A device is rated at 1.3kW when connected to a 120 V source. The equivalent resistance of this device in ohm is:
1 answer:
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Answer:
Zero
Explanation:
The work done by a force on an object is given by:
where
F is the magnitude of the force
d is the displacement of the object
is the angle between the direction of the force and the displacement of the object
In this situation, the force is the force of gravity acting on the satellite. This force always points towards the centre of the trajectory, so it is always perpendicular to the direction of motion of the satellite (since the orbit is circular), so and
. Therefore, the work done by gravity is also zero.
B. Exactly the same as the electric force of the electron on the proton.
<u>Explanation:</u>
Even if the mass of proton is increased or decreased, the force between electron and proton will remain the same because force is dependent on the charge of the object and distance between them. The force between the charges is independent of their masses. So, even if the mass of a proton is 1833 times larger than the mass of an electron, the force between them will be same.
According to Coulomb's law:
where,
F is the force
q₁ and q₂ are the charges
r is the distance between the charges