Pam, with a mass of 40.4 kilograms, straps on a rocket pack while wearing her roller blades. The rocket supplies a constant forc
1 answer:
You might be interested in
The work done to pull the sled up to the hill is given by
where
F is the intensity of the force
d is the distance where the force is applied.
In our problem, the work done is
and the distance through which the force is applied is 
, so we can calculate the average force by re-arranging the previous equation and by using these data:
where
F is the intensity of the force
d is the distance where the force is applied.
In our problem, the work done is
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:
