To find the weight of a person, you can use the formula:
\[ \text{Weight} = \text{mass} \times \text{gravitational acceleration} \]
Given that the mass of the man is 90 kg and the acceleration due to gravity on Earth (g) is 9.82 m/s², you can calculate the weight as follows:
\[ \text{Weight} = 90 , \text{kg} \times 9.82 , \text{m/s}^2 = 883.8 , \text{N} \]
Therefore, the weight of the 90 kg man standing on Earth is approximately 883.8 Newtons.