In this paper we address the question of solvability of dynamic equations on time scales in Banach spaces. In particular, our main theorem extends the result for classical differential equations in Banach spaces of Bana\'s and Goebel (1980), to an arbitrary time scale. Central role is played by the axiomatic theory of measures of noncompactness. Moreover, we study countable systems of dynamic equations on time scales arising from semi-discretisation of parabolic partial dynamic equations.
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