Answer:In the case of burning wood, stored potential energy (in the form of chemical energy) in the log is released due to heating by other excited atoms. This chemical reaction is called combustion and requires oxygen. Combustion changes the potential chemical energy into kinetic energy in the form of heat.
Explanation:
Answer:
No work is done since no distance is given
Explanation:
Since no distance is given, the force is not doing any work
No work is done by the man since we do not know the distance or displacement.
Work is only said to be done when the force applied on an object moves it through a particular distance.
Work done = Force x distance.
Since no distance is given in this problem, we can as well assume that the force applied is doing no work on the object.
I believe the answer is all of the above.
<span>First, there is no external force acting on the asteroids ( I don't think so, since they are travelling at constant velocity).
Since there is no external force acting on the individual asteroids, their respective momenta are constant in time as well.
So, in your momentum v/s Time graph, the momenta for each asteroid will correspond to a straight line parallel to time axis.
This happens until they collide. On collision an impulse acts on each asteroid ( by Newton's third law, the same magnitude of impulse acts on the two bodies).
Due to this impulse, their respective momenta will change. You just need a little mathematics to figure out the respective momenta after the collision.
Keep in mind there is no external force on the system, so after collision, the asteroids would again move with constant velocities.
(Conservation of linear momentum of the system would help! You just need another equation to find out the velocities)</span>
