Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 11-science Answered

A door 1 m side, having a mass of 15 kg is hinged at one side so that it can rotatate without friction about the vertical axis. A bullet having mass 10 gm and speed 400 m/s is fired into the door in a direction perpendicular to the plane of the door and embeds itself at the exact centre of the door. Find the angular velocity of the door just after the bullet embeds itself. Is K.E conserved?
Asked by ayushikas | 14 Jan, 2012, 07:50: PM
answered-by-expert Expert Answer
 
 
Here you can use conservation of angular momentum.
 
Initially the door was at rest so the angular momentum of door was zero.
 
The angular momentum of bullet plus door system = 2Kgm2/sec.------(1)
 
After collision the bullet stick in to the door and they both rotate about the axis of the door.
 
So the angular momentum of the system= I(M.I. of the door bullet system)* w -----(2)
 
now we compare (1) and (2) 
 
Here the length of door is not given so it is not possible for us to fiond the M.I. of the door.
 
Please check that and try it further.
 
 
 
 
 
 
 
 
 
 
 
Answered by | 17 Jan, 2012, 02:49: PM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 11-science - Physics
obtain the expression for time period of simple pendulum performing shm.
Asked by rustampathan | 25 Feb, 2024, 06:39: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
explain how angular momentum can be expressed as the vector product of two vectors.how is it's direction determined discuss the cases of minimum and maximum angular momentum
Asked by gipaalsy | 08 Feb, 2024, 05:41: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
t
question image
Asked by rkdubey133 | 19 Jan, 2024, 10:03: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
rotational motion
question image
Asked by priyankaprajapti81 | 04 Nov, 2023, 10:47: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
please answer
question image
Asked by gdeadshot85 | 14 Jan, 2023, 09:58: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
three diSc each of mass m and radius r placed in contact with each otheer find moment of inertia
Asked by devanshchauhan325 | 23 Dec, 2022, 07:34: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
Prove that Torque acting due to a Force F in the x-y plane is Tau z=xfy-yfx.
Asked by koushtubhroy | 20 Dec, 2022, 07:36: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
one meter long string can bear maximum of 0.5 kg mass . a mass of 0.05 kg is tied to one end and rotated in a horizontal circle , calculate the maximum number of revolution so that string does not brakes
Asked by pushpakumari291279 | 20 Aug, 2022, 08:15: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
A Uniform Disc of diameter R/2 is put over another uniform disc of radius R of same thickness and Density. The peripheries of the two discs touch each other. The Centre of Mass of the system from centre of the big disc is? (I asked this question before but the answer was wrong. They took the Radius as R/2 while it is the Diameter)
Asked by adipadmakarri | 26 Sep, 2021, 06:08: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
A Uniform Disc of diameter R/2 is put over another uniform disc of radius R of same thickness and Density. The peripheries of the two discs touch each other. The Centre of Mass of the system from centre of the big disc is?
Asked by adipadmakarri | 25 Sep, 2021, 11:18: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×