Answer:
planes, whereas the Oort cloud of comets has a spherical distribution.
Explanation:
A planet can be defined as a large celestial body having sufficient mass to allow for self-gravity and make it assume a nearly circular shape (hydrostatic equilibrium), revolves in an orbit around the Sun in the solar system and has a cleared neighborhood.
Basically, the planets are divided into two (2) main categories and these includes;
I. Outer planets: these planets are beyond the asteroid belt and comprises of jupiter, saturn, uranus and neptune, from left to right of the solar system.
II. Inner planets: these planets are the closest to the sun and comprises of mercury, venus, earth and mars.
These outer planets are made mostly of gases (hydrogen and helium) causing them to be less dense than the solid inner planets. These gases are generally known to be less dense in terms of physical properties.
Oort cloud is also referred to as Opik and it typically comprises of icy pieces of planetesimals (space debris) that spherically surrounds the sun at distances ranging from about 3000 to 100,000 AU.
Hence, the planets and the asteroid belt orbit the Sun in planes, whereas the Oort cloud of comets has a spherical distribution.
Answer:
900
Explanation:
v = s / t = 9000m / 10 s = 900m/s
Answer:
rainbow is regarded as one of the most spectacular light shows observed on the earth. A rainbow is a multicoloured arc made due to the striking of light on water droplets. Rainbow is produced after the rain, by reflection, refraction and light dispersion process in droplets of water. All such events develop a light spectrum in the sky are called rainbow.
The necessary conditions for the formation of the rainbow:
Presence of raindrops.
Sun should be at your back to observe the rainbow
Because of the dispersion, white light separates into different colors when entering the raindrop, causing less refraction of red light than blue light.
Formation of the rainbow:
Light rays, reach the drop near its top level. At first, there is refraction, then the dispersion of white light into colours of a different wavelength.
The violet is the most deviated and red is the least deviated colour.
Reaching the opposite side of the drop, each colour is refracted back into the drop due to the complete internal reflection that hits the drop surface.
Every colour is refracted to the air again.
We experience the rainbow when we observe in between 42-40 degrees.
The value of the angle of the incline
![\theta](https://tex.z-dn.net/?f=%5Ctheta)
at which the block starts to slide is the angle at which the component of the weight parallel to the incline becomes equal to the frictional force that keeps the block on the incline:
![mg \sin \theta = \mu N](https://tex.z-dn.net/?f=mg%20%5Csin%20%5Ctheta%20%3D%20%5Cmu%20N)
where the term on the left is the component of the weight parallel to the incline, and the term on the right is the frictional force, which is the product between the coefficient of friction
![\mu](https://tex.z-dn.net/?f=%5Cmu)
and the normal reaction of the incline N.
The normal reaction of the incline, N, is equal to the component of the weight perpendicular to the incline:
![N=mg \cos \theta](https://tex.z-dn.net/?f=N%3Dmg%20%5Ccos%20%5Ctheta)
Therefore, the initial equation becomes
![mg \sin \theta = \mu mg \cos \theta](https://tex.z-dn.net/?f=mg%20%5Csin%20%5Ctheta%20%3D%20%5Cmu%20mg%20%5Ccos%20%5Ctheta)
From which we find
![\tan \theta = \mu](https://tex.z-dn.net/?f=%5Ctan%20%5Ctheta%20%3D%20%5Cmu)
![\theta = \arctan \mu](https://tex.z-dn.net/?f=%5Ctheta%20%3D%20%5Carctan%20%5Cmu)
For angles above this value, the block will start sliding down, otherwise the block will stay on the incline.