O-Level Physics

[ilovegoodkopi]

Hi Luna


For Question 12, the reason you answered 0 is because you assumed all surfaces (including the surfaces of the boxes) are frictionless.
Hence, the box Q can be pulled from under without affecting P?

If the box Q can be pulled from under without affecting P, the answer wouldn't be 0 too. Weight of P acts on it causing it to free fall.

lunamoon:

Hello I have a few physics questions I don't understand even with the answer. Or is there something wrong with the answer? Please help me thank you for your time.

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https://lh5.googleusercontent.com/-kwyGwddzt7E/U4_0YUZ44aI/AAAAAAAADY0/YJF-8Qx5Wcc/s640/blogger-image--1626624701.jpg\">

https://lh4.googleusercontent.com/-cKG2ysyubts/U4_0ag-a5XI/AAAAAAAADZE/dCtSrnJ_ih8/s640/blogger-image-693004135.jpg\">

https://lh6.googleusercontent.com/-zN2WNgx48UU/U4_0ZvZs-1I/AAAAAAAADY8/QpyRACoCxD4/s640/blogger-image--139834729.jpg\">

Thank you once again. :boogie:

[ilovegoodkopi]

Work done on the basket?


If the basket continues to be at constant height (from ground) --> no change in its GPE
If the basket continues to be at constant speed --> no change in its KE

So no work done on basket by the boy then.....

sunnymoon:

Can someone help me with the following questions? Thanks
A basket is being carried by a boy at a constant height above the ground. Is there work done?

[sunnymoon]

Thank you to ilovegoodkopi for answering my question.

[lunamoon]

hello thanks guys I understood the explanation. :grphug: Thank you for your effort

[Robertpattinsonidle]

please tell me how to solve this qsn! for the second qsn that says \"what is the pressure of the gas, px?\" Assume atmoshperic pressure is 77 cm Hg http://i61.tinypic.com/2dam3ib.png\">

[Nebbermind]

ASAP.

[Kafer]

May i know how to solve this qn?


an unknown translucent liquid has a reflective index of 1.75

what is the maximum angle of refraction within the liquid if a neam of light passes fr air into the liquid?
A. 32.7
b. 34.8
c. 55.2

[Kafer]

May i know how to solve this qn?

[tutor76]

As the formula ,refractive index = 1/sin c ,where c is the critical angle


So critical angle is 34.8

So 90 degree minus 34.8 degree is 55.2 which is choice C.

Cheers

[tutor76]

Kafer:

May i know how to solve this qn?


an unknown translucent liquid has a reflective index of 1.75

what is the maximum angle of refraction within the liquid if a neam of light passes fr air into the liquid?
A. 32.7
b. 34.8
c. 55.2

My personal opinion is that this question is set unfairly ,its possible to have amswer which is more than the critical angle ,as this question never elaborate on the condition it wanted .