## Related questions with answers

(a) What is the ratio of the gravitational force that Earth exerts on the Sun in the winter and the force that exerts in the summer? (b) How many correct answers can you give for part (a)? (Hint: Earth's orbit is an ellipse with the Sun located at one of the foci of the ellipse. Think about the location of the observer on Earth.)

Solution

VerifiedFirst, let's suppose that our observer is in the northern Earth. We know that the axis of rotation of the Earth is making an angle of 23$\text{\textdegree}$ with the vertical, as you see in the figure below.

This angle is the cause of the seasons.

We know that the minimum distance between the Earth and the sun (during the Northen winter) is about

$R_{winter}=\color{#c34632}146\times 10^6$ km

And the maximum distance between the Earth and the sun (during the Northen summer) is about

$R_{summer}=\color{#c34632}152\times 10^6$ km

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