The movement of material due to differences in density that are caused by differences in temperatures is called CONVECTION.
The prokaryotic cells are indeed smaller than the eularyotic cells.
Eukaruotic cell size -10-100um
Prokaryotic cell size - 1-10 um
The answer is downwards because the ball is pulling down the spring due to its weight
In an elastic collision momentum is conserved as well as the kinetic energy
Explanation:
In physics, there are two types of collisions:
- Elastic collision: in an elastic collision, the total momentum of the system is conserved, and the total kinetic energy of the system is conserved as well. This is because there are no internal frictions acting on the system, so the energy is conserved. An example of elastic collision is (approximately) that occurring between two billiard balls.
- Inelastic collision: in an inelastic collision, the total momentum of the system is conserved, while the total kinetic energy is not. In fact, due to the presence of internal frictions, part of the total energy is converted into thermal energy and sound during the collision, and therefore "wasted", so the final total kinetic energy is less than the initial one. An example of inelastic collision is the collision between two cars. The maximum amount of kinetic energy is lost when the two objects stick together after the collision; in this case, we talk about perfectly inelastic collision.
Therefore, the complete sentence is
In an elastic collision momentum is conserved as well as the kinetic energy
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We can solve the problem by using the mirror equation:
where
f is the focal length
is the distance of the object from the mirror
is the distance of the image from the mirror
For the sign convention, the focal length is taken as negative for a convex mirror:
and the image is behind the mirror, so virtual, therefore its sign is negative as well:
putting the numbers in the mirror equation, we find the distance of the object from the mirror surface:
So, the distance of the object from the mirror is
