## Ruchi. 2 years ago arush sat down to study at 8 a.m. the angle of elevation of the sun was 15'.when he finished studying the angle of elevation of the sun was 55'.how long did arush study?

1. Ruchi.

@Hero @karatechopper

2. Ruchi.

plz hlp me out today is my xam PSA

3. Ruchi.

@sirm3d @onedirection822 @Weepdo-s @poopsiedoodle

4. Ruchi.

timo u r writing something were that

5. timo86m

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6. timo86m

be nice poopsie how the heck you become ambassador?

7. timo86m

set a ratio original to new time 8/x=15/55

8. timo86m

that reduces to 8/x = 3/11

9. timo86m

or i think i did it wrong

10. timo86m

11. Ruchi.

yes option is also given 40 mins, 1hrs 20mins, 2hrs 23mins, 2hrs 40 mins

12. timo86m

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13. timo86m

14. Ruchi.

no

15. timo86m

i am confused perhabs if we divide the angle 360 into a 24 hour thingy. so 360 degree= 24 hour

16. Ruchi.

nt getting

17. timo86m

ooh maybe the horizontal length is fixed and just the vertical varies.

18. timo86m

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19. Ruchi.

hw to solve nt getting

20. richyw

what latitude does he live in?

21. Ruchi.

u can read question 4 that?

22. timo86m

23. richyw

if you assume that the sun travels in an arc directly overhead then you can get the angular velocity of the sun as$\omega=\frac{180^{\circ}}{12 \text{ hours}}=15^{\circ}/\text{h}$then $\Delta t=\frac{\Delta\theta}{w}=\frac{55^{\circ}-15^{\circ}}{15^{\circ}/h}=\frac{8}{3}h=160\text{ min}$

24. richyw

but here the sun is at 15 degrees at 8 am so the time zone are a bit messed up. I guess it is plausible as long as the area is right on the edge of a time zone, but you would expect the sun to rise and set around 6am and 6 pm.