PHYSICS HIGH SCHOOL

A 25.0-meter length of platinum wire with a cross-sectional area of 3.50 × 10^−6 meter^2 has a resistanceof 0.757 ohm at 20°C. Calculate the resistivity of the wire. [Show all work, including the equation and
substitution with units.]

Answers

Answer 1
Answer:

The resistivity of the plantinum wire is 1.06 × 10⁻⁷Ωm

Calculating Resistivity

From the question,

We are to determine the resistivity of the wire

Resistivity can be calculated from the formula

\rho = (RA)/(l)

Where \rho is the resistivity of the wire

R is the resistance

A is the cross-sectional area

and l is the length of the wire

From the given information,

R = 0.757 ohm (Ω)

A = 3.50 × 10⁻⁶ m²

l = 25.0 m

Putting the parameters into the formula, we get

\rho = (0.757 * 3.50 * 10^(-6) )/(25)

\rho = 0.10598 * 10^(-6)

\rho = 1.0598 * 10^(-7)

\rho \approx 1.06 * 10^(-7) \ \Omega m

Hence, the resistivity of the plantinum wire is 1.06 × 10⁻⁷Ωm

Learn more on Calculating Resistivity here: brainly.com/question/5595373
Answer 2
Answer: R= (rou * L) / area
where R is the wire resistance
rou: resistivity of the wire material
L : wire length
A : cross section area of wire
by sub.
0.757= (rou*25)/ 3.5*10^-6
25*rou = 2.6495*10^-6
rou= 1.0598*10^-7 ohm.m

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A chlorine ion contains 17 protons, 18 neutrons, and 18 electrons. What is the net charge of the ion? A. -e B. 0 C. +e D. -18e

Which of the following substances are NOT formed by chemical bonds?A. mixture
B. molecule
C. compound
D. pure substance

Answers

Answer:

The answer is D. pure substance.

Explanation:

A pure substance is a particular class of homogeneous matter whose composition is fixed and chemically defined, that is, it has a stable chemical composition since it is a matter that remains chemically unaltered in its different states of aggregation, endowed with properties singular and characteristic. A pure substance is composed of entities such as molecules, formular units and atoms.
Pure substance becuase if it is pure it is not a bond

Ksp for agbr is 5x10-13. what is the maximum concentration of silver ion that you can have in a 0.1 m solution of nabr?

Answers

Answer : The maximum concentration of silver ion is 5* 10^(-12)m

Solution : Given,

K_(sp) for AgBr = 5* 10^(-13)

Concentration of NaBr solution = 0.1 m

The equilibrium reaction for NaBr solution is,

NaBr(aq)\rightleftharpoons Na^++Br^-

The concentration of NaBr solution is 0.1 m that means,

[Na^+]=[Br^-]=0.1m

The equilibrium reaction for AgBr is,

                          AgBr\rightleftharpoons Ag^++Br^-

At equilibrium                     s       s

The expression for solubility product constant for AgBr is,

K_(sp)=[Ag^+][Br^-]

The concentration of Ag^+ = s

The concentration of Br^- = 0.1 + s

Now put all the given values in K_(sp) expression, we get

5* 10^(-13)=(s)(0.1+s)

By rearranging the terms, we get the value of 's'

s=5* 10^(-12)m

Therefore, the maximum concentration of silver ion is 5* 10^(-12)m.
[Br⁻¹] = [NaBr] = 0.1

Ksp = [Ag⁺] x [Br⁻]
5 x 10⁻¹³ = [Ag⁺] x 0.1
[Ag⁺] = 5 x 10⁻¹²

What is the temperature of a gas in which the atoms are moving very very slowly?

Answers

Cold.
Example: A frozen object (such as ice) is solid. Its molecules move extremely slow because the object itself isn't moving... It's like the skin on your bod... Imagine that wiggling and writhing on your bones. It's not like a gas, that can move freely and has no specific form or hold.
So again, the answer is Cold. 

A cheetah runs with a positive acceleration. What does this tell you about the velocity time graph for the cheetah?A. Graph negative slope
B. graph positive slope
C. Graph positive area
D. Graph negative area

Answers

B is the correct answer

Answer:

B. graph positive slope

Explanation:

got it right

a relative density bottle has a mass of 29.2 g when empty its mass is 116.2 g when it is full of liquid or diesel and when full of water it's mass is 129.2 g calculate the relative density of diesel​

Answers

Answer:

0.87

Explanation:

Given :

Mass of bottle = 29.2 g

Mass when filled with diesel = 116.2 g

Mass when filled with water = 129.2 g

The mass of water = (Mass when filled with water - mass of bottle)

Mass of water = 129.2 - 29.2 = 100 g

Mass of diesel = (Mass when filled with diesel - mass of bottle)

Mass of diesel = 116.2 - 29.2 = 87

Relative density of diesel = mass of diesel / mass of equal volume of water

Relative density = 87 / 100 = 0.87

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Answers

You kick a ball with a speed of 18 m/s at an angle of 32 degrees. How far away does the ball land? 
d = V^2/g*sin(32*2) = 18^2/9.8*0.90 = 29.72 m

Answer:

29.7m

Explanatio
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