Period = 6 seconds and  .
 .
<u>Explanation:</u>
We have , the motion of a swing that requires 6 seconds to complete one cycle. Period is the amount of time needed to complete one oscillation . And in question it's given that 6 seconds is needed to complete one cycle. Hence ,Period of the motion of a swing is 6 seconds . Frequency is the number of vibrations produced per second and is calculated with the formula of   . SI unit of frequency is Hertz or Hz. We know that time period is 6 seconds so frequency =
 . SI unit of frequency is Hertz or Hz. We know that time period is 6 seconds so frequency =    
 
⇒ 
⇒ 
⇒ 
Therefore , Period = 6 seconds and  .
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the answer is d i took the test be cause i go to a k12 onlie school
 
        
                    
             
        
        
        
Answer : The correct option is, (c) 
Explanation :
First we have to calculate the energy or heat.
Formula used :

where,
E = energy (in joules)
V = voltage (in volt)
I = current (in ampere)
t = time (in seconds)
Now put all the given values in the above formula, we get:


Now we have to calculate the heat capacity of the calorimeter.
Formula used :

where,
C = heat capacity of the calorimeter
 = initial temperature =
 = initial temperature = 
 = final temperature =
 = final temperature = 
Now put all the given values in this formula, we get:


Therefore, the heat capacity of the calorimeter is, 