What happens in this circuit if one of the light bulbs is unscrewed?
2 answers:
Answer:
B. The other bulb stays lit.
Explanation:
You did not provide the picture of the circuit but here are some suggestions.
Based on the choices given:
A)The other bulb goes out.
B)The other bulb stays lit.
C)Current stops flowing in the circuit.
D)The current path in the circuit is broken.
Choices A, C, and D all happen when a light bulb is unscrewed in a series circuit. A series circuit is a circuit where all the resistors are lined up in a single path. In order for current to flow, the resistors need to be all functional. When you take one out, the flow of current stops because the one path it flows through is broken. As a result, other resistors in the circuit will no longer work.
As for choice B, this occurs in a parallel circuit. In a parallel circuit the resistors are arranged in parallel paths. The paths branch off and thus so does the flow of current. If you take out one of the light bulbs in a parallel circuit, the other light bulbss would remain lit because the flow of current has an alternative path to move through.
Attached is a diagram of a series and a parallel circuit.
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1) The gravitational force between Ellen and the moon is
2) The two forces are equal, while the acceleration of the bus is smaller than the acceleration of the bicycle.
Explanation:
1)
The magnitude of the gravitational force between two objects is given by
where
is the gravitational constant
are the masses of the two objects
r is the separation between them
In this problem, we have:
is the mass of Ellen
is the mass of the moon
is the distance between Ellen and the moon
Substituting, we find the gravitational force between Ellen and the moon:
2)
We can analyze the forces acting in the collision between the bus and the bicycle by using Newton's third law of motion, which states that:
"When an object A exerts a force (called action) on an object B, then object B exerts an equal and opposite force (called reaction) on object A"
Applied to our problem, this means that the force exerted by the bus on the bicycle during the collision (action force) is equal (and opposite) to the force exerted by the bicycle on the bus (reaction force).
Now let's analyze the accelerations of the two vehicles. We can find the acceleration of each vehicle by using Newton's second law:
where
a is the acceleration
F is the force exerted on the vehicle
m is the mass of the vehicle
As we said previously, the force F exerted on each of the two vehicles: so, the acceleration only depends on the mass. In particular, the acceleration is inversely proportional to the mass: therefore, the larger the mass of the vehicle, the smaller the acceleration. This means that the acceleration of the bus is smaller than the acceleration of the bicycle.
Learn more about gravitational force:
And about Newton's third law:
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