Question

The mass of a box measured by a grocer's balance is 2.30 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. What is
(a) the total mass of the box
(b) the difference in masses of the gold pieces to correct significant figures.

Answer 1

Answer:

(a) 2.3 kg

(b) 0.02 g

Explanation:

Given:

Mass of the box (m) = 2.3 kg

Mass of one gold piece,m1= 20.15 g = 0.02015 kg

Mass of other gold piece, m2 = 20.17 g = 0.02017 kg

(a) Finding Total Mass = m + m1 + m2

= 2.3 + 0.02015 + 0.02017 = 2.34032 kg on rounding off total mass = 2.3 kg

(b) Difference in masses = m2– m1

= 20.17-20.15 = 0.02 g

(correct upto two places of decimal)

Answer 2

Given,

➡️Mass of the box = 2.3kg

➡️Mass of one

gold piece(m1) = 20.15g = 0.02015kg

➡️Mass of other

gold piece (m2)=20.17g=0.02017 kg

To Find:-

• Total mass of the Box

• The difference in masses Of the gold piece.

Calculations:-

Total mass:-

----->m + m1 + m2

------>2.3+0.02015+0.02017

------>2.34032kg

Differences in masses:-

----->m2-m1

----->20.17-20.15

------>0.02g

a)Total mass of the box is 2.34032kg.

b) Difference in masses is 0.02g.