Question

Estimate the angle of rotation of the stars in the time-lapse photo.
http://cds.flipswitch.com/tools/asset/media/111660

Answer 1

Help please :/

Answer 2

@dan815

Answer 3

Im not sure if its 90 or 180

Answer 4

If you were to create an angle i'm confused

Answer 5

From what angle are we looking at it from?

Answer 6

Time lapse photography is made by placing a camera on a tripod and keeping the camera’s shutter open for a long time. If the camera is pointed in the direction of the stars, the stars appear to rotate around Polaris, also known as the North Star or the Pole Star.

Answer 7

thats all it gave me

Answer 8

would it be 90

Answer 9

I think you are correct, but I'm not a 100% sure.

Answer 10

okay thank you very much

Answer 11

so this is what it may look like right, as it's pointed towards the stars, and is rotating around polaris, so that must be 90 degrees.

Answer 12

Maybe not exactly, should be close to that...what do you think

Answer 13

yeah thats what I though and the options were 30, 45, 90, and 180 so i thought it was 90 or 180

Answer 14

Ok cool, I think that makes sense :) we are upon agreement, but in any case could you post the right answer when you're done this problem, I'm still skeptical.

Answer 15

I would, but it's a project and doesn't tell me if it's right or wrong Im sorry.

Answer 16

there was another question

Answer 17

Use your answer from the previous question to estimate the length of time that the camera’s shutter was open. The shutter was open for ____ hours. (Round your answer to the nearest hour and enter only the number.)

Answer 18

If the shutter is open for 24 hours, the stars appear to make one complete rotation around Polaris.

Answer 19

No worries, so 360 is 24 hours, so all we have to do is \[\frac{ 90 }{ 360 } = ...\]

Answer 20

You just have to convert it in hours, that shouldn't be too bad

Answer 21

ohhh wow thats pretty easy just overthinking it thank you. Convert it from min to hours correct?

Answer 22

Im sorry thank you I appreciate the help

Answer 23

\[\frac{ 90 }{ 360 } = 0.25\] that means it's 25% of 24 hours, so now just multiply by 24 to get the answer in hours, 0.25(24).

Answer 24

No problem!

Answer 25

to get 6

Answer 26

Perfect

Answer 27

thank you :)

Answer 28

Your welcome :)