The arterioles (small arteries) leading to an organ, constrict in order to decrease flow to the organ. To shut down an organ, bl
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Complete Question
The diagram for this question is shown on the first uploaded image
Answer:
The minimum velocity of A is
Explanation:
From the question we are told that
The length of the string is
The initial speed of block A is
The final speed of block A is
The initial speed of block B is
The mass of block A is gh
The mass of block B is
According to the principle of conservation of momentum
Since block B at initial is at rest
making the subject of the formula
Substituting values
This is the velocity at bottom of the vertical circle just at the collision with mass A
Assuming that block B is swing through the vertical circle(shown on the second uploaded image ) with an angular velocity of at the top of the vertical circle
The angular centripetal acceleration would be mathematically represented
Note that this acceleration would be toward the center of the circle
Now the forces acting at the top of the circle can be represented mathematically as
Where T is the tension on the string
According to the law of energy conservation
The energy at bottom of the vertical circle = The energy at the top of
the vertical circle
This can be mathematically represented as
From above
Substitute this into above equation
The value of velocity of block A needed to cause B be to swing through a complete vertical circle is would be minimum when tension on the string due to the weight of B is zero
This is mathematically represented as
making the subject
substituting values
The question is incomplete! circuit figure is attached below and answer and explanation is provided below.
Answer:
Bulb_A = Bulb_B = Bulb_D and Bulb_C = 0.
Explanation:
What happens when switch is open?
When the switch is open Bulb_C is open circuited meaning that there is no way for the current to flow through it. This path offers infinite resistance to the current therefore, current will try to take a least resistance path that is through Bulb_B.
So eventually, when the switch is open the circuit becomes a simple series circuit with path From battery to Bulb_A to Bulb_B to Bulb_D to battery with Bulb_C = 0.
What happens in a series circuit?
We know that in a series circuit, there is only one path for the current to flow therefore, same current will flow through all the series Bulbs and their brightness will be same. Bulb_A = Bulb_B = Bulb_D
Brightness in a series circuit:
We also know know that in a series circuit, resistance gets summed up and voltage across each Bulb gets shared which results in less power dissipation that's why Bulbs connected in series appear dimmer as compared to when they are connected in parallel.
