• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Physics: Post your doubts here!

Messages
162
Reaction score
305
Points
28
Can anyone tell me whether in theory papers they will cut marks for significant figures because sometimes it is to 2 and sometimes 3. Sometimes when the data is to 2 s.f. even the answers are to 3 s.f?
 
Messages
872
Reaction score
894
Points
103
The elastic potential energy is the energy under the graph. You count the number if small squares and multiply it by the area of one small square to find out the energy. The wire will be permantly stretched/extended a little since some if the energy has been converted into its inter al energy which has increased the spacing between its atoms and has hence permantly deformed it
 
Messages
102
Reaction score
122
Points
53
The elastic potential energy is the energy under the graph. You count the number if small squares and multiply it by the area of one small square to find out the energy. The wire will be permantly stretched/extended a little since some if the energy has been converted into its inter al energy which has increased the spacing between its atoms and has hence permantly deformed it
which graph should we consider for it? upper or lower?
 
Messages
872
Reaction score
894
Points
103
which graph should we consider for it? upper or lower?
Upper minus lower. The upper graph represents the energy absorbed by the wire to cause its extension l. The lower one represents the energy released by the wire to bring it back to its original position. But it doesn't return to its original position and the extra energy is stored as the wires internal energy or its elastic potential energy
 
Messages
872
Reaction score
894
Points
103
Hey on the surface of the earth, the gravational force of the earth on a man and the gravational force if the man on the earth ate equal rifht according to newtons third law, but as he goes up doesnt the gravational force of the man on the earth become greater than the gravational force of the earth on the man? I'm cleerly REALLY confused
 
Messages
195
Reaction score
495
Points
73
Suggest why a thin rod can bend more than a thick rod without breaking.
Explanation required.Thanks in advance.
 
Top