Question 7
Gravitational FieldI. The earth is not spherical but elliptical in shape.
II. Variation in latitude and longitude.
III. Rotation of the earth on its axis.
IV. Variation in the density of the earth.
On which combination of the above does the weight of an object vary on the earth's surface?
- A.I, II, III and IV.
- B.II, III and IV only
- C.I, II and III only
- D.I and II only
Show the answer and explanation
Answer: C (I, II and III only)
Explanation
g changes over the earth's surface because the earth is flattened at the poles, because of the earth's rotation, and so with latitude. So weight varies for reasons I, II and III.