Physics

posted by .

A box of mass m2 = 3.1 kg rests on a frictionless horizontal shelf and is attached by strings to boxes of masses m1 = 1.6 kg and m3 = 2.6 kg as shown below. Both pulleys are frictionless and massless. The system is released from rest. After it is released, find the tension in each string

  • Physics -

    m1•a=T1-m1•g,
    m2•a=T3-T1,
    m3•a=m3•g – T3
    (m1+m2+m3) •a= T1-m1•g+ T3-T1+m3•g – T3= g• (m3-m1)

    a= g• (m3-m1)/ (m1+m2+m3) =9.8•(2.6-1.6)/(1.6+3.1+2.6)=1.34 m/s²
    T1=m1• (a+g) = 1.6•(1.34+9.8)=17.8 N
    T3 = m3• (g-a) = 2.6(9.8-1.34) = 22 N

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    (Apparently, I'm not allowed to post URLs, but this question is better illustrated by a diagram, i39. tinypic. com/ 17e336. jpg) <--P--[BOX A]<--Q--[BOX B]<--R--[BOX C] There are three boxes attached together with string and …
  2. Physics

    A ramp, a pulley, and two boxes. Box A, of mass 10.0 kg, rests on a surface inclined at 37° to the horizontal. It is connected by a lightweight cord, which passes over a massless and frictionless pulley, to a second box B, which hangs …
  3. physics

    The systems shown below are in equilibrium (with m = 3.60 kg and θ = 33.0°). If the spring scales are calibrated in newtons, what do they read?
  4. physics

    Two boxes of masses 21.6 kg and 28.2 kg sit on a smooth, frictionless surface. The boxes are in contact, and a horizontal force of 68.2 pushes horizontally against the smaller box. What is the acceleration of the two boxes?
  5. physics

    Three blocks are suspended at rest by the system of strings and frictionless pulleys shown in the figure below, where W = 29.0 . What are the weights w1 and w2?
  6. Physics

    The systems shown below are in equilibrium (with m = 4.80 kg and θ = 27.0°). If the spring scales are calibrated in newtons, what do they read?
  7. Physics

    3 objects with masses m1=5kg, m2=10kg and m3=15kg are attached by massless string over two frictionless pulleys. The horizontal surface is frictionless and system is released from rest. Using energy concept calculate m3 speed after …
  8. Physics

    Two boxes are connected by a light string that passes over a light, frictionless pulley. One box rests on a frictionless ramp that rises at 30° above the horizontal (see the Figure below), and the system is released from rest. (a) …
  9. Physics 2

    Two boxes are connected by a light string that passes over a light, frictionless pulley. One box rests on a frictionless ramp that rises at 30° above the horizontal (see the Figure below), and the system is released from rest. (a) …
  10. physics

    The system shown below are in equilibrium with m = 2.90 kg If the spring scales are calibrated in newtons, what do they read?

More Similar Questions