Answer:4. Two charged objects have a repulsive force of 0.080 N. If the distance separating the objects is tripled, then what is the new force? Explanation: The electrostatic force is inversely related to the square of the separation distance.
Explanation:
Let's rewrite Hook's law:
where
F is the force
k is the spring's constant
x is the compression/elongation of the spring
Neglecting the sign (since we are not interested in the direction of the force), we can re-arrange the formula and use the data of the problem to find the spring constant:
Therefore, the correct answer is B) 2 N/cm.
Magnification is the ratio of the image's height to object's height or the ratio of image distance to object distance.
That is; Magnification = height of the image/height of object= image distance/object distance
= x/4 = 21/8
x = (21 × 4)/8
= 10.5 cm
The height of the image is 10.5 cm
The mirror in this case is a concave mirror, since when the object is placed between the principal focus and the concave mirror, it forms a virtual magnified image on the other side ofthe mirror (that is why we have a negative image distance).
Answer:
Normal force will be equal to 8.945 N
Explanation:
We have given mass of the cylinder m = 8.15 kg
Diameter d = 15 cm
So radius
Initial angular velocity
As the cylinder finally comes to rest so final angular velocity
Before coming to rest cylinder covers a distance of
From third equation of motion
Coefficient of kinetic friction
Moment of inertia of the solid cylinder
We know that
So normal force will be equal to