We have the following values used to solve this:
For ⁴₂He:
No of protons: 2
No of neutrons : 2
Mass of proton: <span>1.00728 amu
Mass of neutron: </span><span>1.00867 amu
Atomic mass: </span><span>4.002603 amu
The formula to solve for the mass defect is:
md = (mp + mn) - mo
md = (2x</span>1.00728 + 2x1.00867) - 4.002603
md = 0.029297
Therefore, the mass defect is 0.029297 amu
Answer:
where is the picture of star
The number of protons for an atom with 20 neutrons and 20 electrons will be 20.
<h3>
What is an atom ?</h3>
An atom is the smallest particle of an element. It consist of proton, neutron and electron.
To determine the number of protons and also identify the correct symbol for an atom with 20 neutrons and 20 electrons, we must first acknowledge the following facts
- Atom in a neutral state, the number of protons must be equal to number of electrons.
- Atom in a nuclear stable state, number of protons must be equal to the number of neutrons
Therefore, the number of protons for an atom with 20 neutrons and 20 electrons will be 20.
The symbol for this atom is Ca which is Calcium.
Learn more about Atom here: brainly.com/question/6258301
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Answer:
The fourth planet from the sun is Mars. There are 8 planets in our solar system. Its a source of debate of whether or not Pluto is a planet so there is 8 planets and not 9.
Explanation:
Answer:
11.72 m/s
Explanation:
Energy is conserved when there are no energy loses. So potential energy and kinetic energy must be the same at the beginning and at the end.
Mechanical energy is the addition of both energy types, which is conserved.
So E= P+ K,
E: Mechanical energy
P: Potential Energy
K: kinetic energy.
P= m*g*h
K= (m*v^2)/2
M:mass
G:gravity=9.8m/s^2
H:altitude=7m
V: Velocity.
So P+K is conserved,
P1+K1=P2+K2
At the beginning there's no movement, so V=0, then K1=0
At the end there's no altitude, so H=0, then P2=0.
For those reasons,
P1=K2
M*G*H= M*v^2*0.5. As M is in both sides, we can take it out, and replace gravity and altitude with the values we already have.
9,81(m/s^2)* 7m = v^2 *0.5
68.67 (m/s)^2 = v^2 *0.5
(68.67 (m/s)^2 :0.5) ^ (1/2)= |v|
137.34^0.5=|v|
11.72 m/s= |v|
The sign will depend on where are we considering the 0 so will it be positive velocity if it's increasing direction or negative if it is decreasing