# physics 2, help please

Two masses (mA= 2 kg, mB= 4 kg) are attached to a (massless) meter stick, at the 0 and 75 cm marks, respectively.

c.) Now, if mass B was removed, how much force would need to be exerted at the 100 cm mark in order to keep the meter stick level*?
? N

d.) Now, if mass B was removed, and no additional force was supplied, calculate the size of the angular acceleration of the meter stick at that instant*.
? rad/s2

1. 👍 0
2. 👎 0
3. 👁 165
asked by kelsey
1. There has to be a center of rotation it seems to me, and it is not specified.

1. 👍 0
2. 👎 0
2. I think the assumption is to assume that the stick is level with masses A and B attached.
Thus if the balance point is x cm from the zero
2x=4(75-x) so x=50 cm

Assuming this then to keep it level
2 kg are needed at 100 cm.
If g=10 m s^-2 then the force is 20 N.

Not a very well worded question in my view.

1. 👍 0
2. 👎 0
posted by Dr Russ

## Similar Questions

1. ### Physics

A meter stick weighs 200 grams and is supported at the center. Three masses of 100, 200, and 150 grams are placed respectively, at the 10-cm, 20-cm and 60 cm points of the meter stick. To balance the meter stick, where must a 300

asked by Lily on September 28, 2014
2. ### physics

A .100 kg meter stick is supported at its 40.0 cm mark by a string attached to the ceiling. A .700 kg mass hangs vertically from the 5.00 cm mark. A mass, m, is attached somewhere on the meter stick to keep it horizontal and in

asked by Anonymous on December 4, 2007
3. ### Physics-Torques

Suppose you have a meter stick with two masses attached. The mass m1 is 0.60 kg and it is located at x1 = 30 cm from the left (zero) end of the meter stick. The pivot point is located at x = 45 cm. The mass of the meter stick (mms

asked by Nicole on March 20, 2007
4. ### physics

A meter stick is pivoted at its 50-cm mark but does not balance because of non-uniformities in its material that cause its center of gravity to be displaced from its geometrical center. However, when masses of 150 and 200 grams

asked by jess on June 25, 2010
5. ### College Physics

A uniform meter stick of mass M has an empty paint can of mass m hanging from one end. The meter stick and the can balance at a point 19.9 cm from the end of the stick where the can is attached. When the balanced stick-can system

asked by Mimi on April 27, 2013
6. ### physics

A 65 g meter stick has two masses, each 250 g placed upon it. The first is located at 72 cm and the second located at 41 cm. Where should you place your finger if you wished to balance the meter stick? Give your answer in cm.

asked by paige on April 25, 2011
7. ### Physics

A meter stick is positioned on a horizontal table top such that the 100cm end extends over the edge of the table. A 200 g mass is produced on the 85 cm mark of the meter stick. When the 70 cm mark of the meter stick is on the edge

asked by Stella on December 9, 2018
8. ### Physics 1

A meter stick has a mass of 200g and its center of gravity is at the 50.0 cm mark. If 150g is attached to the stick at the 10 cm mark, where would an upward force on the stick need to be placed to balance the stick and the added

asked by Lindsey on March 9, 2011
9. ### physics

if the fulcrum of a .15 kg meter stick was placed at 25 cm and a 300 g mass at the 5 cm mark, would it be possible to balance the meter stick with a 100 g mass on the long side of the meter stick? what would the position of the

asked by HELP!!!! on March 31, 2011
10. ### physics

if the fulcrum of a .15 kg meter stick was placed at 25 cm and a 300 g mass at the 5 cm mark, would it be possible to balance the meter stick with a 100 g mass on the long side of the meter stick? what would the position of the

asked by Torques, equilibrium and center of mass on March 31, 2011

More Similar Questions