Answer:
THE CURRENT REQUIRED TO PRODUCE 193000 C OF ELECTRICITY IS 35.74 A.
Explanation:
Equation:
Al3+ + 3e- -------> Al
3 F of electricity is required to produce 1 mole of Al
3 F of electricity = 27 g of Al
If 18 g of aluminium was used, the quantity of electricity to be used up will be:
27 g of AL = 3 * 96500 C
18 G of Al = x C
x C = ( 3 * 96500 * 18 / 27)
x C = 193 000 C
For 18 g of Al to be produced, 193000 C of electricity is required.
To calculate the current required to produce 193 000 C quantity of electricity, we use:
Q = I t
Quantity of electricity = Current * time
193 00 = I * 1.50 * 60 * 60 seconds
I = 193 000 / 1.50 * 60 *60
I = 193 000 / 5400
I = 35.74 A
The cuurent required to produce 193,000 C of electricity by 18 g of aluminium is 35.74 A
Answer:
Waves carry energy from place to place.
Explanation:
Some waves are used for mainly communication and phone signals. They help people get internet in the middle of nowhere if you are near an energy wave.
Answer: See description
Explanation:
Kepler's laws have three principal points:
1. planets orbit the sun in elliptical paths
2. the orbial period is related to the orbital distance by ![T^{2} = d^3](https://tex.z-dn.net/?f=T%5E%7B2%7D%20%3D%20d%5E3)
where T is the orbital period and d is the orbital distance, T is in years and d is measured in units of the earth sun distance.
3. planets closer to the sun move faster than planets far away from it.
Newton:
Newton discovered that there is a consequence to the gravity exerted by objects: mass, the heavier the planet, the more gravitational force it posseses ( thats why we orbit the sun)
with the gravitational force
newton discovered the inverse-quadratic relationship between the distance of the planets and the acceleration exerted by the force one could exert on another.
Kepler's laws were mostly based on observed evidence with quantitative relationships between the mentioned variables. Newton's laws are based on calculus and symbolic equations. While Kepler's mode is basic, Newton took another step in and build a more general model for gravity (which was improved by general relativity later). In a nutshell Newton proved the scientific causes for Kepler's laws...
Answer:
![\large \boxed{\text{98 m$\cdot$s}^{-2}}](https://tex.z-dn.net/?f=%5Clarge%20%5Cboxed%7B%5Ctext%7B98%20m%24%5Ccdot%24s%7D%5E%7B-2%7D%7D)
Explanation:
The formula for the velocity of the ball is
![v = \sqrt{2gh}](https://tex.z-dn.net/?f=v%20%3D%20%5Csqrt%7B2gh%7D)
1. Velocity at time of impact
![v = -\sqrt{2 \times 9.807 \times 1.20} = -\sqrt{23.54} = -\textbf{4.85 m/s}](https://tex.z-dn.net/?f=v%20%3D%20-%5Csqrt%7B2%20%5Ctimes%209.807%20%5Ctimes%201.20%7D%20%3D%20-%5Csqrt%7B23.54%7D%20%3D%20-%5Ctextbf%7B4.85%20m%2Fs%7D)
2. Velocity on rebound
The ball has enough upward velocity to reach a height of 0.86 m.
![v = \sqrt{2 \times 9.807 \times 0.86} = \sqrt{16.87} =\textbf{4.11 m/s}](https://tex.z-dn.net/?f=v%20%3D%20%5Csqrt%7B2%20%5Ctimes%209.807%20%5Ctimes%200.86%7D%20%3D%20%5Csqrt%7B16.87%7D%20%3D%5Ctextbf%7B4.11%20m%2Fs%7D)
3. Acceleration
![a = \dfrac{\Delta v}{\Delta t} = \dfrac{4.11 - (-4.85)}{ 0.091} = \dfrac{8.96 }{0.091} =\textbf{98 m$\cdot$s}^{\mathbf{-2}}\\\\\text{The acceleration while the ball is in contact with the floor is $\large \boxed{\textbf{98 m$\cdot$s}^{\mathbf{-2}}}$}](https://tex.z-dn.net/?f=a%20%3D%20%5Cdfrac%7B%5CDelta%20v%7D%7B%5CDelta%20t%7D%20%3D%20%5Cdfrac%7B4.11%20-%20%28-4.85%29%7D%7B%200.091%7D%20%3D%20%5Cdfrac%7B8.96%20%7D%7B0.091%7D%20%3D%5Ctextbf%7B98%20m%24%5Ccdot%24s%7D%5E%7B%5Cmathbf%7B-2%7D%7D%5C%5C%5C%5C%5Ctext%7BThe%20acceleration%20while%20the%20ball%20is%20in%20contact%20with%20the%20floor%20is%20%24%5Clarge%20%5Cboxed%7B%5Ctextbf%7B98%20m%24%5Ccdot%24s%7D%5E%7B%5Cmathbf%7B-2%7D%7D%7D%24%7D)
Answer:
The correct answer is b. 1280 cm^2