PHY p4 PROBLEMS

[fibrosa]

Oct 10/43/q2/cii
Why did we half the kinetic energy
Oct 10/43/q3/b
How do we do the calculations for this part so that the answer is 2cm above ab

May 04/q6
How to solve the Melting point of water column.Why is w 'O'


Oct o6/q4
How to calculate energy change,Final - Intitail or the opposite or Big - small


May 10/q3/b
How we know that accelartion is constant?


Oct 03/q3/bii
Work done must be zero if pressure of gass changes but marking scheme says that it is positive WHY?


Oct 09/42/q5 ai
Distance betwee one circle and the other of the field is same and the radius increases from the center of each circle is it TRUE?

 

[Xam]

May 04/Q6
for melting point W is 0 as there is no work done in expanding i.e e.g if it was boiling then work is done to push the atmosphere back so in that case W is used.... therefore only INTerNAL energy and Thermal energy should increase.... so Work done by the system is 0.

Oct 06/Q4
the onw with the larger Speed as K.E CANT be negative coz Velocities will become postive when v square it

May 10/q3/b
there is no resultant force as ball moving equally with equal magnitudes of forces so acc is constant

Oct 03/q3/bii
acc to equation: Q= U + W
so when there is no thermal energy supplied so Q is 0. and so equation becomes
U = - W
(and compression is work done AGAINST so W becomes -(-W))
U = W
Kinetic Energy is increasing as atoms are gaining speed,
K.E is directly proportional to Temp (keep this in mind)
SO, as k.e increases so does the Temperature....

Dont have Oct 09 and Oct 10 with me sorry....

 

[Xam]

& if it was U = -W
then temp would decrease as U is decreased

 

[beacon_of_light]

nov10: Ek is the kinetic energy of a molecule whereas the Ek given is the combined energy of protons + deuteron ...kindly See part b) this point is clearly mentioned there...

nov09: you just have todraw the pattern around wire X ... and yeah circles with increasing radii from the center ...

 

[WellWIshER]

GUYS i am very confused between u= q+w

which convention to follow

and wt does thermal energy mean here?? heat temp??? q??

please can some 1 xplain in detail

thank u