Answer and Explanation:
The computation is shown below:
The ac frequency in the United States is 60 Hz
The ac frequency in Europe is 50 Hz
So,
Time for 25 spark in United stated is 25 ÷ 60 s
Time for 25 spark in Europe is 25 ÷ 50 s
Now
Tape length in United States is
= 0.5 × 9.8 × (25 ÷ 60)^2
= 0.85 m
= 85 cm
And,
Tape length in europe is
= 0.5 × 9.8 × (25 ÷ 50)^2
= 1.225 m
= 122.5 cm
So, As it can be seen that
= 122.5 cm - 85 cm
= 37.5 cm
Europe has 37.5 cm more than in the United States