Answer:
![W=\frac{773}{4.45}=173.76 l b f](https://tex.z-dn.net/?f=W%3D%5Cfrac%7B773%7D%7B4.45%7D%3D173.76%20l%20b%20f)
Explanation:
![W=\frac{G \cdot m_{e} \cdot m}{(R+h)^{2}}](https://tex.z-dn.net/?f=W%3D%5Cfrac%7BG%20%5Ccdot%20m_%7Be%7D%20%5Ccdot%20m%7D%7B%28R%2Bh%29%5E%7B2%7D%7D)
The law of gravitation
![G=6.673\left(10^{-11}\right) m^{3} /\left(k g \cdot s^{2}\right)](https://tex.z-dn.net/?f=G%3D6.673%5Cleft%2810%5E%7B-11%7D%5Cright%29%20m%5E%7B3%7D%20%2F%5Cleft%28k%20g%20%5Ccdot%20s%5E%7B2%7D%5Cright%29)
Universal gravitational constant [S.I. units]
![m_{e}=5.976\left(10^{24}\right) k g](https://tex.z-dn.net/?f=m_%7Be%7D%3D5.976%5Cleft%2810%5E%7B24%7D%5Cright%29%20k%20g)
Mass of Earth [S.I. units]
![m=89 kg](https://tex.z-dn.net/?f=m%3D89%20kg)
Mass of a man in a spacecraft [S.I. units]
![R=6371 \mathrm{~km}](https://tex.z-dn.net/?f=R%3D6371%20%5Cmathrm%7B~km%7D)
Earth radius [km]
Distance between man and the earth's surface
![h=261 \mathrm{~km} \quad[\mathrm{~km}]](https://tex.z-dn.net/?f=h%3D261%20%5Cmathrm%7B~km%7D%20%5Cquad%5B%5Cmathrm%7B~km%7D%5D)
ESULT ![W=\frac{6.673\left(10^{-11}\right) \cdot 5.976\left(10^{24}\right) \cdot 89}{\left(6371 \cdot 10^{3}+261 \cdot 10^{3}\right)^{2}}=773.22 \mathrm{~N}](https://tex.z-dn.net/?f=W%3D%5Cfrac%7B6.673%5Cleft%2810%5E%7B-11%7D%5Cright%29%20%5Ccdot%205.976%5Cleft%2810%5E%7B24%7D%5Cright%29%20%5Ccdot%2089%7D%7B%5Cleft%286371%20%5Ccdot%2010%5E%7B3%7D%2B261%20%5Ccdot%2010%5E%7B3%7D%5Cright%29%5E%7B2%7D%7D%3D773.22%20%5Cmathrm%7B~N%7D)
![W=\frac{773}{4.45}=173.76 l b f](https://tex.z-dn.net/?f=W%3D%5Cfrac%7B773%7D%7B4.45%7D%3D173.76%20l%20b%20f)
Answer:
220 ohms
Explanation:
I = V / R
0.25 = 110 / R
R = 110 / 0.25
R = 440 ohms
Equivalent resistance = 440 ohms
Resistance of single light bulb = Equivalent resistance / number of bulbs
= 440 / 2
= 220 ohms
Answer:
hydrogen
helium
oxygen
Explanation:
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The free-body diagram of an apple falling through the air has weight of the apple pointing downwards and the air-resistance on the apple acting upwards.
When an object falls from up to the ground, the object falls under in the influence of acceleration due to gravity.
The vertical component of the force on the apple as it falls trough the air is given as;
∑Fy = 0
Fₙ - W = 0
Fₙ = W
where;
- <em>Fₙ is the frictional force on the apple acting upwards</em>
- <em>W is the weight of the apple acting downwards</em>
The free-body diagram of the apple is represented as follows;
↑ Fₙ
Ο
↓ W
Thus, the free-body diagram of an apple falling through the air has weight of the apple pointing downwards and the air-resistance on the apple acting upwards.
Learn more here:brainly.com/question/18770265
Answer:
The smallest separation distance between the speakers is 0.71 m.
Explanation:
Given that,
Two speakers, one directly behind the other, are each generating a 240-Hz sound wave, f = 240 Hz
Let the speed of sound is 343 m/s in air. The speed of sound is given by the formula as :
![v=f\lambda\\\\\lambda=\dfrac{v}{f}\\\\\lambda=\dfrac{343\ m/s}{240\ Hz}\\\\\lambda=1.42\ m](https://tex.z-dn.net/?f=v%3Df%5Clambda%5C%5C%5C%5C%5Clambda%3D%5Cdfrac%7Bv%7D%7Bf%7D%5C%5C%5C%5C%5Clambda%3D%5Cdfrac%7B343%5C%20m%2Fs%7D%7B240%5C%20Hz%7D%5C%5C%5C%5C%5Clambda%3D1.42%5C%20m)
To produce destructive interference at a listener standing in front of them,
![d=\dfrac{\lambda}{2}\\\\d=\dfrac{1.42}{2}\\\\d=0.71\ m](https://tex.z-dn.net/?f=d%3D%5Cdfrac%7B%5Clambda%7D%7B2%7D%5C%5C%5C%5Cd%3D%5Cdfrac%7B1.42%7D%7B2%7D%5C%5C%5C%5Cd%3D0.71%5C%20m)
So, the smallest separation distance between the speakers is 0.71 m. Hence, this is the required solution.