Answer:
which pic...? there is no picture attached to your question
Answer:
Alfred Wegener
Explanation:
Alfred Wegener is a german meteorologist who proposed the theory that the continents drifted, and he presented it to the German Geological Society on January 1912.
Answer:
![r =3 *\sqrt{2} = 4.24 cm](https://tex.z-dn.net/?f=r%20%3D3%20%2A%5Csqrt%7B2%7D%20%3D%204.24%20cm)
Explanation:
given data
Radius of sphere 3.0 cm
charge Q = 2.0 m C
We know that maximum electric field is given as
![E_{MAX}= \frac{KQ}{r^{2}}](https://tex.z-dn.net/?f=E_%7BMAX%7D%3D%20%5Cfrac%7BKQ%7D%7Br%5E%7B2%7D%7D)
electric field inside the sphere can be determine by using below relation
![\frac{KQ}{r^{2}}= \frac{1}{2}*\frac{KQ}{R^{2}}](https://tex.z-dn.net/?f=%5Cfrac%7BKQ%7D%7Br%5E%7B2%7D%7D%3D%20%5Cfrac%7B1%7D%7B2%7D%2A%5Cfrac%7BKQ%7D%7BR%5E%7B2%7D%7D)
![r = \sqrt{2}R](https://tex.z-dn.net/?f=r%20%3D%20%5Csqrt%7B2%7DR)
![r =3 *\sqrt{2} = 4.24 cm](https://tex.z-dn.net/?f=r%20%3D3%20%2A%5Csqrt%7B2%7D%20%3D%204.24%20cm)
Answer:
![\dfrac{d\theta}{dt}=0.038\ rad/s](https://tex.z-dn.net/?f=%5Cdfrac%7Bd%5Ctheta%7D%7Bdt%7D%3D0.038%5C%20rad%2Fs)
Explanation:
Given that
![\dfrac{dx}{dt}= -1\ m/s](https://tex.z-dn.net/?f=%5Cdfrac%7Bdx%7D%7Bdt%7D%3D%20-1%5C%20m%2Fs)
From the diagram
![tan\theta=\dfrac{21}{x}](https://tex.z-dn.net/?f=tan%5Ctheta%3D%5Cdfrac%7B21%7D%7Bx%7D)
By differentiating with time t
![sec^2\theta \dfrac{d\theta}{dt}=-\dfrac{21}{x^2}\dfrac{dx}{dt}](https://tex.z-dn.net/?f=sec%5E2%5Ctheta%20%5Cdfrac%7Bd%5Ctheta%7D%7Bdt%7D%3D-%5Cdfrac%7B21%7D%7Bx%5E2%7D%5Cdfrac%7Bdx%7D%7Bdt%7D)
When x= 10 m
![tan\theta=\dfrac{21}{10}](https://tex.z-dn.net/?f=tan%5Ctheta%3D%5Cdfrac%7B21%7D%7B10%7D)
θ = 64.53°
Now by putting the value in equation
![sec^2\theta \dfrac{d\theta}{dt}=-\dfrac{21}{x^2}\dfrac{dx}{dt}](https://tex.z-dn.net/?f=sec%5E2%5Ctheta%20%5Cdfrac%7Bd%5Ctheta%7D%7Bdt%7D%3D-%5Cdfrac%7B21%7D%7Bx%5E2%7D%5Cdfrac%7Bdx%7D%7Bdt%7D)
![sec^264.53^{\circ} \dfrac{d\theta}{dt}=-\dfrac{21}{10^2}\times (-1)](https://tex.z-dn.net/?f=sec%5E264.53%5E%7B%5Ccirc%7D%20%5Cdfrac%7Bd%5Ctheta%7D%7Bdt%7D%3D-%5Cdfrac%7B21%7D%7B10%5E2%7D%5Ctimes%20%28-1%29)
![\dfrac{d\theta}{dt}=0.038\ rad/s](https://tex.z-dn.net/?f=%5Cdfrac%7Bd%5Ctheta%7D%7Bdt%7D%3D0.038%5C%20rad%2Fs)
Therefore rate of change in the angle is 0.038\ rad/s