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Is that possible to form two shadows of the same object?

Yes, it is possible for an object to cast several shadows. One example, is that of a footballer on a floodlit pitch. If he is in the central region of the field, you will usually see four shadows: one from each of the corner floodlights.


Will petroleum sources of energy ever come to an end?

Yes, petroleum sources of energy are finite and will eventually run out. However, estimates of when this will happen vary. As renewable energy sources become more prevalent and technology advances, the need for petroleum may decrease.


Can evaporation happen without heat?

Yes, evaporation can happen without heat. Evaporation occurs when molecules gain enough energy to escape the surface of a liquid and become a gas. This energy can come from sources other than heat, such as wind or low pressure.


How can a system have more than one resonant frequency?

A system can have more than one resonant frequency if it has multiple modes of vibration that can be excited. Each mode will have its own natural frequency at which it resonates. This can happen in systems with complex geometries or multiple components interacting with each other.


How can multiple objects have a net momentum of zero?

Multiple objects can have a net momentum of zero if their individual momenta cancel each other out. This can happen when objects are moving in opposite directions or when the magnitudes of their momenta are equal but opposite. In this scenario, the total momentum of all the objects in the system sums to zero.