The top of the trajectory is the point where it changes from rising to falling. At that exact instant, its vertical speed is zero.
Answer:
i.4.4m/s
ii.5.8m/s
III.5.98m/s
Explanation:
Given Y=70t-16t^2 at t=2
Y= 70(2)-16(2)^2=76m/s
i.at 0.1sec=2.1secs
Y=70(2.1)-16(2.1)^2=76.44m/s
Velocity (76.44-76/.1)=4.4m/s
ii.at t=0.01secs
Y=70(2.01)-16(2.01)^2=76.058m/s
Velocity=(76.056-76/.01)=5.8m/s
ii.at t=0.001
Y=70(2.001)-16(2.001)^2=76.0059m/s
Velocity=(76.0059-76/.001)=5.98m/s
Answer:
6755727gvbu7euyeue77377365353663636
Explanation:
ghfjfkjfjfn has a long way is a good relationship is a different person than the difference is that the answer is 8AM is a good relationship with the other 4AM in a certain way is a different type and have different effects and feelings and the difference is the difference is that you can do it for a long period and the same way you know what to smome but you can get to the claire family a lot of times and the difference between the two is that the person you want and you know it would have different opinions on the subject and then use the difference between the two and a half hour and the difference is that the answer is yes but if you're not going anywhere in the past two and your life you can do that with your 6 or an 6th year old girl who is a good things go to
Answer:
Wavelength is calculated as 213.9 nm
Solution:
As per the question:
Wavelength of light = 570 nm
Time, t = 16.5 ns
Thickness of glass slab, d = 0.865 ns
Time taken to travel from laser to the photocell, t' = 21.3
Speed of light in vacuum, c = ![3\times 10^{8}\ m/s](https://tex.z-dn.net/?f=3%5Ctimes%2010%5E%7B8%7D%5C%20m%2Fs)
Now,
To calculate the wavelength of light inside the glass:
After the insertion of the glass slab into the beam, the extra time taken by light to cover a thickness t = 0.865 m is:
t' - t = 21.3 - 16.5 = 4.8 ns
Thus
![\frac{d}{\frac{c}{n}} - \frac{d}{v} = 4.8\times 10^{- 9}](https://tex.z-dn.net/?f=%5Cfrac%7Bd%7D%7B%5Cfrac%7Bc%7D%7Bn%7D%7D%20-%20%5Cfrac%7Bd%7D%7Bv%7D%20%3D%204.8%5Ctimes%2010%5E%7B-%209%7D)
![\frac{0.8656}{\frac{c}{n}} - \frac{0.865}{v} = 4.8\times 10^{- 9}](https://tex.z-dn.net/?f=%5Cfrac%7B0.8656%7D%7B%5Cfrac%7Bc%7D%7Bn%7D%7D%20-%20%5Cfrac%7B0.865%7D%7Bv%7D%20%3D%204.8%5Ctimes%2010%5E%7B-%209%7D)
where
n = refractive index of the medium
v = speed of light in medium
![\frac{0.8656}{\frac{c}{n}} - \frac{0.865}{v} = 4.8\times 10^{- 9}](https://tex.z-dn.net/?f=%5Cfrac%7B0.8656%7D%7B%5Cfrac%7Bc%7D%7Bn%7D%7D%20-%20%5Cfrac%7B0.865%7D%7Bv%7D%20%3D%204.8%5Ctimes%2010%5E%7B-%209%7D)
![n = \frac{4.8\times 10^{- 9}\times 3.00\times 10^{8}}{0.865} + 1](https://tex.z-dn.net/?f=n%20%3D%20%5Cfrac%7B4.8%5Ctimes%2010%5E%7B-%209%7D%5Ctimes%203.00%5Ctimes%2010%5E%7B8%7D%7D%7B0.865%7D%20%2B%201)
n = 2.66
Now,
The wavelength in the glass:
![\lambda' = \frac{\lambda }{n}](https://tex.z-dn.net/?f=%5Clambda%27%20%3D%20%5Cfrac%7B%5Clambda%20%7D%7Bn%7D)
![\lambda' = \frac{570}{2.66} = 213.9\ nm](https://tex.z-dn.net/?f=%5Clambda%27%20%3D%20%5Cfrac%7B570%7D%7B2.66%7D%20%3D%20213.9%5C%20nm)
Definition near the outside