Answer:
v=115 m/s
or
v=414 km/h
Explanation:
Given data
![A_{area}=0.140m^{2}\\ p_{air}=1.21 kg/m^{3}\\ m_{mass}=80kg](https://tex.z-dn.net/?f=A_%7Barea%7D%3D0.140m%5E%7B2%7D%5C%5C%20%20p_%7Bair%7D%3D1.21%20kg%2Fm%5E%7B3%7D%5C%5C%20%20m_%7Bmass%7D%3D80kg)
To find
Terminal velocity (in meters per second and kilometers per hour)
Solution
At terminal speed the weight equal the drag force
![mg=1/2*C*p_{air}*v^{2}*A_{area}\\ v=\sqrt{\frac{2*m*g}{C**p_{air}*A_{area}} }\\ Where C=0.7\\v=\sqrt{\frac{2*9.8*80}{1.21*0.14*0.7} }\\ v=115m/s](https://tex.z-dn.net/?f=mg%3D1%2F2%2AC%2Ap_%7Bair%7D%2Av%5E%7B2%7D%2AA_%7Barea%7D%5C%5C%20%20%20v%3D%5Csqrt%7B%5Cfrac%7B2%2Am%2Ag%7D%7BC%2A%2Ap_%7Bair%7D%2AA_%7Barea%7D%7D%20%7D%5C%5C%20Where%20C%3D0.7%5C%5Cv%3D%5Csqrt%7B%5Cfrac%7B2%2A9.8%2A80%7D%7B1.21%2A0.14%2A0.7%7D%20%7D%5C%5C%20v%3D115m%2Fs)
For speed in km/h(kilometers per hour)
To convert m/s to km/h you need to multiply the speed value by 3.6
Answer:
![0.293I_0](https://tex.z-dn.net/?f=0.293I_0)
Explanation:
When the unpolarized light passes through the first polarizer, only the component of the light parallel to the axis of the polarizer passes through.
Therefore, after the first polarizer, the intensity of light passing through it is halved, so the intensity after the first polarizer is:
![I_1=\frac{I_0}{2}](https://tex.z-dn.net/?f=I_1%3D%5Cfrac%7BI_0%7D%7B2%7D)
Then, the light passes through the second polarizer. In this case, the intensity of the light passing through the 2nd polarizer is given by Malus' law:
![I_2=I_1 cos^2 \theta](https://tex.z-dn.net/?f=I_2%3DI_1%20cos%5E2%20%5Ctheta)
where
is the angle between the axes of the two polarizer
Here we have
![\theta=40^{\circ}](https://tex.z-dn.net/?f=%5Ctheta%3D40%5E%7B%5Ccirc%7D)
So the intensity after the 2nd polarizer is
![I_2=I_1 (cos 40^{\circ})^2=0.587I_1](https://tex.z-dn.net/?f=I_2%3DI_1%20%28cos%2040%5E%7B%5Ccirc%7D%29%5E2%3D0.587I_1)
And substituting the expression for I1, we find:
![I_2=0.587 (\frac{I_0}{2})=0.293I_0](https://tex.z-dn.net/?f=I_2%3D0.587%20%28%5Cfrac%7BI_0%7D%7B2%7D%29%3D0.293I_0)
Answer:the witch has nothing to do with the problem
Explanation:
Answer:
La posición en la que se encuentra el móvil en el instante t = 30 s es 172 m.
Explanation:
El movimiento rectilíneo uniforme (MRU) es el movimiento que describe un cuerpo o partícula a través de una línea recta a velocidad constante.
La distancia recorrida, x
, por un móvil que tiene un MRU con un velocidad v durante el intervalo de tiempo t es:
x= x0 + v*t
donde x0 es la posición inicial.
En este caso:
Reemplazando:
x= 22 m + 5 m/s* 30 s
Resolviendo:
x= 22 m + 150 m
x= 172 m
<u><em>La posición en la que se encuentra el móvil en el instante t = 30 s es 172 m.</em></u>