Recent questions in Kinematics

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asked Dec 14, 2021 in Kinematics by deepak01 (12.2k points)

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Two positive charges \(Q\) and \(4 Q\) are placed at points \(A\) and \(B\) respectively, where \(B\) is at a distance 'd' units to the right of A. The total electric potential due to these charges is minimum at P on the line through A and B. What is (are) the distance (s) of P from A?

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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Which of the following statement(s) is/are true? "Internal energy of an ideal gas

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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The intensity of a sound appears to an observer to be periodic. Which of the following can be cause of it?

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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A solid spherical ball and a hollow spherical ball of two different materials of densities \(\rho_{1}\) and \(\rho_{2}\) respectively have same outer radii and same mass. What will be the ratio the moment of inertia (about an axis passing through the centre) of the hollow sphere to that of the solid sphere?

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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A light charged particle is revolving in a circle of radius ' \(r\) ' in electrostatic attraction of a static heavy particle with opposite charge. How does the magnetic field 'B' at the centre of the circle due to the moving charge depend on 'r'?

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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An electric bulb, a capacitor, a battery and a switch are all in series in a circuit. How does the intensity of light vary when the switch is turned on ?

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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32 answers

An alternating currect is flowing through a series LCR circuit. It is found that the current reaches a value of \(1 \mathrm{~mA}\) at both \(200 \mathrm{~Hz}\) and \(800 \mathrm{~Hz}\) frequency. What is the resonance frequency of the circuit?

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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A circular loop of radius ' \(r\) ' of conducting wire connected with a voltage source of zero internal resistance produces a magnetic field 'B' at its centre. If instead, a circular loop of radius ' \(2 r\) ', made of same material, having the same cross section is connected to the same voltage source, what will be the magnetic field at its centre ?

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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A proton of mass ' \(m\) ' moving with a speed \(v(<<c\), velocity of light in vacuum) completes a circular orbit in time ' \(T\) ' in a uniform magnetic field. If the speed of the proton is increased to \(\sqrt{2} \mathrm{v}\), what will be time needed to complete the circular orbit?

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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Four equal charges of value \(+\mathrm{Q}\) are placed at any four vertices of a regular hexagon of side 'a'. By suitably choosing the vertices, what can be the maximum possible magnitude of electric field at the centre of the hexagon?

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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A point charge - \(\mathrm{q}\) is carried from a point \(A\) to another point \(B\) on the axis of a charged ring of radius ' \(r\) ' carrying a charge \(+\mathrm{q}\). If the point \(\mathrm{A}\) is at a distance \(\frac{4}{3} \mathrm{r}\) from the centre of the ring and the point \(\mathrm{B}\) is \(\frac{3}{4} \mathrm{r}\) from the centre but on the opposite side, what is the net work that need to be done for this?

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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For an ideal gas with initial pressure and volume \(P_{i}\) and \(V_{i}\), respectively, a reversible isothermal expansion happens, when its volume becomes \(V_{0}\). Then it is compressed to its original volume \(V_{i}\) by a reversible adiabatic process. If the final pressure is \(P_{f}\), then which of the following statements is true?

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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One mole of a mono-atomic ideal gas undergoes a quasi-static process, which is depicted by a straight line joining points \(\left(\mathrm{V}_{0}, \mathrm{~T}_{0}\right)\) and \(\left(2 \mathrm{~V}_{0}, 3 \mathrm{~T}_{0}\right)\) in a V-T diagram. What is the value of the heat capacity of the gas at the point \(\left(\mathrm{V}_{0}, \mathrm{~T}_{0}\right) ?\)

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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What will be the approximate terminal velocity of a rain drop of diameter \(1.8 \times 10^{-3} \mathrm{~m}\), when density of rain water \(\approx 10^{3}\) \(\mathrm{kgm}^{-3}\) and the co-efficient of viscosity if air \(\approx 1.8 \times 10^{-5} \mathrm{Nsm}^{-2}\) ? (Neglect buoyancy of air)

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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The stress along the length of a rod (with rectangular cross section) is \(1 \%\) of the Young's modulus of its material. What is the approximate percentage of change of its volume? (Poisson's ratio of the material of the rod is \(0.3\) )

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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A spherical liquid drop is placed on a horizontal plane. A small disturbance causes the volume of the drop to oscillate. The time period of oscillation \((T)\) of the liquid drop depends on radius \((r)\) of the drop, density \((\rho)\) and surface tension (s) of the liquid. Which among the following will be a possible expression for \(\mathrm{T}\) (where \(\mathrm{k}\) is a dimensionless constant) ?

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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The ratio of accelerations due to gravity \(\mathrm{g}_{1}: \mathrm{g}_{2}\) on the surfaces of two planets is \(5: 2\) and the ratio of their respective average densities \(\rho_{1}: \rho_{2}\) is \(2: 1\). What is the ratio of respective escape velocities \(v_{1}: v_{2}\) from the surface of the planets?

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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The velocity \((v)\) of a particle \((\) under a force \(F)\) depends on its distance \((x)\) from the origin \((\) with \(x>0) v \propto \frac{1}{\sqrt{x}} .\) Find how the magnitude of the force \((F)\) on the particle depends on \(x\)

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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In a triangle \(A B C\), the sides \(A B\) and \(A C\) are represented by the vectors \(3 \hat{i}+\hat{j}+\hat{k}\) and \(\hat{i}+2 \hat{j}+\hat{k}\) respectively. Calculate the angle \(\angle A B C\)

asked Dec 12, 2021 in Kinematics by kritika (90.1k points)

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