1VIRANG answer is given TRUE
ASSERTION REASON :-
1. STATEMENT 1-
When a soda water bottle falls freely from a height of h , the gas bubble rises in water from the bottom
STATEMENT 2 -
Air is lighter than liquid
2. S1- When an object collides with another object , the impulse during deformation and restituion will be in the same direction.
(true / false ) with reason.
3. A ball of mass m moving with a kinetic energy 3 J undergoes a head on elastic collision with another stationary ball of mass 2m . During impact , the potential energy of the system .
A>can be 3 J b> can be 2.5 J
c> can be 2.4 J d> can be 2 J
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19 Answers
1skygirl
http://targetiit.com/iit_jee_forum/posts/solve_dis_physics_sums_2_3004.html
third wala
abhishek
ok
uska answer nahi bataya
skygirl
kaun ?
abhishek
tisra
skygirl
kaun nahi bataya ?
abhishek
jo q diya
aur kaun
skygirl
arey .. :D
abhishek
:p
skygirl
tumhe kuchh mila ?
abhishek
mujhe lagta hai A hoga
skygirl
hmm!!!
abhishek
nahi nahi
kuch nahi lag raha aab
skygirl
kaise a hoga
hehheheh :D
:D :D
:D
:D
:D
:D
:D
:D
waise ans D bataraa....
abhisheks
heat se loss to hoga nahi
skygirl
arey max PE 2.67J
abhishek
ooh niche banayi ho usme
:P
dekhe hi nahi
skygirl
haan par ans sirf D hai :'(
:'(
:'(
abhishek
hai to D hi
E2=2
aega
skygirl
kyun ?
E2 kya hai ?
abhishek
KE2
v=1/3(6/m)^.5
tha naa
skygirl
haan....
abhishek
KE2=(1/2)3mv^2
skygirl
oh shit.....
haan...
abhisheks
1 aega
KE2=1
3m??
skygirl
i found pe diff...abhishek
oh
skygirl
:(
abhishek
uske soln me chat record post kar do
:P
skygirl
arey main wahi kar rahi thi :P
abhisheks
upar se E2=2 thik kar dena
waha KE2=1 hoga
:P
1[edited]
max PE when both the balls will have same velocity.
initially, u1=u1, u2=0 1/2mu1^2 =3
=> u1 =√6/m
now, mom conserv ,
m√6/m = 3m v
=> v =1/3√6/m
at this point, KE = 1/2 3 mv^2 = 1J (i missed this '3' last time... shit!)
so max P E = 2J.
hence ans is D :)
1i think the thrid one is a multiple choice and ans should be b,c,d.
(not tukka :P)
62Does this help?
me: see all the time the body will try to push the other
it is like normal reaction always
try to oppose the other body
simple
no matter whether it is compressing or relaxing
sky: ok ... but which impulse ?
i mean which direction ?
me: away from the ball which we are considering towards the other ball
sky: i mean B ON A OR AON B
me: yes
B on A
and similarly A on B
it is action reaction
sky: well well
there will be restitution in both
me: yes
sky: and those will have same direction
tx
:)
:P bad dbt :P
me: :)
1bhaiya da ans wer was given true and hint was written " REGAIN DUE TO ELASTIC FORCE " :(
62The impulse will always be opposing the motion of the ball..
I dont see why it is not obvious the during compression of the ball. the ball will try to push the other ball...
hence it iwll kind of repel ... (i know this is not the right phrase to use )
11Q2
False
The direction will be reversed
Since for Deformation the impulse will be directed towards the collision point. While during restitution it will be in the opposite direction
11Statement 1 is true and statement 2 is also true. But statement 2 does not explain the reason for Statement 1
The reason is there is an upward force(upthrust) provided by the liquid to the air bubbles and therefore the force acting downwards is reduced while the force on the liquid is the same. Therefore the liquid accelerates more than the air and hence it appears that the air bubbles rise.
1061.. st 1 is wrong.... in free falll, there is weightlessness hence the net force due to gravity is zero... hence buoyant force is zero... so it remains where it is.... bubbles dont rise up... (practically impossible due to fluid friction so dont try to do this practically. [3])
1063. b,c,d??
potential energy cant be 3J that means bodies will come to rest... i dont think so.. when max. pot. energy. then both vel. are same for both bodies...