A) 20 N
B) 10 N
C) 5 N
D) 15 N
Correct Answer: A
Solution :
Key Idea: An acceleration is always produced by a force that is directed towards its centre. A body performing circular motion is acted upon by a force which is always directed towards the centre of the circle. This force is called centripetal force. In the absence of this force circular motion is not possible. \[F=mass\times acceleration\] \[F=\frac{m{{v}^{2}}}{r}\] Also \[v=r\omega ,\]we have \[F=m{{\omega }^{2}}r\] Putting the numerical values from the question, we have \[\therefore \] \[F=5\times {{(2)}^{2}}\times 1\] \[F=20\,N\]You need to login to perform this action.
You will be redirected in
3 sec