Complete Question
The complete question is shown on the first uploaded image
Answer:
Explanation:
From the question we are told
The amplitude of the lateral force is 
The frequency is 
The mass of the bridge per unit length is 
The length of the central span is 
The oscillation amplitude of the section considered at the time considered is 
The time taken for the undriven oscillation to decay to 
of its original value is t = 6T
Generally the mass of the section considered is mathematically represented as
=> 
=> 
Generally the oscillation amplitude of the section after a time period t is mathematically represented as
Here b is the damping constant and the 
is the amplitude of the section when it was undriven
So from the question
=> 
=> 
=> 
=> 
Generally the amplitude of the section considered is mathematically represented as
=> 
=> 
=> 
=> 
Answer:
b. 40V , 40V
Explanation:
Connections are as per the figure.
As total current through source is 4A , current through each lamp is 1A.
As total resistance of the circuit is 10Ω ,resistance of each bulb is 40Ω because in case of a parallel circuit in which identical objects are connected , 
where R is the resistance of each bulb and n is the number of bulbs.
As per Ohm's law , voltage of the source =IR = 4×10 =40V.
We can see from the figure that if the voltage across the source is 40V , the voltage across each bulb is also 40V.
Answer:
-200 N
Explanation:
The cabinet moves at constant velocity, so that means there's no acceleration.
Applying Newton's second law to the cabinet:
∑F = ma
F + 200 = 0
F = -200
The friction force is 200 N in the opposite direction.
An artesian well is a well
drilled into an artesian aquifer. An artesian aquifer is a small
aquifer which contains groundwater under positive pressure. Since the water is
under positive pressure, this forces the water level in the well to rise above
the water surface up to a point where hydrostatic equilibrium is reached. This
results in the formations of “Springs”.
Answer: Spring
