Friday

March 6, 2015

March 6, 2015

Posted by **Stephanie** on Friday, April 22, 2011 at 12:54am.

- Physics -
**drwls**, Friday, April 22, 2011 at 6:27amLet x be the distance (in feet) of the balance point from the end with the 30 lb weight.

The total moment about the balance point must be zero, if the beam is balanced. The beam's weight acts through the center of mass and exerts a moment of (3-x)*20 ft-lb about the pivot point.

This equals the moment (of opposite sign) due to the added weight, which is 30*x. The center of mass and the added weight are on opposite sides of the balance point.

Solve (3-x)*20 = 30x

60 - 20x = 30x

60 = 50x

x = ___

- Physics -
**lemuel**, Thursday, May 22, 2014 at 9:39pm1.2

**Answer this Question**

**Related Questions**

Physics - A 30-lb weight is attached to one end of a 6-ft uniform beam whose own...

Physics - A uniform steel beam of length 5.50 m has a weight of 4.50 103 N. One ...

Physics - A uniform steel beam of length 5.50 m has a weight of 4.50 103 N. One ...

physics - A uniform, horizontal beam is 5.00m long and has a weight of 200N. The...

maths - 2. A bar of uniform section is 81.4cm long and weighs 4.45 kg. A weight ...

Physics - A uniform steel beam of length 5.50 m has a weight of 4.50 103 N. One ...

Physics - A uniform rod of weight 5N and lenght 1m is pivoted at a point of 20 ...

Physics - A vertical spring has one end attached to the ceiling and a 2.50 kg ...

physics - a uniform meter stick is balanced at its midpoint with a single ...

Physics - A uniform beam of length L = 7.80 m and weight 4.05 102 N is carried ...