Which of jupiter’s moons is the largest moon in the solar system?.
1 answer:
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The final combined speed of the two trains is 3.4 m/s
Explanation:
We can solve this problem by using the law of conservation of momentum: in absence of external forces, the total momentum of the two trains must be conserved before and after the collision.
Therefore we can write:
where:
is the mass of the first train
is the initial velocity of the first train, which is at rest
is the mass of the second train
is the initial velocity of the second train
is the final combined velocity of the two trains after the collision
We can now solve the equation for v, to find the final combined velocity of the two trains:
So, the final combined speed is 3.4 m/s.
Learn more about momentum here:
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Answer:
Negative z-direction.
Explanation:
We need to determine the direction of the magnetic force. Since the velocity of the proton is in the positive x direction, and the magnetic field is in the positive y direction, we know by the vectorial formula (or, alternatively, with the <em>left hand rule</em>) that the magnetic force points in the positive z-direction (also taking into account that <u>the charge is positive</u>), so the electric field should be in the negative z-direction to balance it.