Atoms consist of protons, neutrons and electrons
Explanation:
There are three particles in an atom:
- Proton: it is located in the nucleus. Its mass is
, and it is positively charged (its electric charge is 
, also called fundamental charge) - Neutron: it is also located in the nucleus. Its mass is slightly larger than the proton (
), and it has no electric charge. Protons and neutrons are held together inside the nucleus by the strong nuclear interaction - Electron: it is located outside the nucleus, in a region called "electron cloud". According to quantum mechanics, its exact position cannot be determined, but it can only be described by a "wave function" which gives the probability of finding the electron at a certain position. Its mass is much smaller than the proton (
) and it is negatively charged (its charge is the opposite of that of the proton: 
).
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Answer:
this is it
Explanation:
For every 9 turns of the driver the follower will make 4 complete rotations!
First let us compute for the total growth in population.
Growth = 155 million * 0.01
Growth = 1.55 million
Since there are 12 months in a year, therefore the new
jobs every month should be:
new jobs per month = 1.55 million / 12
<span>new jobs per month = 0.129 million = 129,167 </span>
Answer:
Top: PE = max, KE = 0
Middle: PE = half, KE = half
Bottom: PE = 0, KE = max
Explanation:
The potential energy of an object is the energy possessed by the object due to its location; it is given by
where
m is the mass of the object
g is the acceleration due to gravity
h is the height of the object from the ground
The kinetic energy of an object is the energy possessed by the object due to its motion; it is given by
where
v is the speed of the object
Now we analyze the three situations for the boy on the bycicle:
Top of the hill: here h (the height) is maximum, so the potential energy is maximum, while the speed is zero, therefore the kinetic energy is zero.
Middle of the hill: here h (the height) is half of the initial value, therefore the potential energy is also half of the initial potential energy. According to the law of conservation of energy, the total mechanical energy (potential+kinetic) is constant: this means that also the kinetic energy is half of the initial potential energy.
Bottom of the hill: here h is zero, therefore the potential energy is now zero. As a result, all the mechanical energy has been converted into kinetic energy, therefore the kinetic energy is maximum and it is equal to the potential energy of the boy when he was at the top.
Answer:
175 N/m
Explanation:
Given:
Force = F= 14.0 N
Distance = x = 8.00 cm = 0.08 m
To find:
spring constant
Solution:
spring constant is calculated by using Hooke's law:
k = F/x
Putting the values in above formula:
k = 14.0 / 0.08
k = 175 N/m
