imagine riding a single-speed bicycle. why do you have to push harders on the pedals to start the bicycle moving than to keep it
1 answer:
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Answer:
0.143 m
Explanation:
The relationship between force applied on a string and stretching of the spring is given by Hooke's law:
where
F is the force exerted on the spring
k is the spring constant of the spring
x is the stretching of the spring from its equilibrium position
In this problem, we have:
F = 20 N is the force applied on the spring
k = 140 N/m is the spring constant
Solving for x, we find how far the spring will stretch:
Answer:
the image is -38.7 cm from the lens
Explanation:
We use the lens equation which says
where is the distance to the object,
is the distance to the image, and
is the focal length.
Now, in our case
,
,
;
therefore,
where the negative sign indicates that the image is virtual and on the same side of the lens as the object.
The electrostatic force on charge 3 is 16.9 N to the right
Explanation:
The magnitude of the electrostatic force between two charges is given by Coulomb's law:
where:
is the Coulomb's constant
are the two charges
r is the separation between the two charges
The force is attractive if the two charges have opposite sign and repulsive if the two charges have same sign.
Here we have to find the total force on the 3rd charge, so we have to calculate the vector sum of the forces produced by the other 2 charges.
For the force due to charge 1, we have
Charge 1 is located at x = 10 cm while charge 3 is at x = -2 cm, so their distance is
So the force between them is
And the direction of the force on charge 3 is to the left, since the force is repulsive (charges have same sign)
For the force due to charge 2, we have
Charge 2 is located at x = 8 cm while charge 3 is at x = -2 cm, so their distance is
So the force between them is
And the direction of the force on charge 3 is to the right, since the force is attractive (charges have opposite sign)
Therefore, the net force on charge 3 is
So, the net force is 16.9 N to the right.
Learn more about electrostatic force:
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