The resultant of two forces acting on an object is maximum if the angle between them is
I. 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?
The efficiency of a machine is always less than 100% because the
Which of the following consists entirely of vector quantities?
