|
|
|
|
New Member
|
|
Nov 6, 2012, 12:47 PM
|
|
A 3kg trolley is travelling at 3ms-1 an object of mass 1.5kg is dropped onto it what
A 3 kg trolley is travelling at 3 ms-1 an object of mass 1 .5kg is dropped onto it what is the new velocity of the object
My question is asking for the formulas that are need and the answer of how to work out this question
|
|
|
Expert
|
|
Nov 6, 2012, 12:50 PM
|
|
Use conservation of momentum:
|
|
|
New Member
|
|
Nov 6, 2012, 12:57 PM
|
|
Originally Posted by ebaines
Use conservation of momentum:
so could u help me out into working this question please because i don't quite understand
|
|
|
Expert
|
|
Nov 6, 2012, 01:03 PM
|
|
Momentum is determined by an object's mass multiplied by its velocity. In many physics problems we can apply the concept of conservation of momentum, which says that the momentum of a system remains constant. So in this case the momentum of mass number 1 (the 3 Kg trolley) travelling at velocity v_1 (3 m/s) should equal the momentum of mass 1 plus mass 2 (the 1.5 Kg extra mass) traveling at some unknown new velocity, v_2. You should be able to solve for v_2. Post back with your attempt and we'll check it for you.
|
|
|
New Member
|
|
Nov 6, 2012, 01:19 PM
|
|
OK so for m1v1=(m1+m2)v2
I did m1(3) v1(3)=m1(3)+(1.5)=4.5
is it correct
|
|
|
New Member
|
|
Nov 6, 2012, 01:28 PM
|
|
Originally Posted by ebaines
Momentum is determined by an object's mass multiplied by its velocity. In many physics problems we can apply the concept of conservation of momentum, which says that the momentum of a system remains constant. So in this case the momentum of mass number 1 (the 3 Kg trolley) travelling at velocity v_1 (3 m/s) should equal the momentum of mass 1 plus mass 2 (the 1.5 Kg extra mass) traveling at some unknown new velocity, v_2. You should be able to solve for v_2. Post back with your attempt and we'll check it fo you.
OK so for m1v1=(m1+m2)v2
I did m1(3) v1(3)=m1(3)+(1.5)=4.5
is it correct
|
|
|
Expert
|
|
Nov 6, 2012, 01:30 PM
|
|
So far so good - you have values for m1, v1, and (m1+m2). Now, what do you get for v2?
|
|
|
New Member
|
|
Nov 6, 2012, 01:59 PM
|
|
Helooooooooooooo... anybody
|
|
|
New Member
|
|
Nov 6, 2012, 02:00 PM
|
|
For v2 I got 4.5
|
|
Question Tools |
Search this Question |
|
|
Add your answer here.
Check out some similar questions!
Mass of an object
[ 4 Answers ]
An object is found to move with an acceleration of magnitude 6 m/s2 when it is subjected to a force of magnitude 214 N. How do I find the mass of the object?
Charged object with mass in uniform electric field.
[ 1 Answers ]
Does anyone know how to relate these things together?
Uniform electric field (given)
Charged object (charge given) in that electric field
w/a mass... must be found when the object is "floating" on the field
...
View more questions
Search
|