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Jan
3
awarded  Popular Question
Aug
1
awarded  Popular Question
Jul
27
awarded  Popular Question
May
5
awarded  Popular Question
Jan
17
revised How can we theoretically calculate the number of balloons needed to stop a bullet?
edited title
Jan
17
asked How can we theoretically calculate the number of balloons needed to stop a bullet?
Jan
3
revised Is there any net external force acting on the universe?
added 113 characters in body; edited title
Jan
3
asked Is there any net external force acting on the universe?
Nov
30
awarded  Popular Question
Nov
30
asked Can the relative position of two masses connected by a spring become negative?
Nov
22
accepted Is there a normal force on an object submerged in water?
Nov
22
comment Is there a normal force on an object submerged in water?
@VladimirVargas: Why isn't there a normal force?
Nov
22
comment Is there a normal force on an object submerged in water?
@VladimirVargas: Without touching the bottom of the container for sure.
Nov
22
asked Is there a normal force on an object submerged in water?
Nov
2
accepted What is the net force acting on a climbing man by the rope?
Nov
2
accepted When we are walking or running, which friction is exerted on our feet? Kinetic or static?
Nov
2
comment When we are walking or running, which friction is exerted on our feet? Kinetic or static?
Sorry, do you know the source of your theory? :-)
Nov
2
asked When we are walking or running, which friction is exerted on our feet? Kinetic or static?
Oct
20
comment Which inertial observer should I choose when using $\Delta U = -\Delta K$?
The earth is rotating, why can we define $\Delta U$?
Oct
20
accepted Which inertial observer should I choose when using $\Delta U = -\Delta K$?