The third one sliding friction
Explanation:
Answer:
The equation for the object's displacement is 
Explanation:
Given:
m = 16 lb
δ = 3 in
The stiffness is:

The angular speed is:

The damping force is:

Where
FD = 20 lb
u = 4 ft/s = 48 in/s
Replacing:

The critical damping is equal:

Like cc>c the system is undamped
The equilibrium expression is:

Answer:
A
Explanation:
if he goes to the west, the east is opposite so 100-30
Answer:
The mass number 204 – 82 protons = 122 neutrons
Explanation:
Hope this helps!
Number 5 is A
number 6 is D