Physics: Post your doubts here!

[princess Anu]

....

 

[princess Anu]

why can't it be B? :/

 

[ashcull14]

A mass accelerates uniformly when the resultant force acting on it
A is zero.
B is constant but not zero.
C increases uniformly with respect to time.
D is proportional to the displacement from a fixed point.
ans is B ...why not C?

 

[princess Anu]

Thanks

When the slider is moved to Y, the potentiometer P and the voltmeter are in series {no current flows through Q} with almost all the resistance in the voltmeter {as stated in the question, the voltmeter has a very high resistance},
I have a question!, if the question had stated Voltmeter has a infinite resistance, then? there would have been no current in the voltmeter so the ans wud have been D, right?

see 120 at
http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-22.html

 

[princess Anu]

..

 

[princess Anu]

..

 

[princess Anu]

A mass accelerates uniformly when the resultant force acting on it
A is zero.
B is constant but not zero.
C increases uniformly with respect to time.
D is proportional to the displacement from a fixed point.
ans is B ...why not C?

f=ma since mass is constant F is proportional to acceleration, & since acc is uniform hence Force is uniform too!

 

[amal sharkawi]

can anyone answer this question plz???

 

[amal sharkawi]

can anyone answer this plzzz ?????

 

[funky brat]

View attachment 53993

can anyone answer this question plz???

Is that A?

 

[amal sharkawi]

Is that A?

yes
but how ??

 

[funky brat]

can anyone answer this plzzz ?????

View attachment 53995

Is it D?

 

[amal sharkawi]

Is it D?

NO it is B

 

[funky brat]

NO it is B

Oh I meant B.

 

[amal sharkawi]

Oh I meant B.

aha ok thanx

 

[funky brat]

can anyone answer this plzzz ?????

View attachment 53995

Particles= protons+neutrons+ electrons
Its nucleon no is 235 and it has lost 2 electrons which means it has 90 electrons since no of protons= no of electrons so add up 235 and 90 you get B.

 

[amal sharkawi]

NO it is B

why it is B ???

 

[amal sharkawi]

Particles= protons+neutrons+ electrons
Its nucleon no is 235 and it has lost 2 electrons which means it has 90 electrons since no of protons= no of electrons so add up 235 and 90 you get B.

OK GOT IT

 

[amal sharkawi]

 

[princess Anu]

is it A

View attachment 53997