D. The string vibrated because of resonance, which happened because the tuning fork and guitar string have same natural frequency.
4 main components are: Nitrogen, Oxygen, Argon and water vapour
Answer:
Resistance is a measure of the opposition to the flow of current in an electrical circuit.
Explanation:
It is symbolized by the Greek letter omega (Ω), resistance is measured in ohms.
If an electric current of one ampere passes through a component across which a potential difference (voltage) of one volt exists, then the resistance of that component is one ohm
Answer:
(a) The horizontal ground reaction force 
(b) The vertical ground reaction force 
(c) The resultant ground reaction force 
Explanation:
Given
John mass , m = 65 kg
Horizontal acceleration , 
Vertical acceleration , 
(a) Using Newton's 2nd law in horizontal direction

=>
Thus the horizontal ground reaction force 
(b) Using Newton's 2nd law in vertical direction

=>
=>
Thus the vertical ground reaction force 
(c) Resultant ground reaction force is

=>
=>
Thus the resultant ground reaction force 