A mass attached to a vertical spring causes the spring to stretch and the mass to move downwards. What can you say about the pot
2 answers:
Complete Question
A mass attached to a vertical spring causes the spring to stretch and the mass to move downwards. What can you say about the spring's potential energy Us and the gravitational potential energy Ug of the mass?
A. both Us and Ug decrease
B. Us increases and Ug decreases
C Both Us and Ug increase
D Us decreases and Ug increases
E Us increases and Ug is constant
Answer:
Option B is the correct Answer
Explanation:
The Gravitational Potential energy is mathematically represented as
Where m is the mass , g is the acceleration due to gravity while and h is the height
And in term of the spring this energy represents the workdone against gravitational Force
The Spring potential energy is mathematically represented as
Where k is the spring constant ans x is the extension in the spring
And energy represents the work that is being done to stretch the spring
If the system as state in the question is setup and is being increased then
decreases
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Answer:
Explanation:
Fa - u*m*g = m*a
Fa = u*m*g + m*a
Fa - m*a = u*m*g
u =
Answer:
1)
In this circuit (see attachment #1), we have:
- A voltage source: in this case, we choose a battery. A voltage source is a device producing an electromotive force (in a battery, this is done by means of a chemical reaction), which is responsible for "pushing" the electrons along the circuit and creating a current. The electromotive force (emf) of the battery is also called voltage, and it is indicated with the letter V.
- Four resistors: a resistor is a device which opposes to the flow of current. The property that describes by "how much" the resistor "opposes" to the flow of current is called "resistance", and it is indicated with the letter R.
- In this circuit, the 4 resistors are in series. Resistors are said to be in series when they are connected along the same branch of the circuit, so that the same current flow across each of them.
- For resistors in series, the equivalent resistance of the circuit is given by the sum of the individual resistances:
2)
In this circuit (see attachment #2), we have:
- A voltage source: as before, we have chosen a battery, providing an electromotive force to the circuit
- Three resistors wired in parallel. Resistors are said to be connected in parallel when they are connected along different branches, but with their terminals connected to the same point, so that each of them has the same potential difference across it.
- For resistors in parallel, the equivalent resistance of the circuit is calculated using the formula:
3)
In this circuit (see attachment #3), we have:
- A voltage source (again, we have choosen a battery)
- Three resistors, of which:
-- 2 of them are connected in parallel with each other
-- the 3rd one it is in series with the first two
If we call the resistances of the first 2 resistors in parallel, their equivalent resistance is:
Then, these two resistors are connected in series with resistor ; and so, the total resistance of this circuit will be:
4)
In this circuit (see attachment #4), we have:
- A voltage source (again, a battery)
- We have 6 resistors, which are arranged as follows:
-- Two branches each containing 3 resistors
-- The two branches are in parallel with each other
So, the total resistance of the two branches are:
And since the two branches are in parallel, their total resistance will be:
