Answer
Explanation:
As the three resistors are connected in series, the expression to be used for the  
calculation of RT equivalent resistance
 is:  
RT = R1 + R2 + R3
We replace the data of the statement in the previous expression and it remains:  
5 10 15 RT + R1 + R2 + R3 + +
We perform the mathematical operations that lead us to the result we are looking for:  
RT - 30Ω
 
        
             
        
        
        
Answer and Explanation:
The computation of the shortest wavelength in the series is shown below:-

Where
 represents wavelength
 represents wavelength
R represents Rydberg's constant
 represents Final energy states
 represents Final energy states
and  represents initial energy states
 represents initial energy states
Now Substitute is

now we will put the values into the above formula


Now we will rewrite the answer in the term of 

So, the whole Paschen series is in the part of the spectrum.
 
        
             
        
        
        
Answer:
- a.  
- b.  
Explanation:
<h3>
a.</h3>
The equation for the voltage V of  discharging capacitor in an RC circuit at time t is:

where  is the initial voltage, and
 is the initial voltage, and  is the time constant.
 is the time constant.
For our problem, we know

and 

So 





This gives us 

and this is the time constant.
<h3>
b.</h3>
At t = 18.8 s we got:



 
        
             
        
        
        
Answer:
thermometer
Explanation:
the thermometer measures temp.
 
        
                    
             
        
        
        
Answer:
friction
Explanation:
Her brakes will squeak and possibly slide or skid on concrete due to her brakes.
BUT it really depends on the condition of the wheels. Now it matters on the surface as well. Has the road been eroded? what has happened with her brakes? and what texture are the wheels? can seismic waves travel through them?