Force is defined as the rate of change of momentum.
The initial amount of momentum is
because water stops when it hit the wall total change of momentum must be
.
Now let's calculate the force.
We need to find
. This is the amount of water hiting the wall per second.
Our final formula would be:
And now we can calculate the answer:
You're talking about a grain of sand or a stone or a rock that's drifting in space, and then the Earth happens to get in the way, so the stone falls down to Earth, and it makes a bright streak of light while it's falling through the atmosphere and burning up from the friction.
-- While it's drifting in space, it's a <em>meteoroid</em>.
-- While it's falling through the atmosphere burning up and making a bright streak of light, it's a <em>meteor</em>.
-- If it doesn't completely burn up and there's some of it left to fall on the ground, then the leftover piece on the ground is a <em>meteorite</em>.
As a form of potential energy I suppose, if you can think about making a cake, you have motivation to make a cake, you can make a cake. In that way, your thoughts allow for action, which equals energy.
Answer:
Explanation:
For answer this we will use the law of the conservation of the linear momentum P:
so:
0 =
where is the mass of the helmet, is the velocity of the helmet, is the mass of the hockey player and is the velocity of the hockey player after launch his helmet.
note: we will take the direction of the helmet like positive.
Replacing values, we get:
0 =
Solving for :
A: Some physical properties change, but the substance keeps its identity.