To determine the distance at which Earth should be placed in the model, we can compare the distances of Mercury and Earth from the Sun.
- Mercury is approximately 60,000,000 km from the Sun and is represented by 10 cm in the model.
- Earth is approximately 150,000,000 km from the Sun.
We can set up a ratio to find out where Earth should be placed:
Distance for Mercury = 10 cm Distance for Earth = \( \frac{150,000,000 \text{ km}}{60,000,000 \text{ km}} \times 10 \text{ cm} \)
Calculating the ratio gives us: \[ \frac{150,000,000}{60,000,000} = 2.5 \] Thus, the distance for Earth would be: \[ 2.5 \times 10 \text{ cm} = 25 \text{ cm} \]
Therefore, Earth should be placed at 25 cm from the dot in the model. The correct response is:
25 cm.