A frictional torque is exerted on a platform while it rotates because the force is along it's axis and changes only the magnitude and not the direction of the angular velocity.
<h3>What is frictional torque?</h3>
A frictional torque is a rotational force that is caused by the movement of two objects that are in contact.
To collect data needed to find the frictional torque exerted on the platform while it rotates the experimental procedure the student should use include the following:
- A disc shaped platform with know inertia
- The platform should be mounted on a fixed axle.
- The platform should also be rotating on a horizontal plane.
The quantities that should be measured is that rotational frictional force and angular velocity.
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The mutual inductance of the two coils is 1.28*10^-3H.
To find the answer, we have to know about the mutual inductance.
<h3>How to find the
mutual inductance of the two coil?</h3>
- We have the expression for emf in terms of mutual inductance and rate of change of current as,
- From the question, it is clear that,
- Thus, the mutual inductance is,
Thus, we can conclude that, the mutual inductance of the two coils is 1.28*10^-3H.
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Answer: 3. F1 = F2
Explanation:
According to <u>Newton's law of Gravitation</u>, the force exerted <u>between two bodies</u> or objects of masses and and separated by a distance is equal to the product of their masses divided by the square of the distance:
(1)
Where is the gravitational constant
Now, in the especific case of the Earth and the satellite, where the Earth has a mass and satellite a mass , being both separated a distance , the force exerted by the Earth on the satellite is:
(2)
And the force exerted by the satellite on the Earth is:
(3)
As we can see equations (2) and (3) are equal, hence the magnitude of the gravitational force is the same for both:
Mechanical to electrical - generator
Electrical to mechanical - motor
Hope it helps