A sphere of mass m is tied to end of a string of length l and rotated through the other end along a horizontal circular path with speed v. The work done in full horizontal circle is

Question

A sphere of mass m is tied to end of a string of length l and rotated through the other end along a horizontal circular path with speed v. The work done in full horizontal circle is (A) zero (B)  ( (mv2/l) )2π l  (C)  mg. 2π l  (D)  ( (mv2/l) )(l)

Tardigrade Admin · Accepted Answer

Work done by centripetal force in uniform circular motion is always equal to zero.

Q. A sphere of mass m is tied to end of a string of length $l$ and rotated through the other end along a horizontal circular path with speed v. The work done in full horizontal circle is

zero

$(\frac{m v ^{2}}{l}) 2 π l$

$m g . 2 π l$

$(\frac{m v ^{2}}{l}) (l)$

Work done by centripetal force in uniform circular motion is always equal to zero.

Q. A sphere of mass m is tied to end of a string of length l and rotated through the other end along a horizontal circular path with speed v. The work done in full horizontal circle is

zero

(lmv2​)2πl

mg.2πl

(lmv2​)(l)

Work done by centripetal force in uniform circular motion is always equal to zero.

Q. A sphere of mass m is tied to end of a string of length $l$ and rotated through the other end along a horizontal circular path with speed v. The work done in full horizontal circle is

$(\frac{m v ^{2}}{l}) 2 π l$

$m g . 2 π l$

$(\frac{m v ^{2}}{l}) (l)$