Duracell batteries are an example of an electrochemical cell that is powered between the reaction of Magnesium and Zinc, occurring in basic conditions (alkaline battery). This type of reaction has a precise output of 1.5 volts, and looks like this:
Zn + 2MnO2 ➡️ ZnO + Mn2O3
It’s not rechargeable.
Golf Cart Batteries are an example of an electrochemical cell that is powered by the reaction between Lead and Sulfuric Acid (Lead-Acid battery). This type of reaction occurs on larger scales than an alkaline battery, and thus can generate a variety of powers depending on how many instruments are present within the battery. The reaction looks like this:
PbO2 + Pb + 2H2SO4 ➡️ 2PbSO4 + H2O
This is a rechargeable cell, but is rather prone to discharging by the environment and surroundings of the battery.
Answer:
1.97 seconds
Explanation:
t = Time taken
u = Initial velocity
v = Final velocity
s = Displacement
a = Acceleration due to gravity = 9.8 m/s²
![s=ut+\frac{1}{2}at^2\\\Rightarrow 21=4.5t+\frac{1}{2}\times -9.8\times t^2\\\Rightarrow 21=-4.5t-4.9t^2\\\Rightarrow 4.9t^2+4.5t-28=0\\\Rightarrow 49t^2+45t-280=0](https://tex.z-dn.net/?f=s%3Dut%2B%5Cfrac%7B1%7D%7B2%7Dat%5E2%5C%5C%5CRightarrow%2021%3D4.5t%2B%5Cfrac%7B1%7D%7B2%7D%5Ctimes%20-9.8%5Ctimes%20t%5E2%5C%5C%5CRightarrow%2021%3D-4.5t-4.9t%5E2%5C%5C%5CRightarrow%204.9t%5E2%2B4.5t-28%3D0%5C%5C%5CRightarrow%2049t%5E2%2B45t-280%3D0)
Solving the above equation we get
![t=\frac{-45+\sqrt{45^2-4\cdot \:49\left(-280\right)}}{2\cdot \:49}, \frac{-45-\sqrt{45^2-4\cdot \:49\left(-280\right)}}{2\cdot \:49}\\\Rightarrow t=1.97, -2.89](https://tex.z-dn.net/?f=t%3D%5Cfrac%7B-45%2B%5Csqrt%7B45%5E2-4%5Ccdot%20%5C%3A49%5Cleft%28-280%5Cright%29%7D%7D%7B2%5Ccdot%20%5C%3A49%7D%2C%20%5Cfrac%7B-45-%5Csqrt%7B45%5E2-4%5Ccdot%20%5C%3A49%5Cleft%28-280%5Cright%29%7D%7D%7B2%5Ccdot%20%5C%3A49%7D%5C%5C%5CRightarrow%20t%3D1.97%2C%20-2.89)
So, the time the package was in the air is 1.97 seconds
Answer:
.067 so C
Explanation:
I asked my sister who is in 2nd grade and she said it was right so you are good! =). have a great day!
Answer:
![r =3 *\sqrt{2} = 4.24 cm](https://tex.z-dn.net/?f=r%20%3D3%20%2A%5Csqrt%7B2%7D%20%3D%204.24%20cm)
Explanation:
given data
Radius of sphere 3.0 cm
charge Q = 2.0 m C
We know that maximum electric field is given as
![E_{MAX}= \frac{KQ}{r^{2}}](https://tex.z-dn.net/?f=E_%7BMAX%7D%3D%20%5Cfrac%7BKQ%7D%7Br%5E%7B2%7D%7D)
electric field inside the sphere can be determine by using below relation
![\frac{KQ}{r^{2}}= \frac{1}{2}*\frac{KQ}{R^{2}}](https://tex.z-dn.net/?f=%5Cfrac%7BKQ%7D%7Br%5E%7B2%7D%7D%3D%20%5Cfrac%7B1%7D%7B2%7D%2A%5Cfrac%7BKQ%7D%7BR%5E%7B2%7D%7D)
![r = \sqrt{2}R](https://tex.z-dn.net/?f=r%20%3D%20%5Csqrt%7B2%7DR)
![r =3 *\sqrt{2} = 4.24 cm](https://tex.z-dn.net/?f=r%20%3D3%20%2A%5Csqrt%7B2%7D%20%3D%204.24%20cm)