Answer:
refraction
Explanation:
When waves, including light, pass through two media with different densities, the waves bend at the transition between the two media due to differences in speed and wavelength. Convex lenses bend (refract) light and concentrate it at one point called the focal point.
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Then the the speed of the molecules also increase
electricity can't flow anymore if the wire isnt connected at the beginning
Answer:7.92 N
Explanation:
Given
mass of book 
coefficient of static friction 
coefficient of kinetic friction 
To move the book, one need to overcome the static friction
Static friction 



After overcoming the Static friction , Force needed to move the block is


