# Physics

When a mass of 50g is hung from 5cm mark of a uniform meter rule. The rule balance on a knife edge placed at the 35cm mark . what is the weight of d meter rule? (take g:10ms-2).

1. 👍
2. 👎
3. 👁
1. the 50 g mass is 30 cm from the balance point

the center of mass of the meter rule is 15 cm from the balance point
... half the distance ... twice the mass

the mass of the rule is twice 50 g
... weight is ... m * g ... .05 kg * 10 m/s^2 = .5 N

1. 👍
2. 👎
2. oops ... forgot to double the 50 g

weight of the rule is ... 1 N

1. 👍
2. 👎
3. moments in grams * centimeters about 0 cm mark
clockwise: 50 * 5 + m * 50
counterclockwise: (m+50) * 35
so
250 + 50 m = 35 m + 1750
15 m = 1500
m = 100 grams which is 0.100 kilograms
weight = mass * g = 0.100 kg * 10 meters /second^2 = 1 Newton

1. 👍
2. 👎

## Similar Questions

1. ### Physics

A uniform half metre rule is freely pivoted at the 15cm Mark and it balanced horizontally when a body of mass 40g is hung from the 2cm Mark. calculate the mass of the rule

2. ### Physics

A uniform meter stick balances on a fulcrum placed at the 40 cm mark when a weight W is placed at 30 cm mark. What is the weight of the meter stick? How to calculator it ?

3. ### Physics

A uniform metre rule AB us balanced on a knife edge which is 55cm from B. If a mass of 10g is hung at P, which is 10cm from A, calculate the mass of the metre rule. Please HELLLLP

4. ### Science

A uniform half metre rule is balanced horizontally across a knife edge placed 20cm from A. A mass of 22.5g is hung from end A. 1. What is the mass of the rule 2. What is the force exerted on the rule by the knife edge?

1. ### Physics

A uniform meter stick balances on a fulcrum placed at the 40 cm mark when a weight W is placed at 30 cm mark. What is the weight of the meter stick? How to calculator it ?

2. ### Physics

a uniform metre rule pivoted at R, the 70cm mark. Two forces 0.1 N and 0.4 N are applied at Q, the 60cm mark and S, the 85cm mark. If the metre rule us kept in equilibrium, by the forces, calculate the weight of the metre rule.

3. ### Science

A uniform meter scale is suspended from 40 cm mark when weight of 25 gf and 10 gf are suspended at 5 cm mark and 75cm mark respectively. Calculate the weight of the meter scale.

4. ### Physics

A uniform meter stick with a mass of 210 g is supported horizontally by two vertical strings, one at the 0 cm mark and the other at the 90 cm mark (Fig. 9-57). (a) What is the tension in the string at 0 cm? (b) What is the tension

1. ### Science

A uniform have metre rule,pivoted at 20cm mark balances horizontally when a mass of 50g is suspended from 4cm mark calculate the mass of the metre rule.

2. ### physics

a uniform half metre rule is freely pivoted at the 20 cm mark and its balance horizontaly when a body of mass 30g is hung 5cm mark from end calculate the mass of rule

3. ### Physics

A uniform meter rule of mass 100g balance at a 40cm mark when a mass x is placed at the 10cm mark.What is x?

4. ### Physics

A metre rule is found to be balanced at 48 cm mark when body of mass 60g is suspended at the 6cm mark , the balance point is found to be at 30cm mark.calculate the metre rule the distance of the balance point from the zero end if