Answer:
There are different kinds of insulation (electrical, thermal, etc.), but I'm assuming you mean thermal insulation.
Insulation should be as thick as practicable because the thicker the insulation is, the less heat loss there is.
Answer:
Incomplete question: "Each block has a mass of 0.2 kg"
The speed of the two-block system's center of mass just before the blocks collide is 2.9489 m/s
Explanation:
Given data:
θ = angle of the surface = 37°
m = mass of each block = 0.2 kg
v = speed = 0.35 m/s
t = time to collision = 0.5 s
Question: What is the speed of the two-block system's center of mass just before the blocks collide, vf = ?
Change in momentum:
![delta(P)=F*delta(t)](https://tex.z-dn.net/?f=delta%28P%29%3DF%2Adelta%28t%29)
![P_{f} -P_{i}=F*delta(t)](https://tex.z-dn.net/?f=P_%7Bf%7D%20-P_%7Bi%7D%3DF%2Adelta%28t%29)
![2m(v_{f} -v_{i})=F*delta(t)](https://tex.z-dn.net/?f=2m%28v_%7Bf%7D%20-v_%7Bi%7D%29%3DF%2Adelta%28t%29)
![v_{i} =0.35-0.35=0](https://tex.z-dn.net/?f=v_%7Bi%7D%20%3D0.35-0.35%3D0)
It is neccesary calculate the force:
![F=(m+m)*g*sin\theta](https://tex.z-dn.net/?f=F%3D%28m%2Bm%29%2Ag%2Asin%5Ctheta)
Here, g = gravity = 9.8 m/s²
![F=(0.2+0.2)*9.8*sin37=2.3591N](https://tex.z-dn.net/?f=F%3D%280.2%2B0.2%29%2A9.8%2Asin37%3D2.3591N)
![v_{f} =\frac{F*delta(t)}{2m} =\frac{2.3591*0.5}{2*0.2} =2.9489m/s](https://tex.z-dn.net/?f=v_%7Bf%7D%20%3D%5Cfrac%7BF%2Adelta%28t%29%7D%7B2m%7D%20%3D%5Cfrac%7B2.3591%2A0.5%7D%7B2%2A0.2%7D%20%3D2.9489m%2Fs)
Lightning is an electric current. Within a thundercloud way up in the sky, many small bits of ice (frozen raindrops) bump into each other as they move around in the air. All of those collisions create an electric charge. After a while, the whole cloud fills up with electrical charger
Answer:
All trenches must have access/egress - A.