Why do we need to know the centre of mass of an object? For which objeects, its position may differ from that of the centre of gravity?

The centre of a mass of any object having uniform density is at its centroid

Why do we differ from our parents?

The radius of gyration a body about an axis at a distance of 6 cm from its centre of mass is 10cm. Find its radius of gyration about a parallel axis through the centre of mass?

Which of following statements are correct ? ltbgt (a) Centre of mass of a body always coincides with the centre of gravity of the body (b) Central of mass of a body is the point at which the total gravitational torque on the body is zero (c ) Couple on a body produces both translational and rotation motion in a body (d) Mechanical advantage greater than one means that small efforts can be used to lift a large load

Assertion : The centre of mass of a body may lie where there is no mass. Reason : The centre of mass has nothing to do with the mass.

Select the appropriate options and complete the following paragraph (Velocity, independent, initial velocity, dependent, gravity, friction, final velocity , direction ) The motion of any object under the influence of the force of ______ alone is called as free fall. During free fall, there will be no change in the ______ of motion of the object. But there will be a change in the magnitude of ______ of the object due to the gravitational pull of the earth . The acceleration that an object experiences during free fall is ____ of the mass of the object undergoing motion. when a body is dropped freely from a height, its ______ is zero. Whereas when a body is thrown vertically upwards, its ________ is zero .

Choose the correct options Select WRONG statement about centre of mass: A. Centre of mass of a 'C' shaped uniform rod can never be a point on that rod. B. If the line of action of a force passes through the centre of mass, the moment of that force is zero. C. Centre of mass of our Earth is not at its geometrical centre. D. While balancing an object on pivot, the line of action of the gravitational force of the earth passes through the centre of mass of the object.

M_e is the mass of earth and M_m is the mass of moon ( M_e=81 M_m ). The potential energy of an object of mass m is a distance R from the Centre of earth and r from the centre of moon, will be

Answer the following questions: When an object is moved from the centre of curvature of a concave mirror towards its focus, what change do you observe in the size of the image?

Look at the drawing given in the figure which has been drawn with inkl of uniform line-thickness. The mass of ink used to draw each of the two inner circle, and each of the two line segments is m. The mass of the ink used to draw the outer circle is 6m. The coordinates of the centres of the different parts are: outer circle (0, 0), left inner circle (-a, a), right ineer circle (a, a), verticle line (0, 0) and 1 horizontal line (0, -a). The y-coordinate of the centre of mass of the ink in this drawing is