should lie on the table, to prevent the chain from slipping down to the ground?
- A \(L / 3\)
- B \(L / 2\)
- C \(2 L / 3\)
- D \(3 L / 4\)
Answer & Solution
Correct Answer
(C) \(2 L / 3\)
Step-by-step Solution
Detailed explanation
Let length of chain lying the table be \(y\). Mass per unit length of the chain \(=\frac{M}{L}\) Mass of the chain lying on the table, \(M^{\prime}=\frac{M}{L} \cdot y\) Mass of the length \((L-y)\) of hanging chain \(=\frac{M}{L}(L-y)\) At equilibrium, Friction force between…
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
- Blue colour of sea water is due toCOMEDK 2018 Easy
- A beam of parallel rays is brought to a focus by a plano-convex lens. A thin concave lens of the same focal length is joined to the first lens. The effect of this isCOMEDK 2019 Medium
- To get an output \(Y=1\) from the circuit shown, the inputs \(A, B\) and \(C\) must be respectively
COMEDK 2018 Easy - \(\text { If the nuclear radius of }{ }^{27} \mathrm{Al} \text { is } 3.6 \text { fermi, the nuclear radius of }{ }^{125} \mathrm{Fe} \text { is }\)COMEDK 2024 Easy
- Find the binding energy of the tritium nucleus:
[Given: mass of \(1 \mathrm{H}^3=3.01605 \mathrm{~u} ; \mathrm{~m}_{\mathrm{p}}=1.00782 \mathrm{~u} ; \mathrm{~m}_{\mathrm{n}}=1.00866 \mathrm{~u}\).]COMEDK 2024 Medium - Momentum of a body is increased to three times its original value. By what percentage will its kinetic energy change?COMEDK 2025 Medium
More PYQs from COMEDK
- If reaction is \(\mathrm{R}\) and coefficient of friction is \(\mu\), what is work done against friction in moving a body by distance \(\mathrm{d}\) ?COMEDK 2023 Easy
- The relative errors in the measurement of two lengths \(1.02 \mathrm{~cm} \pm 0.01 \mathrm{~cm}\) and \(9.89 \mathrm{~cm} \pm 0.01 \mathrm{~cm}\) isCOMEDK 2021 Easy
- Which of the following statements is not true?COMEDK 2012 Medium
- In a 12 storey house, 10 people enter a lift cabin. It is known that they will leave the lift in pre-decided groups of 2, 3 & 5 people at different storeys. The number of ways they can do so if the lift does not stop up to the second storey isCOMEDK 2023 Medium
- Oxygen is 16 times heavier than hydrogen. Equal volumes of hydrogen and oxygen are mixe(d)The ratio of speed of sound in the mixture to that in hydrogen isCOMEDK 2019 Easy
- The altitude of a cone is 20 cm and its semi vertical angle is \(30^\circ\). If the semi vertical angle is increasing at the rate of 2 radians per second, then the radius of the base is increasing at the rate ofCOMEDK 2023 Medium