When a Craton is exposed at earth's surface, it is called a continental shield. Continental shield is any of the large stable areas of low relief in the Earth's crust that are composed of Precambrian Crystalline rocks. Shield areas are regarded as continental nuclei, the observation often being made that most continental shields are bordered by belts of folded rocks of post-Precambrian age.
Answer:
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Explanation:
M1(mass of wood) = 4 kg
M2(mass of water) = 3 kg
V1(volume of wood) = 2 * V2(volume of water )
Density = mass/volume ======= volume = mass/density
Density of water is 1 kg/m3
V2 = M2/density of water
V2 = 3 kg/m3/1kg/m3
V2 = 3 m3
V1(volume of wood) = 2 * V2
V1 = 2 * 3m3
V1 = 6m3
Density of wood = M1 ( mass of wood)/ V1(volume of wood)
Density of wood = 4 kg/ 6m3 = 2/3 kg/m3
Answer:
The length of the rope is 1.005 m.
Explanation:
Given that,
Length of rope = 2.0 m
Angular speed = 0.20 rev/s
Linear speed = 5.0 m/s
Since there are no external torques about the rotation axis
We need to calculate the length of the rope
Using conservation of angular momentum
![mr_{1}^2\times\omega_{1}=mr_{2}^2\times\omega_{2}](https://tex.z-dn.net/?f=mr_%7B1%7D%5E2%5Ctimes%5Comega_%7B1%7D%3Dmr_%7B2%7D%5E2%5Ctimes%5Comega_%7B2%7D)
![r_{1}^2\times\omega_{1}=r_{2}^2\times\dfrac{v_{2}}{r_{2}}](https://tex.z-dn.net/?f=r_%7B1%7D%5E2%5Ctimes%5Comega_%7B1%7D%3Dr_%7B2%7D%5E2%5Ctimes%5Cdfrac%7Bv_%7B2%7D%7D%7Br_%7B2%7D%7D)
![r_{2}=\dfrac{r_{1}^2\times\omega_{1}}{v_{2}}](https://tex.z-dn.net/?f=r_%7B2%7D%3D%5Cdfrac%7Br_%7B1%7D%5E2%5Ctimes%5Comega_%7B1%7D%7D%7Bv_%7B2%7D%7D)
Put the value into the formula
![r_{2}=\dfrac{2.0^2\times0.20\times2\pi}{5.0}](https://tex.z-dn.net/?f=r_%7B2%7D%3D%5Cdfrac%7B2.0%5E2%5Ctimes0.20%5Ctimes2%5Cpi%7D%7B5.0%7D)
![r_{2}=1.005\ m](https://tex.z-dn.net/?f=r_%7B2%7D%3D1.005%5C%20m)
Hence, The length of the rope is 1.005 m.