24) An unexploded bomb is located somewhere where there is no external force on

Question

24) An unexploded bomb is located somewhere where there is no external force on it. The wick is ignited and the bomb explodes into many pieces, We can say that the position of the center of mass;

a) does not change position
b) moves in the direction of the pump piece of greater mass
c) moves in the direction of the pump piece of lower mass
d) moves with constant velocity perpendicular to the speed of the pieces of the pump

Justification =



25) When external forces act on a body or a set of particles, the center of mass moves

a) as if the whole mass were concentrated at that point and on it will act a net force equal to the sum of the external forces acting on the system.

b) as if the whole mass was concentrated at that point and a net force will not act on it.

c) with constant speed since at that point there may be no mass.

d) It does not move if there is no mass at that point.

Justification =

26) In the example illustrated in class of the U-shaped object and using the same information about the object, determine;

a) coordinate of the center of mass in X

Coordinate in X =

b) coordinate of the center of mass in Y

Coordinate in Y =

Explanation / Answer

24) Option A is correct, because center of mass changes it position only when an net external forces is non zero, in this case, forces are due to internal interaction.

25) Option A is correct, we consider net force is acting on a point at which whole mass of the body is supposed to be concentrated giving the same effect as in case of each small individual particles.

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