Chapter 17 of 2363 min read

Power and vertical circular motion

Why this is asked: At the top of a vertical circle the minimum safe speed is √(gr), not zero — gravity alone supplies the whole centripetal force there, so tension or normal force drops to exactly zero, never negative.

This chapter is part of a paid pack

A sample of the book is free to read — the rest, including this chapter, unlocks with full access.

See pricing

Test yourself

•A bob of heavy mass $m$ is suspended by a light string of length $l$ . The bob is given a horizontal velocity $v_{0}$ as shown in the figure. If the string gets slack at some point P making an angle $θ$ from the horizontal, the ratio of the speed $v$ of the bob at point P to its initial speed $v_{0}$ is:
•At any instant of time $t$ , the displacement of a particle is given by $2 t - 1$ (SI units) under the influence of a force of 5 N. The value of the instantaneous power is (in SI units):

Open this in the full syllabus view · Physics

ShareWhatsApp Telegram