NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1949 - 1953 of 2142

Question

At what height above the earth’s surface the acceleration due to gravity will be of its value at the earth’s surface? Radius of earth is 6400 km

Question

The moment of inertia of a sphere of mass M and radius R ₂ about an axis passing through its center is -MR. The radius of gyration of the sphere about a parallel axis to the above and tangent to the sphere is,

Question

A cylinder of 800 g and radius 30 cm has moment of inertia (about its natural axis)

Question

The density of a rod AB increases linearly from A to B. Its midpoint is O and its centre of mass is at C. Four axes pass through A, B, O and C all perpendicular to the length of the rod. The moments of inertia of the rod about this axis are I _A, I _B, I _O and I _C respectively then:

(1) (2)

(3) (4)

Select the correct answers and mark it according to the following codes:

Question

Three particles of equal mass m are situated at the vertices of an equilateral triangle of side l. What should be the velocity of each particle, so that they move on a circular path without changing l?