1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
xxMikexx [17]
3 years ago
15

Why it is advise to clean the ends of connecting wires before connecting them?

Physics
2 answers:
densk [106]3 years ago
8 0
To avoid poor contact and consequently the increase of the electrical resistance at the junction.
Svetradugi [14.3K]3 years ago
5 0
If dirt and grease were good conductors of electrical current, then we could make wire
out of dirt and grease instead of expensive copper.  Sadly, they're not. So a coating of
dirt and grease on the wire can have a substantial impact on the connection, and can
even block the flow of current across the connection completely.  Moreover, in the case
where the ends of the wires are to be soldered, solder does not adhere to dirty wire.
You might be interested in
The Reynolds number, rho VD/mu, is a very important parameter in fluid mechanics. Verify that the Reynolds number is dimensionle
Agata [3.3K]

Answer:

Re = 1 10⁴

Explanation:

Reynolds number is

         Re = ρ v D /μ

The units of each term are

       ρ = [kg / m³]

       v = [m / s]

      D = [m]

      μ = [Pa s]

The pressure

      Pa = [N / m²] = [Kg m / s²] 1 / [m²] = [kg / m s²]

      μ = [Pa s] = [kg / m s²] [s] = [kg / m s]

We substitute the units in the equation

      Re = [kg / m³] [m / s] [m] / [kg / m s]

      Re = [kg / m s] / [m s / kg]

      RE = [ ]

Reynolds number is a scalar

Let's evaluate for the given point

Where the data for methane are:

viscosity       μ = 11.2 10⁻⁶ Pa s

the density  ρ = 0.656 kg / m³

       D = 2 in (2.54 10⁻² m / 1 in) = 5.08 10⁻² m

       Re = 0.656 4 2 5.08 10⁻² /11.2 10⁻⁶

       Re = 1.19 10⁴

4 0
3 years ago
Which stage follows the red giant stage of star development, if the star is a high-mass star? 
Anestetic [448]
I believe it's a supernova 
3 0
3 years ago
A compound consisting of only phosphorous and oxygen atoms is 43.64 % phosphorus by mass.The molecular mass/formula weight of th
DanielleElmas [232]
First, we calculate the mass of Phosphorous present:
283.88 x 0.4364
= 123.88 amu
Atomic mass of P is 31 amu

moles of P = mass / Ar
= 123.88 / 31
= 4.0 moles

We know that one mole of substance has 6.02 x 10²³ particles
Atoms of P = 4 x 6.02 x 10²³ 
= 2.41 x 10²⁴ atoms
6 0
3 years ago
Which type of evidence was used to tie Ted Bundy to the murder of Lisa Levy?
Elodia [21]

Explanation:

identified by one of the Chi Omega survivors as the assailant, and hair and fiber evidence tied him to the Leach murder. His trial for the Florida attacks in June 1979 was the first-ever nationally televised trial in the United States.

6 0
1 year ago
A sample contains 110 g of a radioactive isotope. how much radioactive isotope will remain in the sample after 1 half-life?
Lerok [7]

Answer:

The half-life of a radioactive isotope is the time such that the initial amount of the isotope is reduced to its half.

Thus, if we start with A grams of a given radioactive isotope, after a 1 half-life, we will have A/2 grams of the radioactive isotope.

In this case, we know that the sample has 110g of a radioactive isotope.

Then, after 1 half-life, we should have half of 110g, which is:

110g/2 = 55g

Then we should have 55 g of a radioactive isotope.

The answer that is closer to this result is option d (50 g), so that is the correct one.

5 0
2 years ago
Other questions:
  • in the circuit diagram, what does the symbol made of two long lines and two short likes with a positive and a negative sign at e
    8·1 answer
  • A bird, accelerating from rest at a constant rate, experiences a displacement of 28 m in 11 s. what is the final velocity after
    7·1 answer
  • True or false? Once the sun explodes, the whole solar system will go with it.
    8·1 answer
  • What does basketballs have inside of it
    12·1 answer
  • What causes the pressure that allows diamonds to form in the mantle?
    14·1 answer
  • What happened as the mass of the sun increased during formation of the solor system
    13·1 answer
  • Which of the following non-metals is used as a lubricant in powdered form?
    13·1 answer
  • What is displacement and distance
    7·1 answer
  • What is the equilibrium constant for the following reaction at 25 °c?
    5·1 answer
  • astronauts brought back 500 lb of rock samples from the moon. how many kilograms did they bring back? 1 kg
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!