Final answer:
To find the total downward force exerted by the girl standing on one foot, multiply the given pressure by the area of her foot. The calculation is 6.5 N/cm² × 80 cm², resulting in a force of 520 N.
Step-by-step explanation:
The pressure exerted by a girl standing on one foot is given as 6.5 N/cm2. To calculate the total downward force, we need to use the formula for pressure (P) which is:
P = F/A
where:
- P is the pressure,
- F is the force, and
- A is the area over which the force is applied.
Rearranging the formula to solve for force gives us F = P × A. Given that the area (A) of her foot is 80 cm2, we can calculate the downward force as follows:
F = 6.5 N/cm2 × 80 cm2
This equates to:
F = 520 N
Therefore, the girl exerts a total downward force of 520 Newtons.