# Physics

posted by .

(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 being pulled across a frictionless surface. Box A has a mass of 2 kg, box B has a mass of 4 kg and box C has a mass of 4 kg. The strings are labelled P, Q and R respectively.

The force of tension for string P is 250 N. I have to find the force of tension for strings Q and R.
---
On a system diagram of the entire system, I already found the acceleration (a = F/m = (250/10) = 25 m/s^2). This acceleration is the same for the whole system, right? But I don't know how to find the forces of tension for strings Q and R.
Any help?
Thanks.

• Physics -

Yes, the acceleration is for all of them.

The tension on each string is the mass following that string times the acceleration.

• Physics -

Then for FTQ (force of tension of string Q):
F=ma
=(8)(25)
=200 m/s^2

FTR
F=ma
=(4)(25)
=100 m/s^2
??

## Respond to this Question

 First Name School Subject Your Answer

## Similar Questions

1. ### physics

Two boxes (b1 = 23 kg and b2 = 57 kg) are being pushed across a horizontal frictionless surface, as the drawing shows. The 48-N pushing force is horizontal and is applied to the 23-kg box, which in turn pushes against the 57-kg box. …
2. ### Physics

The diagram for this problem is a pulley. On the left end Box 1 is sitting on a table and Box 2 is attached sitting on top of Box 1 and is attached to the string for the pulley. The right side has the string attached to Box 3 which …
3. ### Physics

A box of mass 50.0 kg is connected to a second box with a mass of 54.0 kg. Both are sitting on a horizontal surface and the coefficient of kinetic friction between the surface and each box is 0.51. If the second box is pulled away …
4. ### physic

A box of mass 2 Kg lies on a rough horizontal floor with the coefficient of friction between the floor and the box being 0.5 (Figure 3). A light string is attached to the box in order to pull the box across the floor. If the tension …
5. ### fizk

3 - A box of mass 2 Kg lies on a rough horizontal floor with the coefficient of friction between the floor and the box being 0.5 (Figure 3). A light string is attached to the box in order to pull the box across the floor. If the tension …
6. ### Physics

The drawing shows two boxes resting on frictionless ramps. One box is relatively light and sits on a steep ramp. The other box is heavier and rests on a ramp that is less steep. The boxes are released from rest at A and allowed to …
7. ### Science last question

Which of the following boxes would have the strongest gravitational pull on a third object positioned at an equal distance from both boxes?
8. ### Physics

Consider the box being pulled across the horizontal surface again. If the box has a mass of 10kg, the coefficient of friction is 0.25,the distance that the box is pulled is 5m, the force is 150N and the angle is 30 degrees, ehat was …
9. ### Physics

The box is being pulled by a roope across a level floor as shown in the diagram. The box is accelerating at 1 m/s2, the coefficient of kinetic friction is 0.5. what is th tension in the rope?
10. ### Physics

The A box is being pulled by a rope across a level floor as shown in the diagram. The box is accelerating at 1 m/s2, the coefficient of kinetic friction is 0.5. What is the tension in the rope?

More Similar Questions