Density=mass÷volume
density=40.5÷15=2.7
Answer:
Lightning can kill people or cause cardiac arrest. Injuries range from severe burns and permanent brain damage to memory loss and personality change.
Lightning happens when the negative charges (electrons) in the bottom of the cloud are attracted to the positive charges (protons) in the ground.
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Potential energy can be defined as the energy of something in relation to others, stresses within itself, or the electric charge.
Elastic potential energy the energy that is stored due to the deformation of an elastic object (i.e. a spring). This energy is equal to the energy needed to stretch the spring.
Chemical potential energy is energy stored in a substance's chemical bonds. This energy can be absorbed/released during either a chemical reaction or a phase transition.