A microscope is an instrument from which you can see the cells of an object.
It helps you to observe the cells of substance.
Powerful microscopes helps better in observing minute particles or bacterias.
Hope it helps...
Answer:
a magnet and sifter
Explanation:
a magnet will get all the iron filling and the sifter will separate the powder and sand
Explanation:
Given that,
Initial length of simple pendulum, ![L_1=1\ m](https://tex.z-dn.net/?f=L_1%3D1%5C%20m)
Initial time period, ![T_1=2\ s](https://tex.z-dn.net/?f=T_1%3D2%5C%20s)
We need to find the length of the simple pendulum when the period is exactly 1 second.
![T_2=1\ s](https://tex.z-dn.net/?f=T_2%3D1%5C%20s)
We know that the time period of simple pendulum is given by :
![T=2\pi \sqrt{\dfrac{L}{g}} \\\\T\propto \sqrt{L} \\\\\dfrac{T_1}{T_2}=\dfrac{L_1}{L_2}](https://tex.z-dn.net/?f=T%3D2%5Cpi%20%5Csqrt%7B%5Cdfrac%7BL%7D%7Bg%7D%7D%20%5C%5C%5C%5CT%5Cpropto%20%5Csqrt%7BL%7D%20%5C%5C%5C%5C%5Cdfrac%7BT_1%7D%7BT_2%7D%3D%5Cdfrac%7BL_1%7D%7BL_2%7D)
Put all values and find L₂
![\dfrac{T_1}{T_2}=\sqrt{\dfrac{L_1}{L_2}}\\\\L_2=\dfrac{T_2^2L_1}{T_1^2}\\\\L_2=\dfrac{1^2\times 100\ cm}{2^2\ s}\\\\L_2=25\ cm](https://tex.z-dn.net/?f=%5Cdfrac%7BT_1%7D%7BT_2%7D%3D%5Csqrt%7B%5Cdfrac%7BL_1%7D%7BL_2%7D%7D%5C%5C%5C%5CL_2%3D%5Cdfrac%7BT_2%5E2L_1%7D%7BT_1%5E2%7D%5C%5C%5C%5CL_2%3D%5Cdfrac%7B1%5E2%5Ctimes%20100%5C%20cm%7D%7B2%5E2%5C%20s%7D%5C%5C%5C%5CL_2%3D25%5C%20cm)
So, the length of the pendulum with a period of exactly one second is 25 cm.