Answer: 2, the nuclear strong force drops to practically nothing at large distances.
Explanation: The protons and neutrons in the nucleus share subatomic particles called pions. This exchange is what keeps the protons and neutrons stuck together in the nucleus. Despite the strong force being the strongest force, it has a very small range. This is because pions have very short lifespans. So, the strong force would have literally no effect at large distances.
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Draw a vector diagram. The net force on particle 1 = F12 + F13 + F14 These forces have to be added as vectors.
We will resolve our forces along the direction 1-4 F12 (tot) = -kQq / a^2 in the direction of particle 4 F12 = -kQq *sin (45) / a^2 F12 = -kQq /( a^2 * sqrt(2) )
By symetry this is the same as F13 F13 = -kQq /( a^2 * sqrt(2) )
F14 = -kQQ / (Sqrt(2)*a) ^ 2
For net force on particle 1 :
F12+F13+F14 = 0 -2kQq /( a^2 * sqrt(2) ) + -kQQ / (Sqrt(2)*a) ^ 2 = 0
Some simple manipulation should give you :
Q/q = -2 sqrt(2)
Answer:
D. Hotel 3 because they will experience beach erosion
Explanation:
A beach groin is a man made structure which is used to protect the beach from sand erosion. It makes the water current to deviate in the other direction thus preventing the beach in the groin area to be eroded.
In the context, constructing a groin by Hotel 2 will prevent beach erosion in its area but this will lead to the soil erosion for the beach in front of hotel 3, thus affecting hotel 3. So Hotel 3 can sue Hotel 2 and stop the groin being constructed by the Hotel 2.
Hence the correct option is (D).