PHYSICS · Multi-part · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
A 10kg mass weighs 98N on Earth’s surface. The mass is first lowered into a mine to a depth of 80km and later lifted to a certain altitude above the surface such that its weight becomes exactly the same as inside the mine. Take Earth’s radius R=6.4×103km.
Answer the following.
(i) Calculate the weight of the mass at the 80km depth.
(ii) Determine the altitude above the surface at which the mass will have the same weight as inside the mine.
(iii) State whether the mass of the body has changed in either process and justify your answer briefly.