Answer:
Momentum (P) is 20kgm/s
Explanation:
P is the product of the mass and velocity of a moving object
P= m. v if we substitute the values of mass and the velocity as given in the pproblem
P=5 . 4 = 20kgm/s
Okay, so lets look at the equation.
The Skate accelerates at 2.0m/s². This can confuse some people but basically all you need to do is plug in the seconds.
So lets do 1 second. It would be 2.0m/1² which is 2.0m.
Lets do 2 seconds. It would be 2.0m/2² which is 0.5m.
Lets do 3 seconds. It would be 2.0m/3² which is 0.222m
Lets do 3.5 seconds which is about 0.163m.
Add those together and you get 2.885m.
This may be wrong but this is what I got given what you gave (that its seconds squared).
The three earth spheres which interact in this process are THE ATMOSPHERE, THE HYDROSPHERE AND THE BIOSPHERE.
The increase in the green house gases is destroying the ozone layers of the atmosphere, this makes it possible for more ultraviolet rays to penetrate through the atmosphere unto the earth surface. The increased temperature provided by these rays is warming up the oceans and this in turn is affecting the animals and the plants that reside in the oceans and those that depend on them. These chains of activities is changing the climate of the world and is affecting all the living things that live on the earth surface.
You just need the energy of turning of water in to steam. Water is a little funny because once water gets to 100 degrees C, it stops changing in temperature whilst it all turns to steam. The amount of energy required to turn 1 gram of water into steam is 2257 Joules. We call this the latent heat of vaporisation. So to turn 74.6 grams of water to steam, you would need:
2257J/gram x 74.6g = 168,372.2 J = 168.4 kJ
(<span></span><em>latent heat of vaporisation: 2257 J/gram</em>)
