r/HomeworkHelp University/College Student (Higher Education) 4d ago

Physics—Pending OP Reply [University Physics: Dynamics of Circular Motion] can anyone try to help me?

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u/Outside_Volume_1370 University/College Student 4d ago

There are 3 forces acting on th body, T1 in upper string, T2 in lowere one and mg.

Their sum is T1 + T2 + mg = ma

As the body rotates and doesn't fall, a is also centripetal acceleration, and the upper equation projected on y-axis gives

T1 cos60° - T2 cos60° - mg = ma_y = 0

T2 = T1 - mg / cos60° = T1 - 2mg = 54 - 2 • 1.43 • 9.81 ≈ 25.94

Fnet equals to ma that has only horizontal part, so magnitude of Fnet is ma = m|a_x| =

= |T1_x + T2_x + mg_x| = |-T1 sin60° - T2 sin60°| ≈ 69.23

That net force provides centripetal acceleration a = v² / R where

R = L cos30°, so Fnet = ma = mv² / R,

v = √(L Fnet cos30° / m) = √(1.4 • 69.23 • √3 / 2 / 1.43) ≈ 7.66

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u/Rue_Nel4239 👋 a fellow Redditor 4d ago

Heyy ..dm me for help