Question

The arms of a physical balance are equal but an object weighs 7.00 kg when placed in the left pan and 7.50 kg placed in the right pan. What is the actual mass of the object ?

• A. 7.00 kg
• B. 7.25 kg
• C. 7.50 kg
• D. 7.15 kg

Answer 1

Answer: (B)

7.25 kg

Answer 2

M = $\frac { \mathrm { M } _ { 1 } + \mathrm { M } _ { 2 } } { 2 }$

M = $\frac { 7.00 + 7.50 } { 2 }$ = 7.25 kg.