Answer:
In a voltaic cell, current is produced by connecting an oxidation reaction half cell to a reduction reaction half cell in an electrolyte solution. Oxidation and reduction reactions (redox reactions) are chemical reactions involving a transfer of electrons from one atom in the reaction to another. When two different oxidation or reduction reactions are connected electrically by connecting the cathode to the anode, a current is formed. The direction depends on the type of reaction taking place at the terminal.
The first step would be to determine metals to be used as the cathode and the anode.
Explanation:
The force between two charges is given by :
![F=\dfrac{kq_1q_2}{r^2}](https://tex.z-dn.net/?f=F%3D%5Cdfrac%7Bkq_1q_2%7D%7Br%5E2%7D)
k is electrostatic constant
r is distance between charges
The force between charges is directly proportional to the product of charges and inversely proportional to the square of the distance between them.
Gravity is the force of attraction between objects. Gravity is that force of attraction that will cause hydrogen gas in a nebula to clump together overtime. These hydrogen atoms will form a spinning cloud of gas within the nebula.
As collisions between the atoms become more frequent, the temperature within the cloud will rise.
As the cloud gets more massive the greater the force of gravity will be and so it will attract even more gas to the spinning cloud. When the temperature reaches fifteen million degrees Celsius, nuclear fission begins and a star is born.
Answer:
A) 200 j
B) 0 J
C) -100 J
D) -300 J
Explanation:
We know that change in potential energy is given as
![\Delta U = U_f - U_i = mgy_f - mgy_i](https://tex.z-dn.net/?f=%5CDelta%20U%20%3D%20%20U_f%20-%20U_i%20%3D%20mgy_f%20-%20mgy_i)
where, mg is weight
yf and yi final and initial position
mg = 10 N
yf = 0 m
yi = 20 m
![\Delta U = 10\times 20 - 0 = 200 J](https://tex.z-dn.net/?f=%5CDelta%20U%20%3D%2010%5Ctimes%2020%20-%200%20%3D%20200%20J)
B) mg = 10 N
yf = 20 m
yi = 20 m
![\Delta U = 0 j](https://tex.z-dn.net/?f=%5CDelta%20U%20%3D%20%200%20j)
c) before fall from the drone
U = mgh
h = yf - yi = 20 - 30 = -10 m
![U = 10\times (-10) = -100 J](https://tex.z-dn.net/?f=U%20%3D%2010%5Ctimes%20%28-10%29%20%3D%20-100%20J)
D) point has 0 potential energy
mg = 10 N
h = yf -yi = 0 -30 = - 30 m
![U = 10 \times (-30) = -300 J](https://tex.z-dn.net/?f=U%20%3D%2010%20%5Ctimes%20%28-30%29%20%3D%20-300%20J)