Answer: The inner core is solid, the outer core is liquid, and the mantle is solid/plastic. This is due to the relative melting points of the different layers (nickel–iron core, silicate crust and mantle) and the increase in temperature and pressure as depth increases.
Explanation: I just did a quiz with this question
Answer:
This happens in two ways. If an object is at rest and an unbalanced force pushes or pulls the object, it will move. Unbalanced forces can also change the speed or direction of an object that is already in motion.
Explanation:
Answer: 0.435 m
Explanation:
Given
mass m=20 kg
initial speed u=2 m/s
coefficient of kinetic friction ![\mu_k=0.3](https://tex.z-dn.net/?f=%5Cmu_k%3D0.3)
deceleration which opposes the motion is given by
![\Rightarrow a=g\sin \theta+\mu_kg\cos \theta\\\Rightarrow a=g(\sin \theta +\mu_k\cos \theta)](https://tex.z-dn.net/?f=%5CRightarrow%20a%3Dg%5Csin%20%5Ctheta%2B%5Cmu_kg%5Ccos%20%5Ctheta%5C%5C%5CRightarrow%20a%3Dg%28%5Csin%20%5Ctheta%20%2B%5Cmu_k%5Ccos%20%5Ctheta%29)
![\Rightarrow a=9.8(\sin 10^{\circ}+0.3\times \cos 10^{\circ})\\\Rightarrow a=4.59\ m/s^2](https://tex.z-dn.net/?f=%5CRightarrow%20a%3D9.8%28%5Csin%2010%5E%7B%5Ccirc%7D%2B0.3%5Ctimes%20%5Ccos%2010%5E%7B%5Ccirc%7D%29%5C%5C%5CRightarrow%20a%3D4.59%5C%20m%2Fs%5E2)
using ![v^2-u^2=2as](https://tex.z-dn.net/?f=v%5E2-u%5E2%3D2as)
![\Rightarrow s=\dfrac{2^2}{2\times 4.59}=0.435\ m](https://tex.z-dn.net/?f=%5CRightarrow%20s%3D%5Cdfrac%7B2%5E2%7D%7B2%5Ctimes%204.59%7D%3D0.435%5C%20m)
Explanation:
In di electric medium
The force is
So the force on air is decreased k times
Option C is correct