You are riding in an enclosed train car moving at 90 km/h.. If you throw a baseball straight up, where will the baseball land?.
2 answers:
Answer:
here the ball we land exactly into the hand of the person who throw it upwards.
Explanation:
Since train is moving with uniform speed as
now when we throw a ball vertically upwards with certain velocity then due to inertia the ball will automatically start moving in horizontal direction with same speed as that the speed of the train
so while ball is in air then the distance moved by the ball in horizontal direction will be same as that the distance moved by the train in horizontal direction.
So here the ball we land exactly into the hand of the person who throw it upwards.
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The electron is accelerated through a potential difference of 
, so the kinetic energy gained by the electron is equal to its variation of electrical potential energy:
where
m is the electron mass
v is the final speed of the electron
e is the electron charge
is the potential difference
Re-arranging this equation, we can find the speed of the electron before entering the magnetic field:
Now the electron enters the magnetic field. The Lorentz force provides the centripetal force that keeps the electron in circular orbit:
where B is the intensity of the magnetic field and r is the orbital radius. Since the radius is r=25 cm=0.25 m, we can re-arrange this equation to find B:
where
m is the electron mass
v is the final speed of the electron
e is the electron charge
Re-arranging this equation, we can find the speed of the electron before entering the magnetic field:
Now the electron enters the magnetic field. The Lorentz force provides the centripetal force that keeps the electron in circular orbit:
where B is the intensity of the magnetic field and r is the orbital radius. Since the radius is r=25 cm=0.25 m, we can re-arrange this equation to find B: