Answer:
There are a number of models as explained below.
Explanation:
- Depending on the position of the earth in the orbit, stars will be in different positions relative to the distant stars.
This model can be explained by the parallax effect. An object is viewed differently by the left and the right eye.
Reference can be made to the geocentric and heliocentric arguments. The first view argues that heavens are composed of 55 concentric spheres.
On the other hand, the heliocentric system, proposed by Copernicus, suggested that the Sun, not the earth, was the center of the solar system.
Answer:
From the given options, the option (D) is correct. Because Al is the aluminium which is located in period 3 of the periodic table.
Explanation:
We know that the 3rd period contains 8 elements which are as follows:
- sodium
- magnesium
- aluminium
- silicon
- phosphorus
- sulfur
- chlorine, and
- argon
The sodium and magnesium, the first 2 elements, are members of the s-block of the periodic table, while the rest of the members are the elements of the p-block.
Thus, from the given options, the option (D) is correct. Because Al is the aluminium which is located in period 3 of the periodic table.
Answer:
![g'=10.78\ m/s^2](https://tex.z-dn.net/?f=g%27%3D10.78%5C%20m%2Fs%5E2)
Explanation:
The time period of a simple pendulum is given by :
![T=2\pi \sqrt{\dfrac{L}{g}}](https://tex.z-dn.net/?f=T%3D2%5Cpi%20%5Csqrt%7B%5Cdfrac%7BL%7D%7Bg%7D%7D)
L is length of the pendulum and g is acceleration due to gravity
At the bottom of Death valley, g = 9.8 m/s²
We need to find the value of g if the period of the pendulum is decreased by 5.00%.
T'=(T-0.05T)= 0.95 T
![T\propto \dfrac{1}{\sqrt{g} }\\\\\dfrac{T}{T'}=\sqrt{\dfrac{g'}{g}}\\\\\dfrac{T}{0.95T}=\sqrt{\dfrac{g'}{9.8}}\\\\\dfrac{1}{0.95}=\sqrt{\dfrac{g'}{9.8}}\\\\1.1=\dfrac{g'}{9.8}\\\\g'=10.78\ m/s^2](https://tex.z-dn.net/?f=T%5Cpropto%20%5Cdfrac%7B1%7D%7B%5Csqrt%7Bg%7D%20%7D%5C%5C%5C%5C%5Cdfrac%7BT%7D%7BT%27%7D%3D%5Csqrt%7B%5Cdfrac%7Bg%27%7D%7Bg%7D%7D%5C%5C%5C%5C%5Cdfrac%7BT%7D%7B0.95T%7D%3D%5Csqrt%7B%5Cdfrac%7Bg%27%7D%7B9.8%7D%7D%5C%5C%5C%5C%5Cdfrac%7B1%7D%7B0.95%7D%3D%5Csqrt%7B%5Cdfrac%7Bg%27%7D%7B9.8%7D%7D%5C%5C%5C%5C1.1%3D%5Cdfrac%7Bg%27%7D%7B9.8%7D%5C%5C%5C%5Cg%27%3D10.78%5C%20m%2Fs%5E2)
So, the new value of acceleration due to gravity is
.