Small objects vibrate quickly and produce lots of waves each second, and as the length of the bells are short the wave length become short too,so small bells have a high frequency hence high pitch.
        
             
        
        
        
Answer:

Explanation:
The 4 wires are connected in series: this means that the same current flow through them, and the voltage of the battery, V0, is equal to the sum of the voltages on each individual resistor:

Also, the equivalent resistance of the series circuit is

The voltage V2 across wire 2 is given by Ohm's law:
 (1)
 (1)
where I is the total current in the circuit, which is given by:

Substituting this into eq. (1), we find an expression for V2:

 
        
             
        
        
        
Answer:
1.4s
Explanation:
Given parameters: 
Mass of ball  = 2kg 
Force  = 8N 
Time  = 0.35s 
Unknown: 
Change in velocity  = ? 
Solution: 
To solve this problem, we use the expression obtained from Newton's second law of motion which is shown below: 
       Ft  = m(v  - u)
  So; 
          Ft  = m Δv
F is the force 
t is the time 
m is the mass 
Δv is the change in velocity 
              8 x 0.35  = 2 x Δv
                   Δv  = 1.4s