Question

For the function given, state the starting point for a sample period:f(t)=-100sin(50t-20)

Answer 1

\[\Huge\color{#480a99}{\mathbb{WELCOME\\TO\\OPENSTUDY}}\]

Answer 2

answer choices are (30,0), (2/5,100), (20,0),(2/5,0)

Answer 3

f(t) = sin(t) starts at (0, 0)

Even with an amplitude of 100, it will start at (0, 0)

We now have to consider the phase shift.

y = Asin(Bx - C) + D

The phase shift is C/B

What is the phase shift in your function?

Answer 4

i don't even know what to do. can u answer it for me? i have a test due and i need to pass it

Answer 5

What you can easily do is graph it:
https://www.desmos.com/calculator/gjek9vojsn

Where does it start at?

Answer 6

does it start at 0,0

Answer 7

No, it doesn't. That is where it would start at if we didn't have any phase shifts.

Answer 8

i don't know give me hint

Answer 9

I'm sorry but we're not allowed to help on tests/quizzes/exams/assessments here :/
that would be considered cheating :(
http://pages.citebite.com/c3n6a1q0a0mvl

Answer 10

@king2001

Looking at the graph, what is the first place it crosses the x-axis?
https://www.desmos.com/calculator/gjek9vojsn

Answer 11

the 10?

Answer 12

http://prntscr.com/ayhd95

Answer 13

ok whats next then

Answer 14

That is the point.

Answer 15

ok

Answer 16

so what would be the answer then

Answer 17

Look at your answer choices. All you need to do is convert 0.4 into a fraction.

Answer 18

that would be 2/5

Answer 19

would it be 2/5,100 right or 2/5, 0

Answer 20

The point in the graph says (0.4, 0)

The y-coordinate is 0. Which one of those two has 0 as the y-coordinate?

Answer 21

2/5,0

Answer 22

Correct

Answer 23

thanks. i have one more problem can u help me with it

Answer 24

Sure! Make a new post for it!

Answer 25

ok thx