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Contact forces has to be touching for it to be an actual force. A field force does not have to be touching but it does have to be acting on particles at different positions in a space.
Answer:
\Delta E=1.22\times 10^{-22}J
Explanation:
The energy of electron in any state is given by
here h is planck's constant n is state of electron L is the infinte potential well m is the mass of electron
We know that 
Potential well dimension = 
Mass of electron 
So energy required to electron to jump from ground state to 3rd state



Answer:
1.3 is equal to m times v to the second times PK, meaning the answer to your question is 3.3 K
Explanation:
Have a gday!
Answer:
a = 156.14 m/s^2
Explanation:
Using the laws of newton:
∑F = ma
where ∑F is the sumatory of forces, m the mass and a the aceleration.
so:
F -
= ma
where F is the force from the hockey stick and
is the force of friction.
Replacing values, we get:
(30.2N) - (3.5N)= (0.171kg)a
Finally, solving for a:
a = 156.14 m/s^2