AP EAMCET201822 Apr 2018Morning ShiftPhysicsGravitationActual
Three masses m, 2 m and 3 m are arranged in two triangular configurations as shown in figure 1 and figure 2 . Work done by an external agent in changing, the configuration from figure 1 to figure 2 is
Options
- A6 G m^2 a [2- 6 2 ]
- B0
- CG m^2 a [6+ 6 2 ]
- D- G m^2 a [6- 6 2 ]
Correct answer
D. - G m^2 a [6- 6 2 ]
Step-by-step solution
Work done to change configuration from 1 to 2 can be calculated by W₁₂=- (U_f-U_i ) aligned & =- [- G m^2 a (2+3+ 6 2 )- (- G m^2 a (2+3+6) ) ] & =- G m^2 a (6- 6 2 ) aligned