Answer:
they were hunter gatherers
Explanation:
Answer:
v = 45.37 m/s
Explanation:
Given,
angle of inclination = 8.0°
Vertical height, H = 105 m
Initial K.E. = 0 J
Initial P.E. = m g H
Final PE = 0 J
Final KE = ![\dfrac{1}{2}mv^2](https://tex.z-dn.net/?f=%20%5Cdfrac%7B1%7D%7B2%7Dmv%5E2)
Using Conservation of energy
![KE_i + PE_i + KE_f + PE_f](https://tex.z-dn.net/?f=%20KE_i%20%2B%20PE_i%20%2B%20KE_f%20%2B%20PE_f)
![0 + m g H = \dfrac{1}{2}mv^2 + 0](https://tex.z-dn.net/?f=%200%20%2B%20m%20g%20H%20%3D%20%5Cdfrac%7B1%7D%7B2%7Dmv%5E2%20%2B%200)
![v = \sqrt{2gH}](https://tex.z-dn.net/?f=v%20%3D%20%5Csqrt%7B2gH%7D)
![v = \sqrt{2\times 9.8 \times 105}](https://tex.z-dn.net/?f=v%20%3D%20%5Csqrt%7B2%5Ctimes%209.8%20%5Ctimes%20105%7D)
v = 45.37 m/s
Hence, speed of the skier at the bottom is equal to v = 45.37 m/s
Answer
given,
Pressure on the top wing = 265 m/s
speed of underneath wings = 234 m/s
mass of the airplane = 7.2 × 10³ kg
density of air = 1.29 kg/m³
using Bernoulli's equation
![P_1 + \dfrac{1}{2}\rho v_1^2 = P_2 + \dfrac{1}{2}\rho v_2^2](https://tex.z-dn.net/?f=P_1%20%2B%20%5Cdfrac%7B1%7D%7B2%7D%5Crho%20v_1%5E2%20%3D%20P_2%20%2B%20%5Cdfrac%7B1%7D%7B2%7D%5Crho%20v_2%5E2)
![\Delta P =\dfrac{1}{2}\rho (v_2^2-v_1^2)](https://tex.z-dn.net/?f=%5CDelta%20P%20%3D%5Cdfrac%7B1%7D%7B2%7D%5Crho%20%28v_2%5E2-v_1%5E2%29)
![\Delta P =\dfrac{1}{2}\times 1.29\times (265^2-234^2)](https://tex.z-dn.net/?f=%5CDelta%20P%20%3D%5Cdfrac%7B1%7D%7B2%7D%5Ctimes%201.29%5Ctimes%20%28265%5E2-234%5E2%29)
![\Delta P =9977.5 Pa](https://tex.z-dn.net/?f=%5CDelta%20P%20%3D9977.5%20Pa)
Applying newtons second law
2 Δ P x A - mg = 0
![A =\dfrac{mg}{2\Delta P}](https://tex.z-dn.net/?f=A%20%3D%5Cdfrac%7Bmg%7D%7B2%5CDelta%20P%7D)
![A =\dfrac{7.2\times 10^3 \times 9.8}{2\times 9977.5}](https://tex.z-dn.net/?f=A%20%3D%5Cdfrac%7B7.2%5Ctimes%2010%5E3%20%5Ctimes%209.8%7D%7B2%5Ctimes%209977.5%7D)
A = 3.53 m²
The answer you’re looking for is
D. Gamma rays
Enjoy the rest of your day/night :)
Grass dear wolf is the right awnser