Element Symbol
Protons
Neutrons
Electrons Atomic # Atomic
Mass
7
lon? If yes,
charge
No
Nitrogen
7
N
Sodium
11
23
Yes, +1
Na
Gold
au
79
197
No
79
22
79
118
25
20
20
19
19
Titanium
Ti
Potassium
k
Mercury
Hg
Hydrogen H
19
41
80
76
201
0
1
lodine
I
127
Yes, -3
Uranium
92
92
238
Calcium
Ca
20
20
20
20
41
Yes, +2
Iron
Fe
30
Yes, +3
26
26
26

Which atomic model was proposed as a result of j. j. thomson’s work?

What is the coefficient of kinetic friction μk between the block and the tabletop?

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.