A mass M hangs on a massless rod of length l which rotates at a constant angular frequency. The mass M moves with steady speed in a circular path of constant radius. Assume that the system is in steady circular motion with constant angular velocity . The angular momentum of M about points A is which lies in the positive z direction and the angular momentum of M about point . The correct statement for this system is :
Option: 1 and are both constant in magnitude and direction
Option: 2 is constant, both in magnitude and direction
Option: 3 is constant in direction with varying magnitude
Option: 4 is constant, both magnitude and direction
We know,
Now with respect to A, we always get direction
of along +ve z -axis and also constant magnitude as mvr. But with respect to B, we get constant magnitude but continuously changing direction.
Study 40% syllabus and score up to 100% marks in JEE