As we have all learned from Newton #3, every action has an equal, opposite reaction.
The force that the football exerts on the kicker's foot is <em>equal</em> to the force with which the kicker's foot impacts the ball. (<em>100 N</em>)
Answer:increases
Explanation:
If we are going upward in an elevator from the ground floor to the top floor then it indicates that your distance from the center of the earth is increasing while the time period remains the same.
If the radial distance is increased then the tangential velocity of the object must be increased because the time period is the same.
This can be best explained by taking an example of a car moving in a circle of radius r. If radial is increased for the same period then the car has to travel at a higher velocity to make in time.
Answer:
Explanation:
Potential Energy of an object is a function of elevation from datum thus assuming datum to be ground, the potential energy of the person increases as he moves up to the top.
When a person is skating from the top of the track to the bottom then his potential energy is getting converted into the kinetic energy so his kinetic energy increases as he moves down.
When a person is moving from top to bottom his kinetic energy increases which is a function of mass and velocity. As mass is fixed therefore his velocity increases as he moves down
B. A machine changes the magnitude or direction of the force. Hope that helped.
Answer:
-3.4 eV (
)
Explanation:
In a hydrogen atom, the energy of an electron is given by:
![E_n = - 13.6 eV \frac{1}{n^2}](https://tex.z-dn.net/?f=E_n%20%3D%20-%2013.6%20eV%20%5Cfrac%7B1%7D%7Bn%5E2%7D)
where
n is the principal quantum number
For an electron in the 2s orbital,
n = 2
So substituting this value into the formula, we find
![E_2 = -13.6 eV \frac{1}{2^2}=-3.4 eV](https://tex.z-dn.net/?f=E_2%20%3D%20-13.6%20eV%20%5Cfrac%7B1%7D%7B2%5E2%7D%3D-3.4%20eV)
And converting this into Joules, we have
![E_2 = -3.4 eV \cdot 1.6\cdot 10^{-19} J/eV=-5.4\cdot 10^{-19} J](https://tex.z-dn.net/?f=E_2%20%3D%20-3.4%20eV%20%5Ccdot%201.6%5Ccdot%2010%5E%7B-19%7D%20J%2FeV%3D-5.4%5Ccdot%2010%5E%7B-19%7D%20J)