If you know physics you should know this...?

Question

If i launch 3 bottle rockets of varying weight, will the one with the most weight have a longer travel time? OR will the one with the least weight have more travel time?

Answer 1

here the Newton's 3rd law of motion and the law of inertia applies. its states that an objects continues in its state until an external force is applied to it e.g. if it is moving, it will keep moving and if it is static it will saty static. and greater the mass of the object the more force will be neede to change its state. so most weight will have longer travel time BUT, more force will also needed to make it move first.

if you meant to say that all of them are launched with same force, then obviously least weighing bottle will have most traveling time.

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Answer 2

I suppose you mean pressurised bottles that push water out as reaction mass.
If the bottle was filled with water, it wouldn't move, no air to push out the water.
If the bottle had no water, it would fly only tenths of seconds, until the air was out.
So there must be an ideal situation, but it is beyond me, the equations to take everything in account must be terribly difficult.

http://ourworld.compuserve.com/homepages/pagrosse/h2orckt.htm gives a computer model to compute flight time and height.

Answer 3

The height reached only depends on the acceleration which is due to gravity same for all three and independent of mass so all have same air travel time.

Answer 4

Has to reconcile time expired while using up fuel and height after stage 1 with velocity after stage 1, stage 2 being the projectile stage

Answer 5

Insufficient information.

The extra weight *could* be propellant (water and gas)

Other things being equal (amounts of water, pressure of gas)
the lighter bottle should go farther.