Yes you are right. This does involve more trig that physics. So let's review the math for a bit.
Cos(2x) = cos^2(x) - sin^2(x) Substitute 1 - sin^2(x) for cos^2(x)
Cos(2x) = 1 - sin^2(x) - sin^2(x)
cos(2x) = 1 - 2*sin^2(x) Now we need to solve for sin^2(x)
2sin^2(x) = 1 - cos(2x)
sin^2(x) = (1 - cos(2x))/2
Now all we need do is make a few substitutions.
x = ωt
Substitute (1 - cos(2ωt))/2 for sin^2(ωt)
P = (Io)^2 *R * (1 - cos(2ωt))/2
P = (Io)^2*R/2 - (Io)^2*R cos(2ωt) / 2
I think if you follow it carefully, you will find that the answer is
B <<<<< Answer.
Answer:
72 doctors recommended the medicine
Step-by-step explanation:
The question above is interpreted thus.
9 out of 10 implies 9/10. If 80 doctors were surveyed, the number of doctors that recommended the medicine is 9/10 of 80 doctors. Therefore,
Therefore, in a survey where 9 out of 10 doctors recommended a certain medicine; and 80 doctors were surveyed, 72 doctors recommended the medicine.
Answer:
7+(x+5) (original equation)
x+12 (simplified)
Step-by-step explanation:
So we know the number is x
Since its just an expression we can’t make x equal to anything so the best we can do is simplify the expression given.
so 7 plus the sum of x and 5
7+(X+5)
Mow just simplify it
x+5 is x+5
x+5+7 is 12+x becuase 5+7 is 12 and I combined like terms
x+12
Answer:
3/6
Step-by-step explanation:
Because if you divide 3/6 by 2 you get 1/2