__Protons and neutrons have similar mass.
__Electrons are smaller than a proton or a neutron.
Explanation:
The three particles involved in this problem are:
- Proton: it is positively charge, it is found in the nucleus of the atom, and its mass is  
- Neutron: it has no electric charge, it is also found in the nucleus of the atom, and its mass is approximately equal to that of the proton (just slightly larger)
- Electron: it has negative electric charge, it orbit around the nucleus of the atom, and its mass is much smaller than that of the proton:  
We can now analyze each of the given statement:
__Protons and neutrons have similar mass.  --> TRUE
__Protons and electrons have similar mass.  --> FALSE, the electron is much lighter
__Neutrons and electrons have similar mass.  --> FALSE, the neutron is much heavier
__Protons are smaller than a neutron or an electron.  --> FALSE, protons are similar to the neutrons
__Neutrons are smaller than a proton or an electron.  --> FALSE, neutrons are similar to the protons
__Electrons are smaller than a proton or a neutron. --> TRUE
Learn more about atoms:
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Answer:
I think it's<u> D. Getting divorced</u>
Explanation:
 
        
             
        
        
        
Momentum = mass x velocity 
12 = 4 x v | ÷ both sides by 4
12 ÷ 4 =v
v= 3 m/s
        
             
        
        
        
Answer:
- 1.07 ft
Explanation:
V1 = (-5, 7, 2)
V2 = (3, 1, 2)
Projection of v1 along v2, we use the following formula 
=\frac{\overrightarrow{V1}.\overrightarrow{V2}}{V2}
So, the dot product of V1 and V2 is = - 5 (3) + 7 (1) + 2 (2) = -15 + 7 + 4 = -4
The magnitude of vector V2 is given by
 = 
So, the projection of V1 along V2 = - 4 / 3.74 = - 1.07 ft
Thus, the projection of V1 along V2 is - 1.07 ft. 
 so we need to find the direction of v2