To get the total resistance in a parallel circuit, you need to remember that unlike in a series, you do not just merely add the resistances. You need to get the reciprocal first of each resistance and add them together.
![\frac{1}{R_{T}} = \frac{1}{R_{1}}+\frac{1}{R_{2}}+\frac{1}{R_{3}}... +\frac{1}{R_{n}}](https://tex.z-dn.net/?f=%20%5Cfrac%7B1%7D%7BR_%7BT%7D%7D%20%3D%20%20%5Cfrac%7B1%7D%7BR_%7B1%7D%7D%2B%5Cfrac%7B1%7D%7BR_%7B2%7D%7D%2B%5Cfrac%7B1%7D%7BR_%7B3%7D%7D...%20%2B%5Cfrac%7B1%7D%7BR_%7Bn%7D%7D%20)
After adding them, you will get the reciprocal again and then compute for the value. The problem says that there are 4 resistors in the circuit that have a resistance of 75.
![\frac{1}{R_{T}} = \frac{1}{75}+\frac{1}{75}+\frac{1}{75}+\frac{1}{75}](https://tex.z-dn.net/?f=%20%5Cfrac%7B1%7D%7BR_%7BT%7D%7D%20%3D%20%5Cfrac%7B1%7D%7B75%7D%2B%5Cfrac%7B1%7D%7B75%7D%2B%5Cfrac%7B1%7D%7B75%7D%2B%5Cfrac%7B1%7D%7B75%7D%20)
Add up the numerator and copy the denominator:
![\frac{1}{R_{T}} = \frac{4}{75}](https://tex.z-dn.net/?f=%20%5Cfrac%7B1%7D%7BR_%7BT%7D%7D%20%3D%20%5Cfrac%7B4%7D%7B75%7D)
Then get the reciprocal to get the total resistance:
![R _{T} = \frac{75}{4} = 18.75](https://tex.z-dn.net/?f=R%20_%7BT%7D%20%3D%20%5Cfrac%7B75%7D%7B4%7D%20%20%3D%2018.75)
The answer to your question then is A. 18.8.
One that can help you is:
ΔT=<span>T<span>Final</span></span>−<span>T<span>Initia<span>l
That is of course adding both tmepratures. There is one more that is a lil bit more complex
</span></span></span><span><span>Tf</span>=<span>Ti</span>−Δ<span>H<span>rxn</span></span>∗<span>n<span>rxn</span></span>/(<span>C<span>p,water</span></span>∗<span>m<span>water</span></span>)
This one is taking into account that yu can find temperature and that there could be a change with a chemical reaction. Hope this helps</span>
weight is vector vary from place to place
Answer:
16.4287
Explanation:
The force and displacement are related by Hooke's law:
F = kΔx
The period of oscillation of a spring/mass system is:
T = 2π√(m/k)
First, find the value of k:
F = kΔx
78 N = k (98 m)
k = 0.796 N/m
Next, find the mass of the unknown weight.
F = kΔx
m (9.8 m/s²) = (0.796 N/m) (67 m)
m = 5.44 kg
Finally, find the period.
T = 2π√(m/k)
T = 2π√(5.44 kg / 0.796 N/m)
T = 16.4287 s
Answer:
acceleration
Explanation:
The rate at which velocity changes is the definition of the physical quantity called acceleration, and it is given by the formula: ![a=\frac{v_f-v_i}{\Delta t}](https://tex.z-dn.net/?f=a%3D%5Cfrac%7Bv_f-v_i%7D%7B%5CDelta%20t%7D)
where
is the time that took to change from the initial velocity
to the final velocity ![v_f](https://tex.z-dn.net/?f=v_f)