Homework Help: Physics

Posted by Kate on Sunday, February 28, 2010 at 4:46pm.

Three blocks of masses 1.0, 2.0, and 4.0 kilograms are connected by massless strings, one of which passes over a frictionless pulley of negligible mass, as shown above. Calculate each of the following.

a. The acceleration of the 4 kilogram block

b. The tension in the string supporting the 4 kilogram block

c. The tension in the string connected to the l kilogram block

This is an atwood's machine were on the left side there is the 2.0 kg block and the 1.0 kg block

on the right side is the 4.0 kg block

can you tell me if my answers are correct

a 2.5 m/s^2

b 39 N

Thanks

Physics - Kate, Sunday, February 28, 2010 at 4:47pm
Is C just 9.8 N
Physics - Kate, Sunday, February 28, 2010 at 4:49pm
wait no 12 N
Physics - bobpursley, Sunday, February 28, 2010 at 5:59pm
No. The net accelelerating force is (4-1-2)g

acceleration= netforce/total mass= g/(7)

How did you get double that in a)?
b)tension= 4(g-acceleration in a)
c) I am not certain where the 1 kg block is. If it is on the bottom of the left side, tension= 1g+accelearation in a)
Physics - nitesh, Wednesday, September 22, 2010 at 10:30pm
acceleration = 1.4 m/s/s
tension of 4kg block is= 33.6 N
tension of 1kg block is= 11.2 N

Answer this Question

Related Questions

physics - Three blocks of masses M1=26kg,M2=38kg and M3=41kg are connected by 2 ...
physics - Three blocks are located on a horizontal table. The coefficient of ...
physics - Three blocks are located on a horizontal table. The coefficient of ...
physics - Two blocks with masses M1 = 3.9 kg and M2 = 5.0 kg are connected with ...
Physics - A massless rope passes over a massless, frictionless pulley. One end ...
Physics - The two blocks in the figure are connected by a massless rope that ...
physics - The drawing shows box 1 resting on a table, with box 2 resting on top ...
Physics - Three identical blocks, A, B, and C, are on a horizontal frictionless ...
Physics - The diagram for this problem is a pulley. On the left end Box 1 is ...
Physics - Three blocks are located on a horizontal frictionless table. They are ...

For Further Reading

First Name:
School Subject:
Answer: