The scale reading of Bob standing on a scale on the surface of earth is 784 N.
How to calculate the reading on the scale?
The scale read in each situation if you account for the gravitational force of all objects in the pictures.
The reading is equal to the weight of Bob which is the gravitational pull on the Bob.
The weight of Bob on the scale is calculated as follows;
W = mg
where;
- m is the mass of Bob
- g is acceleration due to gravity
W = 80 kg x 9.8 m/s²
W = 784 N
Thus, the scale reading is determined as 784 N.