Answer:
a) 12.74 V
b) Two pairs of diode will work only half of the cycle
c) 8.11 V
d) 8.11 mA
Explanation:
The voltage after the transformer is relationated with the transformer relationshinp:

the peak voltage before the bridge rectifier is given by:

The diodes drop 0.7v, when we use a bridge rectifier only two diodes are working when the signal is positive and the other two when it's negative, so the peak voltage of the load is:

As we said before only two diodes will work at a time, because the signal is half positive and half negative,so two of them will work only half of the cycle.
The averague voltage on a full wave rectifier is given by:

Using Ohm's law:

Answer:
Therefore, Train A is faster with 50km/h and a 5km/h difference
Explanation:
train A
150km/3h = 50km/h
train B
180km/4h = 45km/h
Answer:
The value is 
Explanation:
From the question we are told that
The dielectric constant is k = 1.5
The area of each plate is 
The distance between the plates is 
The charge on the capacitor is 
Generally the electric field in a vacuum is mathematically represented as

Generally
is the voltage of the capacitor which is mathematically represented as

Here
is the capacitance of the capacitor in a vacuum which is mathematically represented as

Here
is a constant with value
=> 
=> 
So


So

=> 
The electric field when the dielectric slab is inserted is mathematically represented as

=> 
=> 
Generally the electric field between the plates is mathematically evaluated as

=> 
=> 
Generally the potential difference between the plates is

=> 
To calculate for the pressure of the system, we need an equation that would relate the
number of moles (n), pressure (P), and temperature (T) with volume (V). There are a number of equations that would relate these values however most are very complex equations. For
simplification, we assume the gas is an ideal gas. So, we use PV = nRT.<span>
PV = nRT where R is the universal gas
constant
P = nRT / V</span>
<span>P = 3.40 mol ( 0.08205 L-atm / mol-K ) (251 + 273.15 K) / 1.75 L </span>
<span>P = 83.56 atm</span>
<span>
</span>
<span>Therefore, the pressure of the gas at the given conditions of volume and temperature would be 83.56.</span>