Answer:
The acidity level of water is measured by the pH scale. Pure water has a pH of 7, which is neutral. However, natural rainwater actually has a pH of 5.6 because it gets exposed to the gases in the atmosphere, making it a bit acidic. True acid rain will have a pH level measuring from 5.0-5.5.
Potential energy = (mass) x (gravity) x (height) .
To raise the 20kg block 6 meters, you need to give it
(20 kg) x (9.8 m/s²) x (6 m) = 1,176 joules
of potential energy.
Your machine takes 2,000 joules of energy to give the block
the 1,176 joules that it takes.
Your machine is only (1176 / 2000) = 58.8% efficient .
The other 'missing' 824 joules of energy doesn't just disappear.
It heats the machine, and the air around it. The final result is
that when you use that machine to lift blocks, you have to use
even MORE energy, to blow cool air on the machine and prevent
it from overheating and breaking.
The kid is jumped and beat up from some bullies at school, he may be afraid that they will beat him again worse if he tells on them. <span>Fear of retribution.</span>
If the mistletoe population decreased I size the carrying capacity of the apple trees could increase.
<u>Explanation:</u>
Mistletoe is a parasitic species that can affect several tree species. In a parasitic relationship only one party will be benefited while the other party will be affected negatively. The scientific name of common mistletoe is Viscum album L. and it can affect tree vitality and productivity.
Mistletoe can affect the flowering and fruiting of trees which makes apple trees lag behind in fruit production. The infection can also make the trees more susceptible to further attacks from other pests. Thus controlling mistletoe infection would help greatly in improving tree health and productivity.
