Thursday

March 26, 2015

March 26, 2015

Posted by **Chelsea** on Tuesday, June 21, 2011 at 7:53pm.

The figure has block B on a table and to the right there is a knot in the string from which block A hangs. A 30 degree angle is made from the knot to a wall on the right.

I'm taking physics as a 5 week summer course and we just learned forces and motion today. However, I am really confused and none of the example problems in the notes are like this... I would appreciate it if someone could explain this to me.

- Physics -
**Lawrence**, Wednesday, February 1, 2012 at 2:55pmSince we know that block B is on the verge of sliding, the maximum weight that can he held is 716N*0.31= 221.96 N. And since the knot is not moving, (no acceleration, that means the force of 221.96N is also the same for the rope from the knot to the wall. And with a little trigonometry, you can solve for force on A, which is 221.96* tan (30) = opposed side which is the force on A, so that means A must equal 128.15N

**Answer this Question**

**Related Questions**

physics - Block B weighs 708 N. The coefficient of static friction between block...

Physics - Block B in the figure below weighs 713 N. The coefficient of static ...

Physics - A block of mass m1 is on top of a block of mass m2. Block 2 is ...

@ elena - In the figure the coefficient of static friction between mass (MA) ...

Physics - A 0.5 kg wooden block is placed on top of a 1.0 kg wooden block. The ...

Physics - A 5.00-kg block is placed on top of a 12.0-kg block that rests on a ...

Physics - Block A in the figure weighs 48.0N . The coefficient of static ...

Physics - A 6.99-kg block is placed on top of a 12.9-kg block that rests on a ...

physics - A 4.85-kg block is placed on top of a 12.0-kg block that rests on a ...

Physics/Math - A 17 N horizontal force F pushes a block weighing 6.0 N against a...