The electric force exerted by an electric field of intensity E on a charge q is equal to the product between E and q, so:
A pair of oppositely charged parallel plates is separated by 5.38 mm. A potential difference of 623 V exists between the plates.
1 answer:
You might be interested in
Answer:
n = 1810
A = 25 mm
Explanation:
Given:
Lateral force amplitude, F = 25 N
Frequency, f = 1 Hz
mass of the bridge, m = 2000 kg/m
Span, L = 144 m
Amplitude of the oscillation, A = 75 mm = 0.075 m
time, t = 6T
now,
Amplitude as a function of time is given as:
or amplitude for unforce oscillation
or
or
Now, provided in the question Amplitude of the driven oscillation
the value of the maximum amplitude is obtained
thus,
Now, for n people on the bridge
Fmax = nF
thus,
max amplitude
or
n = 1810
hence, there were 1810 people on the bridge
b)
since the effect of damping in the millenium bridge is 3 times
thus,
b=3b
therefore,
or
or
or
A = 0.025 m = 25 mm