Question

WORK POWER ENERGY
07. The maximum and minimum tensions in the
string used to rotate a body in a vertical circle
are in the ratio 19:1. The ratio of maximum to
minimum speeds of the body are
2) 19:13) 4:1 4) 5:1
172:1 2) 119:1​

Answer 1

Answer:

HELLO GUYS HERE IS YOUR ANSWER

Explanation:

ANSWER

Let v1 and v2 be the velocities at the lowest and the highest points.

∴v2v1=13

Conserving energy between the lowest and highest points gives

v12=v22+2gh

⇒3v22=v22+2gh

⇒v22=gh

⇒v12=3gh

h is distance between the lowest and the highest points which is 2r.

h=2r

Tensions at the lowest and highest point

T1=

HOPEFULLY IT'S HELPFUL FOR YOU

THANKS. ..

Answer 2

Explanation:

since centripetal force + /- weight in net Tension , it shall be lowest at Peak and lowest at Bottom

CP = mV^2/r

CP + mg

_____________. = 19/1

CP-mg

20 mg = 18 m v^2/R

v^2= 5/4×R

v = Root ( 5/4 R)