Answer:
Reflection involves a change in direction of waves when they bounce off a barrier. Refraction of waves involves a change in the direction of waves as they pass from one medium to another.
The resultant force is 5N.So the box moves to right with constant acceleration.
The hotter star will be 16 times more luminous - luminosity depends on two things - the size of the star and the temperature of the star. The hotter a star is, the more energy it will give out. This will give rise to greater luminosity.
Explanation:
that's impossible,the radius of the earth can't decrease when the mass doubles!
Answer:
False
Explanation:
that is cohesion. adhesion is force between dissimilar molecules of a body
