Physics: Post your doubts here!

[GarryTheGhost]

I guess it’ll be something from magnetism!

what makes you think that?

 

[Kanekii]

Anyone can tell me the s.fs of paper 2?? 2 or 3 s.fs? ;( and good luck on your tmr's exam!

Its usually 3 but its always stated at the front page of the the exam under instructions. Also for some questions they specify how many significant figures

 

[Sijanshrestha]

Hello, can anyone please help me with the figure of question no. 1 of paper 52 of Feb/March 2018????

 

[Sijanshrestha]

I guess it’ll be something from magnetism!

How did you know that?

 

[Ebrahim12]

Anyone can tell me the s.fs of paper 2?? 2 or 3 s.fs? ;( and good luck on your tmr's exam!

In the final answer you should use the same number of sigfigs as the value with the smallest number of sigfigs in your calculation.

Example:

m = 1.90 kg (3sf)
v = 2.3 ms^-1 (2sf)

The kinetic energy here should have 2sf.

 

[Jihoo Lee]

In the final answer you should use the same number of sigfigs as the value with the smallest number of sigfigs in your calculation.

Example:

m = 1.90 kg (3sf)
v = 2.3 ms^-1 (2sf)

The kinetic energy here should have 2sf.

Got it. if the previous question is "show that~", should I use that value in the question or the value I calculated in more s.f ?

 

[Ebrahim12]

Got it. if the previous question is "show that~", should I use that value in the question or the value I calculated in more s.f ?

Either one works

 

[Mts.99]

How does vertical velocity of projectile change with time if theres no air resistance?

 

[A*****]

How does vertical velocity of projectile change with time if theres no air resistance?

There is constant acceleration so v changes at a constant rate of 9.81m/s²

 

[amina1300]

Q If the P5 question in march 2018 came from youngs modulus and the waves section it means that these topics won't be repeated in tommorows exam?

 

[Mts.99]

There is constant acceleration so v changes at a constant rate of 9.81m/s²

means its should be a straight line thru origin right?

 

[A*****]

means its should be a straight line thru origin right?

Yes

 

[ba-lock-ey]

Anyone can tell me the s.fs of paper 2?? 2 or 3 s.fs? ;( and good luck on your tmr's exam!

It depends on the data given. For example, all the values you work with are to two sf so you put your answers to 2 sf. Then again, sometimes they tell you to how many sf your data must be given in.

 

[ba-lock-ey]

How does vertical velocity of projectile change with time if theres no air resistance?

Acceleration is always 9.81 ms-1. Horizontally, there is no change but vertically, if your velocity increases uniformly when there is no air resistance because acceleration is always 9.81 ms-1

 

[Psyvlone007]

No

Q If the P5 question in march 2018 came from youngs modulus and the waves section it means that these topics won't be repeated in tommorows exam?

Cant depend because Feb 18 chem 22 and may june 18 22 both excluded partial pressure/conc. Question

 

[furuta]

Any predictions for physics p5 tmrw?

 

[Candy22]

how many marks is the diagram worth in Q1 for paper 52?

 

[ughkno]

how many marks is the diagram worth in Q1 for paper 52?

Drawing the diagram itself has 1 mark. Including any additional details within the diagram gives you more points.

 

[Holmes]

how many marks is the diagram worth in Q1 for paper 52?

1 only

 

[Holmes]

Any predictions for physics p5 tmrw?

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