In 1842, Julius Robert Mayer discovered The law of conservation of Energy. It its most compact form, it it now called The first law of Thermodynamics
Energy can neither be created nor destroyed, it can only be changed to another form of energy.
Answer:
<em>K =400000 J</em>
Explanation:
<u>Kinetic Energy</u>
Is the energy an object has due to its state of motion. It's proportional to the square of the speed.
The equation for the kinetic energy is:
![\displaystyle K=\frac{1}{2}mv^2](https://tex.z-dn.net/?f=%5Cdisplaystyle%20K%3D%5Cfrac%7B1%7D%7B2%7Dmv%5E2)
Where:
m = mass of the object
v = speed at which the object moves
The kinetic energy is expressed in Joules (J)
The car has a mass of m=2000 Kg and travels at v=20 m/s. Calculating the kinetic energy:
![\displaystyle K=\frac{1}{2}2000*20^2](https://tex.z-dn.net/?f=%5Cdisplaystyle%20K%3D%5Cfrac%7B1%7D%7B2%7D2000%2A20%5E2)
Calculating:
K =400000 J
False.
Theories are hypotheses that have been shown to accurately and predictably explain results obtained through repeated experimentation, to the point where the hypothesis can be assumed to be true. Then, such a hypothesis would be considered a theory.
Answer:
electrons
Explanation:
The total charge Q is the sum of the charge of the N electrons contained in the sphere:
![Q=N*q_{e}](https://tex.z-dn.net/?f=Q%3DN%2Aq_%7Be%7D)
charge of a electron
We solve to find N:
![N=\frac{Q}{q_{e}}=\frac{-6 x 10^{-6}}{-1.6 x 10^{-19}}=3.75*10^{-13}](https://tex.z-dn.net/?f=N%3D%5Cfrac%7BQ%7D%7Bq_%7Be%7D%7D%3D%5Cfrac%7B-6%20x%2010%5E%7B-6%7D%7D%7B-1.6%20x%2010%5E%7B-19%7D%7D%3D3.75%2A10%5E%7B-13%7D)
The answer i think would be D