Problem 7DQ
In the conical pendulum in Example 5.20 (Section 5.4), which of the forces do work on the bob while it is swinging?
Step-by-Step Solution:
Solution 7DQ Step 1: As the pendulum is swinging, the only forces acting on it are gravity and tension. Gravity acts downwards and tension is along the string. Step 2: We know that, work done is W = Fds----------------(1) Where ds is the infinitesimal displacement element along the displacement of the bob. The work done due to gravity is, W G F dG------------------(2) But gravity is acting downwards and the displacement is perpendicular to it. So, the dot product will be zero. Hence the work done is zero.
Step 3 of 3
