13.2b Ex4 ON08 P4 Q1 Mass on Earth Surface | A2 G-Fields | Cambridge A Level Physics

[@BOBO_4869]

Haha they got me in question b)i), I didn't know. Great explanation though.

[@michaeldelaney3587]

yes, so gravity is what pulls centripetal force in a circle, otherwise, centripetal force is an outward thrust. meaning if core density increases so does the radius increase due to increased centripetal force.

[@mr-bean2306]

20:44 Miss you said that (R+h)² doesnot make any difference it is almost the same as (R)² ,so mountain and vallies add up in the context of height abive surface which is negligible ,I mean so g wont be affected by this.

[@mr-bean2306]

Also the equation wise we can directly say mass of planet is not constant why density.

[@danishqureshi2]

Gravity decreases with altitude, generally, we do not consider such a small change when considering a planet that is the reason why we say (R+h)2 = R2, but for this part of the question, as it asks about real-life scenarios (real planet) therefore, we can say that difference in radius can cause a difference in gravity or acceleration of a free fall.

[@danishqureshi2]

@Mr-bean Yeah the mass is not constant, but I think it's just because of the difference in material densities in different parts of a planet that cause this variation.

[@hamiyaralmazrui291]

Thank you

[@shabananaz9236]

Thankuu :)

[@unknown-mn9wo]

tysm!!

[@zulharamynemannow8494]

what provides the centripetal force when the object is in the equator and the planet is spinning?

[@ETphysics]

Gravitational attraction of masses?

[@zulharamynemannow8494]

@@ETphysics So centripetal force is provided by a fraction of gravitational force (gravitational force - normal force = centripetal force)?

[@khadijaasif7143]

@@zulharamynemannow8494yes because centripetal force is always defined as a resultant force so yes it is the resultant of Gravitational force and Normal reaction force

[@mashiatislam2036]

holy shit this was hard

[@studytoime958]

can somebody please explain what orbital radius is and how it decreases if an object moves away from the equator

[@khadijaasif7143]

they explained it pretty well in the video, also the visual at 14:13 really helps in visualizing it and further understanding it

[@danishqureshi2]

It is the radius of the circular path of an object rotating around another object.