Answer :
Final answer:
The apparent angle of contact when the capillary tube is depressed so that the top is only 1 cm above is greater than zero. This is due to the altered adhesive and cohesive forces between the liquid and the tube surface. The exact angle depends on the fluid properties, which aren't given.
Explanation:
In this situation where the question asks about the apparent angle of contact when the capillary tube is depressed further, we can use the capillary action principle governed by the formula 2T cos θ h = rpg, where h is the height of the liquid inside the capillary tube relative to the outside, T is the surface tension of the liquid, θ is the contact angle between the tube and the liquid, r is the tube's radius, p is the liquid's density, and g is the acceleration due to gravity. In the initial position, we have a zero-degree contact angle which corresponds to the case of a liquid like water rising in a glass tube, as it is strongly attracted to the tube's material. When the tube is further depressed, the liquid level inside the tube would decrease due to capillary pressure. The apparent angle θ is now greater than zero, which would reflect the altered strength of adhesive and cohesive forces as the tube is depressed. However, without knowing more about the fluid properties, it is not possible to calculate the exact angle our example would produce.
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