is the potential energy of the ball as it is half way through the fall, 20 meters high
<u>Explanation:</u>
Given data:
Height of the fall = 20 m
Given that the body is half-way through the fall, it is at above the ground 10 m
We need to find its potential energy (P.E)
Energy due to the body’s position is referred as potential energy. It means the energy when body is at rest. It can be expressed as below,
Where
m – The body’s mass
g - Acceleration due to gravity
h - Height of the body
By substituting the given values, we get
Since the mass is not provided, just kept it.
The specific heat of the metal : 0.384 J/g° C,
and a metal with a specific heat of 0.384 is copper
<h3>Further explanation </h3>
The law of conservation of energy can be applied to heat changes, i.e. the heat received / absorbed is the same as the heat released
Q in = Q out
Q lost(metal) = Q gained(water)
Heat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
Rutherford !
The so-called Rutherford experience consisted mainly of launch, against a gold plate, with a beam of particles emitted by a radioactive source. These particles whose electric charge is positive are known as alpha particles.
hope this helps!<span />
Answer: Two answers apply to physical change:
1-Condensation of Ethanol
2-Evaporation of Ethanol
Explanation:
Physical and Chemical changes are two very different types of change. However, both processes are possible because of the same thing: the investment of energy.
Physical change requires a lower investment of energy and this is the reason why these kind of changes can be reverted and the molecular structure of the matter does not change.
For example: I can easily change the state of water with fire or a fridge, and go from ice to liquid to vapor and back as many times I want. This is possible because I'm not giving enough energy to break or modify bonding forces inside the molecule of water, but enough energy to modify the interaction between two different molecules of water.
This is why Ethanol can be evaporated and then condensated into liquid again, representing this physical changes.
Chemical change, on the other hand, requires a higher investment of energy and because of this is that the bonds between atoms inside a molecule can be affected (bonds between atoms in the molecule are stronger). Therefore, when the molecules themselves are modified, the matter is transformed from a compound into a new one. This is why glucose becomes carbon dioxide, ethanol or carbon. These three compounds appear when the bonds between Carbons in the glucose are broken.
Answer:
10
Explanation:
Basically same as last question but the number is before the compound :)