Physics: Post your doubts here!

[nehaoscar]

Practical 34 is on 04 June...

Oh! I thought everyone was left with only MCQ's

 

[nehaoscar]

How to do this one?
C

 

[bubbles1997]

Aoa. Please post your guess for the upcoming chemistry practical code 34. Thanks!
https://www.xtremepapers.com/commun...vel-practical-guess-papers.41560/#post-926251

 

[nehaoscar]

B - average ke of remaining atoms is reduced? how?

 

[Ahmed Aqdam]

View attachment 54326
B - average ke of remaining atoms is reduced? how?

The more energetic molecules leave the surface so the molecules remaining have less kinetic energy.

 

[Mathemagical]

View attachment 54326
B - average ke of remaining atoms is reduced? how?

The most energetic molecules - those which possess the most kinetic energy - have sufficient energy to break the liquid bonds and escape into the atmosphere. This leaves behind the less energetic molecules, hence reducing the average kinetic energy of the remaining molecules.

 

[nehaoscar]

How to calculate?

 

[Mathemagical]

View attachment 54327
How to calculate?

Diagram 2 shows the zero error of the instrument. To calculate the accurate reading, use the formula: Actual reading - zero error.

 

[nehaoscar]

Diagram 2 shows the zero error of the instrument. To calculate the accurate reading, use the formula: Actual reading - zero error.

But then what is the least count? and is the actual value 2.5?
I'm getting 2.38... :/

 

[nehaoscar]

Why B? Why not C?

 

[nehaoscar]

Why D?

 

[nehaoscar]

How D?

 

[nehaoscar]

How is it D?

 

[princess Anu]

why is it C?

 

[nehaoscar]

How A?

 

[asadalam]

View attachment 54329
Why B? Why not C?

Initially it will have less speed as it falls from rest,after that it accelerates and falls quickly so distance fallen increases faster.C implies it already had speed at the start

View attachment 54331
Why D?

F is the total force applied and mgsina is the component of the force that actually works against gravity,i.e the useful force

View attachment 54332

How D?

Directed away so think of your face as positive end and paper as negative.Hence negative charge moves towards you.

View attachment 54333
How is it D?

Ammeters have a very small resistance,so most of the current will flow through the Ammeter as its separate from the resistors.Cant be B also as this combination in parallel has lowest overall resistance

 

[asadalam]

why is it C?

Its inelastic so cant have the same velocity as before(4mv).Also it rebounds so it cant have zero velocity(2mv).Hence it can have momentum change like so

2mv-(-mv)=3mv

 

[asadalam]

View attachment 54335
How A?

In these situations it helps to assign values to the quantities.Suppose each has R as 2 Ohm.So total Resistance is 3Ohm.Hence total emf will be 6 v using P=V^2/r and I will be 2A.Hence at a junction it will split equally as both have identical resistance and power dissipated will be I2R as 1^2 x 2 as 2 W

This will be the same if you assign any other values as well.

 

[princess Anu]

how to do this

 

[The Chill Master]

http://maxpapers.com/wp-content/uploads/2012/11/9702_w14_qp_41.pdf
Q5 b (i)
The Sarcastic Retard