Question

A balance and torque experiment is conducted with a balanced ruler (that is, the pivot point is in the middle).

Length of the ruler: 1 m

Mass of the ruler: 700 g

Weight 1: 1.3 N. This weight is placed at the 24-cm mark on the ruler.

Weight 2: 6 N. This weight is placed at the 54-cm mark on the ruler.

We want to balance the ruler by placing a weight at the 93-cm mark.

What should the magnitude of this weight?

A balance and torque experiment is conducted with a balanced ruler (that is, the pivot point is in the middle).

Length of the ruler: 1 m

Mass of the ruler: 650 g

Weight 1: 3 N. This weight is placed at the 9-cm mark on the ruler.

Weight 2: 4 N. This weight is placed at the 53-cm mark on the ruler.

We want to balance the ruler by supporting it with a spring scale at the 5-cm mark.

What reading should we expect on the spring scale?

Answer #1

A balance and torque experiment is conducted with a balanced
ruler (that is, the pivot point is in the middle).
Length of the ruler: 1 m
Mass of the ruler: 800 g
Two masses are placed on the ruler. You need to find where to
place the third mass to balance it.
Mass 1: 294 g. This mass is placed at the 23-cm mark on the
ruler.
Mass 2: 227 g. This mass is placed at the 69 cm mark...

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http://media.pearsoncmg.com/aw/aw_0media_physics/vtd/video46.html
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