Question

5 and 6

"PdF/dt U HULIUI? (iii) F+ dp/dt = 0 5.) (a) A point object of mass 10 Kg is rotating about an axis 1 metre away at an angular speed of 10 rad/second. Its moment of inertia about the rotation axis is: (i) 10 Kg?-Metre (ii) 100 Kg/Second (iii) 10 Kg-Metre? (b) Which one of the following equations (using standard nomenclature) is incorrect? (i) v=ro (ii) ac = v2/r (iii) o = da/dt (c) The moment of inertia of a uniform wheel about its axle does not depend upon its: (i) Diameter (ii) Mass (iii) Distribution of Mass (iv) Speed of Rotation 6.) (a) In equilibrium problems, torques can be calculated about any point: (1) Within the object. (ii) Outside the object. (iii) Within or outside the object. ch) Newton's second law in terms of angular momentum is: mis: (i) = IC (ii) t=dL/dt (iii) t=rxF The minimum number of vectors of unequal magnitudes needed to get a resultant zero vector (1) Two (ii) Three (iii) Four (iv) Five

Answer 1

5

a) I = mr^2 = 10* 1 = 10 kg m^2

b)

option (c) is correct answer

c)

option (d) in correct

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6

a) option (a) is correct

b) option (ii) is correct

c) option (ii) is correct

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