Three friends A, B and C start running around a circular stadium and complete a single round in 24, 36 and 30 seconds respectively.

Solution: 9 = 3 x 3 = 32 12 = 2 x 2 x 3 = 22 x 3 15 = 3 x 5 => LCM (9, 12, 15) = 22 x 32 x 5 = 180 => the bells will toll together...

Round Shoulders: ln this postural deformity the shoulders become round and sometimes they seem to be bent forward. The following exercises should be performed for the remedy of round shoulders deformity: Keep your...

θ = 100 π; t = 5 sec θ = 1/2 αt2 = 100 π = 1/2 α 25 α = 8π × 5 = 40 π rad/s = 20 rev/s α = 8π rad/s2 = 4 rev/s2 ω = 40π rad/s2...

Theta=wt+1/2alpha Tsq. By this we will get Theta=200. For first 10 and last 10 sec theta will be same therefore =400. And for 10 sec of middle is alpha ×100= 400. Total =400+400=800rad

(b) Required time  = L.C.M of 24, 36 and 48  = 144 seconds  = 2 minutes 24 seconds

(c) They will be together at the starting point after the L.C.M of 36, 48 and 42 L.C.M. of 36, 48, 42 = 1008 seconds

(c) After 5 minutes (before meeting), the top runner covers 2 rounds i.e., 400 m and the last runner covers 1 round i.e., 200 m. Top runner covers 800 m...

(a) Here, A and B are moving in opposite directions. So, Relative speed = 2 + 3 = 5 rounds/hour So, they cross each other 5 times in an hour...

Round shoulder is a postural deformity in which the shoulders become round and sometimes they seem to be bent forward.  Physical activities for round shoulder:  1. Sit on a chair, rest the...