<span>Displacement is the difference between the initial position and the FINAL position of an object.
Hope this helps!</span>
Answer:
The further the distance from the pivot the greater the force
Explanation:
Practical example below
Distance of door handle is 5m. Force is 5N
Moment = Force × distance
=5×5
=25Nm
Distance of door handle is 7m. Force is 5N
= 7×5
=35Nm
Therefore proven correct
Gravity obeys the inverse square law. At 6400 km above the center of the Earth (Earth's surface) you weigh x. Twice that reduces your weight to 1/4th. Four times that height reduces your weight to 1/16th. 4 times 6400 km is 25,600 km. But that is above the center of the earth, and the question requests the height above the surface, so we deduct 6400 km to arrive at our final answer: 19,200 km.
Incidentally, it doesn't exactly work the opposite way. At the center of the Earth the mass would be equally distributed around you, and you would therefore be weightless.
Answer:
a) ![\frac{\dot Q}{A} =60\ W.m^{-2}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Cdot%20Q%7D%7BA%7D%20%3D60%5C%20W.m%5E%7B-2%7D)
b) ![\frac{\dot Q}{A} =110\ W.m^{-2}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Cdot%20Q%7D%7BA%7D%20%3D110%5C%20W.m%5E%7B-2%7D)
c) The wall may not be under steady because the two surfaces of the wall are exposed to the air at different temperatures and they have different convective coefficient.
Explanation:
Given:
- temperature of the inner surface of the wall,
![T_i=25^{\circ}C](https://tex.z-dn.net/?f=T_i%3D25%5E%7B%5Ccirc%7DC)
- temperature of the outer surface of the wall,
![T_o=8^{\circ}C](https://tex.z-dn.net/?f=T_o%3D8%5E%7B%5Ccirc%7DC)
- temperature of the air outside,
![T_{ao}=-3^{\circ}C](https://tex.z-dn.net/?f=T_%7Bao%7D%3D-3%5E%7B%5Ccirc%7DC)
- temperature of the air inside,
![T_{ai}=35^{\circ}C](https://tex.z-dn.net/?f=T_%7Bai%7D%3D35%5E%7B%5Ccirc%7DC)
- coefficient of heat convection on outside,
![h_o=10\ W.m^{-2}.K^{-1}](https://tex.z-dn.net/?f=h_o%3D10%5C%20W.m%5E%7B-2%7D.K%5E%7B-1%7D)
- coefficient of heat convection on inside,
![h_i=6\ W.m^{-2}.K^{-1}](https://tex.z-dn.net/?f=h_i%3D6%5C%20W.m%5E%7B-2%7D.K%5E%7B-1%7D)
a)
The heat flux between the interior air and the wall:
The convective heat transfer rate is given as,
![Q=h_i.A.\Delta T](https://tex.z-dn.net/?f=Q%3Dh_i.A.%5CDelta%20T)
![\Rightarrow \frac{\dot Q}{A} =h_i\times (T_{ai}-T_i)](https://tex.z-dn.net/?f=%5CRightarrow%20%5Cfrac%7B%5Cdot%20Q%7D%7BA%7D%20%3Dh_i%5Ctimes%20%28T_%7Bai%7D-T_i%29)
![\frac{\dot Q}{A} =6\times (35-25)](https://tex.z-dn.net/?f=%5Cfrac%7B%5Cdot%20Q%7D%7BA%7D%20%3D6%5Ctimes%20%2835-25%29)
![\frac{\dot Q}{A} =60\ W.m^{-2}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Cdot%20Q%7D%7BA%7D%20%3D60%5C%20W.m%5E%7B-2%7D)
b)
The heat flux between the exterior air and the wall:
![\Rightarrow \frac{\dot Q}{A} =h_o\times (T_{ao}-T_i)](https://tex.z-dn.net/?f=%5CRightarrow%20%5Cfrac%7B%5Cdot%20Q%7D%7BA%7D%20%3Dh_o%5Ctimes%20%28T_%7Bao%7D-T_i%29)
![\frac{\dot Q}{A}=10\times (8-(-3))](https://tex.z-dn.net/?f=%5Cfrac%7B%5Cdot%20Q%7D%7BA%7D%3D10%5Ctimes%20%288-%28-3%29%29)
![\frac{\dot Q}{A} =110\ W.m^{-2}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Cdot%20Q%7D%7BA%7D%20%3D110%5C%20W.m%5E%7B-2%7D)
c)
The wall may not be under steady because the two surfaces of the wall are exposed to the air at different temperatures and they have different convective coefficient.
Answer:
A wave can be described as a disturbance that travels through a medium from one location to another location.
Explanation: