Q15 of 49 Page 10

What is a wobble?

The technology detecting irregularities in the motion of stars has been advanced to such an extent that even a very small irregularity in the motion of a star can be detected. Such an irregularity is called a wobble. A wobble may also indicate the possibility of a planet going round the star.

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13 What is the ratio of acceleration due to gravity on the earth to moon? 14 Define center of mass? When is the center of mass considered as center of gravity? 16 If a ball is thrown horizontally, what is
(i) the state of motion in that direction and
(ii) the force acting on the ball in the vertical direction? 17 What happens to the plants in the absence of gravity?