Physics: Post your doubts here!

[Rizwan Javed]

View attachment 60243

View attachment 60243

Can you post the whole question?

 

[mistique_bee]

Can you post the whole question?

 

[mistique_bee]

 

[Rizwan Javed]

View attachment 60245

The trace will be something like this^

 

[mistique_bee]

View attachment 60248
The trace will be something like this^

i dont get tht

 

[Rizwan Javed]

i dont get tht

I think i made a mistake It should have been like this^

First find the time periodf or the wave = 1/500 = 2ms
1 cm == 0.1 ms

draw a straight line across the grid as shown by the red horizontal line here. Then draw marks at 1 cm intervals. You can see that you can have at max 1ms on the grid. This means that half wave will be seen on cro.

The amplitude for the wave is given in the previous part, 5mV = 1 cm. So draw a point 1 cm above the straight line you drew. then join that point with smooth lines as shown.

Get it?

 

[Shah34]

Can someone plz solve my question????????

 

[mistique_bee]

Plz solve

For static equilibrium, the resultant force is zero. So the (upward) force in the spring is equal to the total (downward) weight of all the masses.
Spring force....T = 0.20 (10) + 0.1 (0.10) = 3N

When the thread is burnt, the weight of the 0.10kg mass no longer contributes any forces to the system, but at that (instant)... the spring force is still 3N.

So, the weight of the 0.20kg acts downwards while the spring force acts upwards. The resultant (upward) force on the 0.20kg mass is given by
Resultant force = ma = T – mg = 3 – 0.20(10) = 1N
Acceleration, a = 1 / 0.20 = 5ms-2

 

[Shah34]

O

For static equilibrium, the resultant force is zero. So the (upward) force in the spring is equal to the total (downward) weight of all the masses.
Spring force....T = 0.20 (10) + 0.1 (0.10) = 3N

When the thread is burnt, the weight of the 0.10kg mass no longer contributes any forces to the system, but at that (instant)... the spring force is still 3N.

So, the weight of the 0.20kg acts downwards while the spring force acts upwards. The resultant (upward) force on the 0.20kg mass is given by
Resultant force = ma = T – mg = 3 – 0.20(10) = 1N
Acceleration, a = 1 / 0.20 = 5ms-2

Okaaaay thanks

 

[mistique_bee]

part b(ii)

 

[mistique_bee]

 

[Rizwan Javed]

View attachment 60262
part b(ii)

Spring constant can be found by finding the gradient of the graph, since k = F/x

k = 4-0/(5-0)*10^-2
= 80 N/m

 

[Rizwan Javed]

View attachment 60263

Find the area under the graph upto F = 6.4N

work done = area under the graph
= 1/2 * 6.4 * 8 * 10^-2
= 0.256J

 

[mistique_bee]

Find the area under the graph upto F = 6.4N

work done = area under the graph
= 1/2 * 6.4 * 8 * 10^-2
= 0.256J

thnx alot

 

[mistique_bee]

part b

 

[Rizwan Javed]

View attachment 60264
part b

1P1 ---> it is the proton here which decays
1n0 ---> this is a neutron which is formed as a result of decay
0e+1 ----> it is a positron (anti matter of electron)
v ---> electron neutrino

 

[ashcull14]

Which year is this

nov 14 p41

 

[ashcull14]

how is no of photons = power / energy of photon?

 

[areeba240]

I'm going to appear for my AS LEVEL exams next month.....can anyone plzzz give me sm tips to score maximum marks in P1

 

[ashcull14]

I'm going to appear for my AS LEVEL exams next month.....can anyone plzzz give me sm tips to score maximum marks in P1

solve all the past papers of all variants
atleast from 2002 onwards
memorise the methods of difficult ques
in bio most mcqs r repeated
practice completing the mcqs within the time limit
move on to the next mcq if u cant understand a particular mcq once as the time limit is short and mark it
do the difficult ques in the end ..dont waste time on them or ull end up losing 3 to 4 marks after a single mark
• Attempt all questions – a mark is not deducted for a wrong answer.
• Use the space on the examination paper to write down clear working for each question. If you try to do too much working solely on your calculator or in your head, you will make mistakes – many of the wrong answers to a question can be reached by manipulating the data in a plausible, but incorrect, way.
• Carefully consider every one of the four possible answers before making your final decision as to which one is correct – although you may initially think that the first or second option is the right answer you will need to look at all four before the correct answer becomes clear
For Physics:-


hope it helps