Why a horse can not pull a cart and run in empty space?

A horse cannot pull a cart and run in empty space.Why?

There are different type of forces in nature.We learnt their effects and applications.Give the exact reasons for the following. Why can't a horse pull a cart in empty space?

A toroid has a core (non-ferromagnetic) of inner radius 25 cm and outer radius 26 cm, around which 3500 turns of a wire are wound. If the current in the wire is 11 A. What is the magnetic field a. outside the toroid b. inside the core of the toroid, and c. in the empty space surrounded by the toroid.

A rat and a horse are to be projected from earth into space. State whether the velocity is the same or different in projecting each animal. Justify.

The density of solid argon is 1.65 g/mL at -233^(@)C . If the argon atom is assumed to be sphere of radius 1.54xx10^(-8) cm, what percentage of solid argon is apparently empty space? (Ar = 40)

Why transverse waves can not setup in gas?

A horse pulls a cart with constant force so that the cart moves with a constant speed. Will the speed of the cart increase,decrease or remain the same if the horse applied more force?