The correct answer is A. Most reactive non metals.
Firstly if some one knows how to read the periodic table he would have no confusion in deciding whether group 7 has metals or non metals. Group 7 contains non metals so basically we can easily cancel out two options of metals.
Secondly group 7 non metals are the most reactive non metals as they need only one electron in order to complete their valence shell and become stable.
Answer:
1964.8 J
![5.12894\times 10^{-6}\ m^3](https://tex.z-dn.net/?f=5.12894%5Ctimes%2010%5E%7B-6%7D%5C%20m%5E3)
1150 Joules
Explanation:
m = Mass of bullet = 0.5 kg
= Change in temperature = (327-20)
c = Specific heat of lead = 128 J/kg °C
= ![84\times 10^{-6}\ /^{\circ}C](https://tex.z-dn.net/?f=84%5Ctimes%2010%5E%7B-6%7D%5C%20%2F%5E%7B%5Ccirc%7DC)
= Latent heat of fusion of lead = ![23000\ J/kg^{\circ}C](https://tex.z-dn.net/?f=23000%5C%20J%2Fkg%5E%7B%5Ccirc%7DC)
(Values taken from properties of lead table)
Heat is given by
![Q=mc\Delta T\\\Rightarrow Q=0.05\times 128\times (327-20)\\\Rightarrow Q=1964.8\ J](https://tex.z-dn.net/?f=Q%3Dmc%5CDelta%20T%5C%5C%5CRightarrow%20Q%3D0.05%5Ctimes%20128%5Ctimes%20%28327-20%29%5C%5C%5CRightarrow%20Q%3D1964.8%5C%20J)
The heat needed to raise the bullet to its final temperature is 1964.8 J
Change in volume is given by
![\Delta V=V_0\beta \Delta T\\\Rightarrow \Delta V=5\times 10^{-6}\times 84\times 10^{-6}\times (327-20)\\\Rightarrow \Delta V=1.2894\times 10^{-7}\ m^3](https://tex.z-dn.net/?f=%5CDelta%20V%3DV_0%5Cbeta%20%5CDelta%20T%5C%5C%5CRightarrow%20%5CDelta%20V%3D5%5Ctimes%2010%5E%7B-6%7D%5Ctimes%2084%5Ctimes%2010%5E%7B-6%7D%5Ctimes%20%28327-20%29%5C%5C%5CRightarrow%20%5CDelta%20V%3D1.2894%5Ctimes%2010%5E%7B-7%7D%5C%20m%5E3)
![V=V_0+\Delta V\\\Rightarrow V=5\times 10^{-6}+1.2894\times 10^{-7}\\\Rightarrow V=5.12894\times 10^{-6}\ m^3](https://tex.z-dn.net/?f=V%3DV_0%2B%5CDelta%20V%5C%5C%5CRightarrow%20V%3D5%5Ctimes%2010%5E%7B-6%7D%2B1.2894%5Ctimes%2010%5E%7B-7%7D%5C%5C%5CRightarrow%20V%3D5.12894%5Ctimes%2010%5E%7B-6%7D%5C%20m%5E3)
The volume of the bullet when it comes to rest is ![5.12894\times 10^{-6}\ m^3](https://tex.z-dn.net/?f=5.12894%5Ctimes%2010%5E%7B-6%7D%5C%20m%5E3)
Heat needed for melting
![Q=mL_f\\\Rightarrow Q=0.05\times 23\times 10^3\\\Rightarrow Q=1150\ J](https://tex.z-dn.net/?f=Q%3DmL_f%5C%5C%5CRightarrow%20Q%3D0.05%5Ctimes%2023%5Ctimes%2010%5E3%5C%5C%5CRightarrow%20Q%3D1150%5C%20J)
The additional heat needed to melt the bullet is 1150 Joules
Answer:
To increase the volume of moving water, impoundments or dams are used to collect the water. An opening in the dam uses gravity to drop water down a pipe called a penstock. The moving water causes the turbine to spin, which causes magnets inside a generator to rotate and create electricity.
_Award brainliest if helped!
Force is a vector, A. Magnitude and Direction.
An unconformity, or abnormality in the layers of rocks, signifies that the process of layering was somehow interrupted. The only feasible choice for this would be (B), where erosion would have interrupted the layering process.