Answer:
d = 0.391 m
Explanation:
given,
mass of sled = 18 kg
inclined at an angle of = 28°
kinetic friction between the sled and inclined = 0.25
using energy equation
![\dfrac{1}{2}mv^2- Fd - mgh = 0](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7B2%7Dmv%5E2-%20Fd%20-%20mgh%20%3D%200)
![\dfrac{1}{2}mv^2- (\mu mg cos\theta )d - mgdsin\theta = 0](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7B2%7Dmv%5E2-%20%28%5Cmu%20mg%20cos%5Ctheta%20%29d%20-%20mgdsin%5Ctheta%20%3D%200)
![\dfrac{1}{2}mv^2 = (\mu mg cos\theta )d + mgdsin\theta](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7B2%7Dmv%5E2%20%3D%20%28%5Cmu%20mg%20cos%5Ctheta%20%29d%20%2B%20mgdsin%5Ctheta)
![\dfrac{1}{2}mv^2 = d mg (\mu cos\theta+sin\theta)](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7B2%7Dmv%5E2%20%3D%20d%20mg%20%28%5Cmu%20cos%5Ctheta%2Bsin%5Ctheta%29)
![d = \dfrac{v^2}{2g (\mu cos\theta+sin\theta)}](https://tex.z-dn.net/?f=d%20%3D%20%5Cdfrac%7Bv%5E2%7D%7B2g%20%28%5Cmu%20cos%5Ctheta%2Bsin%5Ctheta%29%7D)
![d = \dfrac{2.3^2}{2\times 9.8 (0.25\times cos28^0+sin28^0)}](https://tex.z-dn.net/?f=d%20%3D%20%5Cdfrac%7B2.3%5E2%7D%7B2%5Ctimes%209.8%20%280.25%5Ctimes%20cos28%5E0%2Bsin28%5E0%29%7D)
d = 0.391 m
hence, the distance traveled by the sled is equal to 0.391 m
The false statement would be :
C. constructive interference occurs when the crest of one wave overlaps the trough of another and their individual effects are reduced or cancelled out.
Constructive interference should be when the crest of one wave overlaps another and their individual effects are add up, becoming a single wave of increased amplitude<span />
Answer:
because the moon is nearer to the earth compared to the stars which we require telescopes to observe
Angle 1 . . . . . 14 parts
Angle 2 . . . . . 5 parts
Angle 3 . . . . . 11 parts
Total . . . . . . . . 30 parts
But the total of the angles in ANY triangle is always 180 degrees.
SO ... 180 degrees / 30 parts = 6 degrees per part.
Angle 1 . . . . . 14 parts x (6° / part) = 84°
Angle 2 . . . . . . 5 parts x (6° / part) = 30°
Angle 3 . . . . . 11 parts x (6° / part) = 66°
Check: Total . . . . . . . . . . . . . . . . . . 180° yay !