<span>The act of constantly spraying the produce with distilled
water by the store is to make the vegetables keep fresh and moist. Now since we
know that water vaporizes over time, so we would really expect some water from
the carrots to be vaporized out hence resulting in reduction of overall weight
of the carrot due to loss of water.</span>
Idk but ithink is F
idk ijust think
People firstly believe that the planets move in a circular orbit until Newton came up with his hypothesis by inventing calculus so that we could understood and calculated planetary orbits and their accuracy.
<u>Explanation:</u>
- Everyone assumed the planets were perfect circles until Newton came up with an idea. Slowly people would make maps of the orbits that added circles on circles, and they could never really explain about the movement of the planet. They simply say that planets move on circles but they lacked the math to explain or prove it. Then Newton came up with an idea of inventing calculus so that we could understood and calculated planetary orbits and their accuracy.
- Firstly people used their observations and say that the orbits looked like circles, then they developed their models and did the math, and proposed their hypothesizes which were wrong, until Newton came along and tried to match a model that used elliptical orbits and invented the math that allowed him to make predictions with it. His model worked for most planets.
- However he could not explain about the planet Mercury for instance since it was a very strange orbit. Then after the Einstein's theory of General Relativity he could also explain very deeply about it.
- Scientists and Astronomers made hypothesizes that there was another planet orbiting too close to the sun to see with telescopes, called Vulcan, that explained mercury's orbit before Einstein's theory. Then long after we had telescopes which was good enough to see if there was a planet orbiting closer to the sun than mercury.
It's quite hard to explain without an example, but I'll give it a go:
Basically, you have to count the number of an element on one side of the equation, then count it on the other, and the aim of balancing the equation is to get the 2 values to be the same (as mass cannot be created or destroyed).
This involves multiplication of the molecule(s) on either side of the equation in order to balance the whole thing. Note this is not like maths, you dont have to do the same to both sides, but you <em>do</em> have to multiply out <em>entire molecules</em> - you cannot multiply just the H2 in H2O for example.
A reasonably basic example of this balancing is:
Fe + Cl2 = FeCl3
The first thing I notice is that there is an even number of Cl atoms on the left, and an odd number on the right, so the first thing I'll do is multiply the one on the right to get it to an even number, ie by 2.
Fe + Cl2 = 2(FeCl3)
Expanding that gives Fe2Cl6 (although you dont write it like that). So we need to get 6 Cl atoms and 2 Fe atoms by multiplying the left hand molecules by amounts if possible. If you look at that, we can achieve that, by multiplying Cl2 by 3, and Fe by 2.
2Fe + 3Cl2 = 2FeCl3
And there you have your balanced equation, you'll notice that the number of any given element has the same number of atoms on both sides of the equation.
Given:
8.32 J of heat
from 23.2 degrees C to 30.5
degrees C
heat capacity of aluminum is 0.90 J/g-K
Required:
m in grams
Solution:
H
= mCpT
(8.32 J) = m(0.90 J/g-K)(30.5 – 23.2)K
m = 1.27g