An apple falls from a tree and hits the ground 9.98 m below. with what speed will it hit the ground
1 answer:
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Answer:
True.
Explanation:
The density of an object is given by its mass divided by its volume. It can be given as follows :
It can be seen that the density of an object is directly proportional to its mass. It means if the mass of an object increase, its density will also increase. Hence, the given statement is true.
The strength of the magnetic field is
Explanation:
When a charged particle is moving in a uniform magnetic field, the particle experiences a force perpendicular to the direction of motion. This force is given by
where
q is the charge of the particle
v is the velocity of the particle
B is the strength of the magnetic field
Since this force acts perpendicular to the direction of motion, the particle moves in a circular motion and the force acts as a centripetal force, so we can write:
where
m is the mass of the particle
r is the radius of the circular orbit
We can re-arrange the equation in order to isolate B:
In this problem, we have electrons, with
r = 0.25 m
Substituting these numbers, we find the strength of the magnetic field:
Learn more about magnetic fields:
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