• 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
1,229
Reaction score
740
Points
123
y are we not considering the direction of velocity here? if I take -5 ans comes out to be C:/
 

Attachments

  • image.jpg
    image.jpg
    1.5 MB · Views: 8
Messages
2,738
Reaction score
6,309
Points
523
And also can someone please highlight that in MJ 2012 paper 23 question 5 part b i how do you get the current as 2 A?
 
Messages
42
Reaction score
19
Points
18
(June 2005/P22/Q5)

(b) light wavelength of 590nm is incident normally on a diffraction grating having 750 lines per millimetre.

the diffraction grating formula may be expressed in the form


(i) calculate the value of d , in metres , for this grating.(it gave no value for the angle theta ; how to proceed ? why ?)

(ii) determine the maximum value for the light incident normally on the grating.

Thanks
 
Messages
195
Reaction score
265
Points
73
The extension provided by each spring is e.
X: Springs are in parallel so extension will be 1/e+1/e=1/(resultant extension). Hence resultant extension is e/2.
Y: For both the series combinations the extension is 2e. Considering the parallel combinations: 1/2e+1/2e=1/(resultant extension). Hence resultant extension is e.
Z: For parallel springs extension is e/2 and when added to the 3rd spring the total extension is 3e/2.
So order of increasing extension is X-Y-Z.
 
Messages
1,229
Reaction score
740
Points
123
can somebody please explain why not C?
the pressure exerted by the gas in the flask on the right end of the tube causes the level to fall in it thereby causing the left hand tube level to rise, no?? :/ so the pressure exerted actually shud be only density*g*h because the reason why LEFT hand tube is rising is actually because the RIGHT hand tube level is falling, right? :( but this way the ans shud be C :/
 

Attachments

  • Screen Shot 2015-05-28 at 7.49.01 AM copy.png
    Screen Shot 2015-05-28 at 7.49.01 AM copy.png
    65.5 KB · Views: 9
Top