Answer:
Explanation:
Use the one-dimensional equation
Δx =
where delta x is the displacement of the object, v0 is the velocity of the object, a is the pull of gravity, and t is the time in seconds. That's our unknown.
Δx = -2 (negative because where it ends up is lower than the point at which it started),
, and
a = -9.8
Filling in:
and simplified a bit:
![-2=5t-4.9 t^2](https://tex.z-dn.net/?f=-2%3D5t-4.9%20t%5E2)
this should look hauntingly familiar (a quadratic, which is parabolic motion...very important in physics!!). We begin by getting everything on one side of the equals sign and solving for t by factoring:
(the 0 is also indicative of the object landing on the ground! Isn't this a beautiful thing, how it all just works so perfectly together?)
When you factor this however your math/physics teacher has you factoring you will get that
t = 1.3 sec and t = -.31 sec
Since we all know that time can NEVER be negative, it takes the ball 1.3 sec to hit the ground from a height of 2 m if it is rolling off the shelf at 5 m/s.
It means that if you had a cubic meter of water it would weigh 1000 kilograms
Answer:
(a). Index of refraction are
= 1.344 &
= 1.406
(b). The velocity of red light in the glass
2.23 ×![10^{8} \ \frac{m}{s}](https://tex.z-dn.net/?f=10%5E%7B8%7D%20%5C%20%5Cfrac%7Bm%7D%7Bs%7D)
The velocity of violet light in the glass
2.13 ×![10^{8} \ \frac{m}{s}](https://tex.z-dn.net/?f=10%5E%7B8%7D%20%5C%20%5Cfrac%7Bm%7D%7Bs%7D)
Explanation:
We know that
Law of reflection is
![n_1 \sin\theta_{1} = n_2 \sin\theta_{2}](https://tex.z-dn.net/?f=n_1%20%5Csin%5Ctheta_%7B1%7D%20%3D%20n_2%20%5Csin%5Ctheta_%7B2%7D)
Here
= angle of incidence
= angle of refraction
(a). For red light
1 ×
=
× ![\sin 38.4](https://tex.z-dn.net/?f=%5Csin%2038.4)
= 1.344
For violet light
1 ×
=
× ![\sin 36.4](https://tex.z-dn.net/?f=%5Csin%2036.4)
= 1.406
(b). Index of refraction is given by
![n = \frac{c}{v}](https://tex.z-dn.net/?f=n%20%3D%20%5Cfrac%7Bc%7D%7Bv%7D)
= 1.344
![v_{red} = \frac{c}{n_{red} }](https://tex.z-dn.net/?f=v_%7Bred%7D%20%3D%20%5Cfrac%7Bc%7D%7Bn_%7Bred%7D%20%7D)
![v_{red} = \frac{3(10^{8} )}{1.344}](https://tex.z-dn.net/?f=v_%7Bred%7D%20%3D%20%5Cfrac%7B3%2810%5E%7B8%7D%20%29%7D%7B1.344%7D)
2.23 ×![10^{8} \ \frac{m}{s}](https://tex.z-dn.net/?f=10%5E%7B8%7D%20%5C%20%5Cfrac%7Bm%7D%7Bs%7D)
This is the velocity of red light in the glass.
The velocity of violet light in the glass is given by
![v_{violet} = \frac{3(10^{8} )}{1.406}](https://tex.z-dn.net/?f=v_%7Bviolet%7D%20%3D%20%5Cfrac%7B3%2810%5E%7B8%7D%20%29%7D%7B1.406%7D)
2.13 ×![10^{8} \ \frac{m}{s}](https://tex.z-dn.net/?f=10%5E%7B8%7D%20%5C%20%5Cfrac%7Bm%7D%7Bs%7D)
This is the velocity of violet light in the glass.
Answer:
The answer will be <em>D</em>
Explanation:
I choose answer <em>C</em> and got it wrong on the test. Also Liquid atoms vibrate fast and slide past each other. what answer <em>C </em>shows is a gas.