Answer:
![x_{distance}=10.07km](https://tex.z-dn.net/?f=x_%7Bdistance%7D%3D10.07km)
Explanation:
Given data
time=0.530 h
Average velocity Vavg=19.0 km/s
To find
Displacement Δx
Solution
The Formula for average velocity is given as
![V_{avg}=(x_{distance} )/(t_{time} )\\ x_{distance}=V_{avg}*(t_{time} )\\x_{distance}=(19.0km/h)*(0.530h)\\x_{distance}=10.07km](https://tex.z-dn.net/?f=V_%7Bavg%7D%3D%28x_%7Bdistance%7D%20%29%2F%28t_%7Btime%7D%20%29%5C%5C%20x_%7Bdistance%7D%3DV_%7Bavg%7D%2A%28t_%7Btime%7D%20%29%5C%5Cx_%7Bdistance%7D%3D%2819.0km%2Fh%29%2A%280.530h%29%5C%5Cx_%7Bdistance%7D%3D10.07km)
Answer: a) 8.2 * 10^-8 N or 82 nN and b) is repulsive
Explanation: To solve this problem we have to use the Coulomb force for two point charged, it is given by:
![F=\frac{k*q1*q2}{d^{2}}](https://tex.z-dn.net/?f=F%3D%5Cfrac%7Bk%2Aq1%2Aq2%7D%7Bd%5E%7B2%7D%7D)
Replacing the dat we obtain F=82 nN.
The force is repulsive because the points charged have the same sign.
Answer:
![T = 40.501\,^{\textdegree}C](https://tex.z-dn.net/?f=T%20%3D%2040.501%5C%2C%5E%7B%5Ctextdegree%7DC)
Explanation:
The interaction of the piece of copper and water means that the first one need to transfer heat in order to reach a thermal equilibrium with water. Then:
![-Q_{out,Cu} = Q_{in,H_{2}O}](https://tex.z-dn.net/?f=-Q_%7Bout%2CCu%7D%20%3D%20Q_%7Bin%2CH_%7B2%7DO%7D)
After a quick substitution, the expanded expression is:
![-(43.9\,g)\cdot (0.385\,\frac{J}{g\cdot ^{\textdegree}C} )\cdot (T-135^{\textdegree}C) = (254\,g)\cdot (4.187\,\frac{J}{g\cdot ^{\textdegree}C} )\cdot (T-39\,^{\textdegree}C)](https://tex.z-dn.net/?f=-%2843.9%5C%2Cg%29%5Ccdot%20%280.385%5C%2C%5Cfrac%7BJ%7D%7Bg%5Ccdot%20%5E%7B%5Ctextdegree%7DC%7D%20%29%5Ccdot%20%28T-135%5E%7B%5Ctextdegree%7DC%29%20%3D%20%28254%5C%2Cg%29%5Ccdot%20%284.187%5C%2C%5Cfrac%7BJ%7D%7Bg%5Ccdot%20%5E%7B%5Ctextdegree%7DC%7D%20%29%5Ccdot%20%28T-39%5C%2C%5E%7B%5Ctextdegree%7DC%29)
![-16.902\,\frac{J}{^{\textdegree}C}\cdot (T-135^{\textdegree}C) = 1063.498\,\frac{J}{^{\textdegree}C} \cdot (T-39^{\textdegree}C)](https://tex.z-dn.net/?f=-16.902%5C%2C%5Cfrac%7BJ%7D%7B%5E%7B%5Ctextdegree%7DC%7D%5Ccdot%20%28T-135%5E%7B%5Ctextdegree%7DC%29%20%3D%201063.498%5C%2C%5Cfrac%7BJ%7D%7B%5E%7B%5Ctextdegree%7DC%7D%20%5Ccdot%20%20%28T-39%5E%7B%5Ctextdegree%7DC%29)
![43758,192\,J = 1080.4\,\frac{J}{^{\textdegree}C}\cdot T](https://tex.z-dn.net/?f=43758%2C192%5C%2CJ%20%3D%201080.4%5C%2C%5Cfrac%7BJ%7D%7B%5E%7B%5Ctextdegree%7DC%7D%5Ccdot%20T)
The final temperature of the system is:
![T = 40.501\,^{\textdegree}C](https://tex.z-dn.net/?f=T%20%3D%2040.501%5C%2C%5E%7B%5Ctextdegree%7DC)
Answer:
80m<em>/</em><em>s</em>
Explanation:
Final velocity is given by
v=u+at
when a motorcyclist starts from rest, initial velocity (u) =0
therefore
v=0+4*20
v=80m/s
that's the answer
Answer:
a) transparent
b) transparent
c) opaque
Explanation:
In the first one, the light rays go completely through, so it is transparent.
The second one I'm not too sure about. It is refraction so it's going through a different material, but the fact that it went through makes me say transparent.
Last one, the light rays are reflecting off the surface so it's opaque.
Please feel free to correct me if I'm wrong. This is just my understanding