Randomkid0973
31.08.2020 •
Physics
What is the magnitude of the electric force on the charge at the bottom left-hand vertex of the triangle due to the other two charges
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Ответ:
Explanation:
The magnitude on the charge at the bottom-left corner due to the charge on the top vertex of the triangle will act along the +ve x-axis and the +ve y-axis.
From Coulomb's law the magnitude of the forces on the charge at the bottom-left corner, due to the charge on the top vertex of the triangle are cos 60, and
The magnitude on the charge due to the charge at the bottom-right corner will only act in the -ve x-axis, since they repel each other (like charges repel). The magnitude is
The angle made by the upper charge to the charge we're considering is 60° with the horizontal.
The total force on the charge along the x-axis is
= cos 60 -
= -
==> -
For the y-axis, we have
= sin 60
=
The resultant force is
The common factors between the two x-axis force, and the y-axis force is
, we put this outside the square root (squaring this and square rooting will give us the initial value)
=
=
==>
the magnitude of the electric force on the charge at the bottom left-hand vertex of the triangle due to the other two charges is
=
Ответ:
Explanation:
The question says that, "After how long does a mobile acquire a speed of 30 m / s, if it starts from rest and its acceleration is 3 m / s*2"
Initial speed is 0
Final speed is 30 m/s
Acceleration a = 3 m/s²
It is required to find time when it acquire a speed of 30 m/s. Using equation of kinematics as :
So, after 10 seconds it will acquire a speed of 30 m/s.