The weight of an object is more at the poles than at the equator. Is it beneficial to purchase goods at equator and sell them at the pole? Does it matter whether a spring balance is used or an equal beam balance is used?

Read the following statements : S_(1) : An object shall weigh more at pole than at equator when weighed by using a physical balance. S_(2) : It shall weigh the same at pole and equator when weighed by using a physical balance. S_(3) : It shall weigh the same at pole and equator when weighed by using a spring balance. S_(4) : It shall weigh more at the pole than at equator when weighed using a spring balance. Which of the above statements is/are correct ?

Why do spring balances show wrong readings of weight after they have been used for a long time?

Assertion :- A clothline hangs between two poles. No matter how tightly the line is stretched, it always sags a little at the centre. Reason :- In above case, horizontal stiring cannot balance vertical weight.

Amit buys some gram of gold on North pole as his friend told him. He sold this gold to his friend on equator .Will his friend be happy with the weight of gold that he bought ? Why . (Hint : The magnitude of g on the poles is more than that at equator).