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Physics · SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

हिन्दी

In the system shown in Figure, a uniform bar AB of length 70 cm and weight \( W \) is supported on knife edges \( K_1 \) and \( K_2 \) located at 10 cm from ends A and B respectively. A load \( W_1 \) is suspended at P, 30 cm from end A. If the reactions at \( K_1 \) and \( K_2 \) are denoted as \( R_1 \) and \( R_2 \), taking the moments about the centre of gravity G of the bar yields which of the following equilibrium conditions?

  1. \( R_1(K_1G) - W_1(PG) - R_2(K_2G) = 0 \)
  2. \( R_1(K_1G) + W_1(PG) - R_2(K_2G) = 0 \)
  3. \( -R_1(K_1G) - W_1(PG) + R_2(K_2G) = 0 \)
  4. \( -R_1(K_1G) + W_1(PG) + R_2(K_2G) = 0 \)

Correct answer · Option 4

\( -R_1(K_1G) + W_1(PG) + R_2(K_2G) = 0 \)

Explanation

Taking moments about G: \( R_1 \) produces a clockwise (negative) moment, while \( W_1 \) and \( R_2 \) produce anticlockwise (positive) moments, giving \( -R_1(K_1G) + W_1(PG) + R_2(K_2G) = 0 \).

Related questions

Given below are two statements: Statement I: The kinetic energy of a body of moment of inertia \( I \) rotating with an angular velocity \( \omega \) about a fixed axis is given by \( K = \frac{1}{2} I \omega^2 \). Statement II: The moment of inertia of a rotating rigid body changes if its angular velocity is doubled. In the light of the above statements, choose the most appropriate answer from the options given below:→Given two vectors \( \mathbf{a} = 3\hat{i} - 4\hat{j} + 5\hat{k} \) and \( \mathbf{b} = -2\hat{i} + \hat{j} - 3\hat{k} \), the cross product \( \mathbf{a} \times \mathbf{b} \) is equal to:→Consider the following statements regarding rotational motion about a fixed axis: (A) Only those components of external torques that lie along the axis of rotation can cause the body to rotate about the axis. (B) Torques perpendicular to the fixed axis are balanced by the constraint forces exerted by the hinges/supports. (C) Forces parallel to the axis of rotation produce non-zero torque about that axis. (D) The rate of work done by an external torque \( \tau \) rotating a body with angular speed \( \omega \) is given by \( P = \tau \omega \). How many of the above statements are correct?→In an L-shaped uniform lamina formed by three identical squares of side length \( b = 2\text{ m} \) as oriented in Fig. 6.11 (with bottom-left square at origin having vertices from \( (0,0) \) to \( (2,2) \)), the coordinate of the centre of mass is:→
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