A sound wave is a longitudinal wave
Answer:
Acceleration due to gravity will be ![g=5.718m/sec^2](https://tex.z-dn.net/?f=g%3D5.718m%2Fsec%5E2)
Explanation:
We have given length of pendulum l = 55 cm = 0.55 m
It is given that pendulum completed 100 swings in 145 sec
So time taken by pendulum for 1 swing ![=\frac{145}{100}=1.45sec](https://tex.z-dn.net/?f=%3D%5Cfrac%7B145%7D%7B100%7D%3D1.45sec)
We have to find the acceleration due to gravity at that point
We know that time period of pendulum;um is given by
![T=2\pi \sqrt{\frac{l}{g}}](https://tex.z-dn.net/?f=T%3D2%5Cpi%20%5Csqrt%7B%5Cfrac%7Bl%7D%7Bg%7D%7D)
So ![1.45=2\times 3.14\times \sqrt{\frac{0.55}{g}}](https://tex.z-dn.net/?f=1.45%3D2%5Ctimes%203.14%5Ctimes%20%5Csqrt%7B%5Cfrac%7B0.55%7D%7Bg%7D%7D)
![\sqrt{\frac{0.55}{g}}=0.230](https://tex.z-dn.net/?f=%5Csqrt%7B%5Cfrac%7B0.55%7D%7Bg%7D%7D%3D0.230)
Squaring both side
![{\frac{0.3025}{g}}=0.0529](https://tex.z-dn.net/?f=%7B%5Cfrac%7B0.3025%7D%7Bg%7D%7D%3D0.0529)
![g=5.718m/sec^2](https://tex.z-dn.net/?f=g%3D5.718m%2Fsec%5E2)
So acceleration due to gravity will be ![g=5.718m/sec^2](https://tex.z-dn.net/?f=g%3D5.718m%2Fsec%5E2)
Answer:
The difference between ice and steam in Celsius (Centigrade) is 100 deg.
So the difference between and 4 cm and 24 cm of the thread corresponds to 100 deg C.
So 8 cm is 4 cm greater than the ice point
4 cm / 20 cm = 1/5 since the steam point and the ice point are 20 cm apart
Then 1/5 * 100 deg C = 20 deg C the requested temperature