Answer:
the rate of change in volume with time is 280πr² cm³/min
Explanation:
Data provided in the question:
Radius of the sphere as 'r'
= 70 cm/min
Volume of the sphere, V =
Surface area of the sphere as 4πr²
Now,
Rate of change in volume with time,
=
=
Substituting the value of ![\frac{dr}{dt}](https://tex.z-dn.net/?f=%5Cfrac%7Bdr%7D%7Bdt%7D)
=
= 280πr² cm³/min
Hence, the rate of change in volume with time is 280πr² cm³/min
Answer:
Explanation:
l = 200 m
i = 5 A west
B = 6 micro Tesla direction 30 degree north of east
angle between length vector and the magnetic field vector = 180 - 30 = 150 degree
Write the length and the magnetic field in the vector form
![\overrightarrow{l}=- 200 \widehat{i}metre](https://tex.z-dn.net/?f=%5Coverrightarrow%7Bl%7D%3D-%20200%20%5Cwidehat%7Bi%7Dmetre)
![\overrightarrow{B}= 6\times 10^{-6}\left ( Cos30\widehat{i}+Sin30\widehat{j} \right )Tesla](https://tex.z-dn.net/?f=%5Coverrightarrow%7BB%7D%3D%206%5Ctimes%2010%5E%7B-6%7D%5Cleft%20%28%20Cos30%5Cwidehat%7Bi%7D%2BSin30%5Cwidehat%7Bj%7D%20%5Cright%20%29Tesla)
![\overrightarrow{B}=\left ( 5.2\widehat{i}+3\widehat{j} \right )\times 10^{-6}Tesla](https://tex.z-dn.net/?f=%5Coverrightarrow%7BB%7D%3D%5Cleft%20%28%205.2%5Cwidehat%7Bi%7D%2B3%5Cwidehat%7Bj%7D%20%5Cright%20%29%5Ctimes%2010%5E%7B-6%7DTesla)
![\overrightarrow{F} = i \overrightarrow{l}\times \overrightarrow{B}](https://tex.z-dn.net/?f=%5Coverrightarrow%7BF%7D%20%3D%20i%20%5Coverrightarrow%7Bl%7D%5Ctimes%20%5Coverrightarrow%7BB%7D)
![\overrightarrow{F} = 5\times \left ( -200\widehat{i} \right )\times \left ( 5.2\widehat{i}+3\widehat{j} \right )\times 10^{-6}](https://tex.z-dn.net/?f=%5Coverrightarrow%7BF%7D%20%3D%205%5Ctimes%20%5Cleft%20%28%20-200%5Cwidehat%7Bi%7D%20%5Cright%20%29%5Ctimes%20%5Cleft%20%28%205.2%5Cwidehat%7Bi%7D%2B3%5Cwidehat%7Bj%7D%20%5Cright%20%29%5Ctimes%2010%5E%7B-6%7D)
![\overrightarrow{F} =- 3\times 10^{-3}\widehat{k}Newton](https://tex.z-dn.net/?f=%5Coverrightarrow%7BF%7D%20%3D-%203%5Ctimes%2010%5E%7B-3%7D%5Cwidehat%7Bk%7DNewton)
Thus, the magnitude of force is 3 x 10^-3 newton and it is directed towards negative z axis direction.
The statement "<span>Forces always act alone" is false. Force do not always act alone. It is always accompanied by another force that is always opposite to it. </span>
The doppler effect is the increase or decrease in the frequency of sound, light, or other waves as the source and observer move toward or away from each other.