Geostationary satellite.
Answer:-
A geostationary satellite is so named because it appears to remain stationary over the same place on earth because the time period of revolution of geostationary satellite is same as that of earth.
angle of contact.
It is defined as the angle between the tangent to the liquid surface at the point of contact and solid surface inside the liquid is called as angle of contact The value of angle of contact depends upon (i) Nature of solid and liquid in contact (ii) Cleanliness of the surface in contact (iii) Medium above the free surface of liquid
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