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| PAGE: 407 | SET: Exercises | PROBLEM: 91 |
(a).
Show that 
.
The voltage 
is 
.
Where, the frequency is 
.
The power 
is 
Where 
is resistance and 
is the time in seconds.
Substitute 
in 
.
Therefore, 
.
(b)
Observe the graph :
The graph of the function does not passing through the origin and shifted 
units downward.
hence,the graph of the function is a cosine function.
The geneal form of cosine function is 
.
Where, 
is amplitude and 
and 
is the phase shift.
Compare the equation with graph of the function.
Amplitude is 
and Period is 
.
.
Substitute all the values.
.
(c)
Deduce that 
.
Equate the two power functions.
Cancel the common terms.
.
(a) .
(b) .
(c) .
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