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2 years ago

20 POINTS…

Physics

1 answer:

xeze [42]2 years ago

6 0

The rate of molecular motion will increase as the temperature rises. At the same temperature, an object with less massive molecules will have a faster molecular speed. Two objects with the same average kinetic energy will have the same temperature when kinetic temperature is applied.

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the resistivity of gold is 2.44×10−8Ω⋅m at room temperature. A gold wire that is 0.9 mm in diameter and 14 cm long carries a cur

cricket20 [7]

Answer:

0.03605 V/m is the electric field in the gold wire.

Explanation:

Resistivity of the gold = $\rho = 2.44\times 10^{-8} \Omega.m$

Length of the gold wire = L = 14 cm = 0.14 m ( 1 cm = 0.01 m)

Diameter of the wire = d = 0.9 mm

Radius of the wire = r = 0.5 d = 0.5 × 0.9 mm = 0.45 mm = $0.45\times 0.001 m$

( 1mm = 0.001 m)

Area of the cross-section = $A=\pi r^2=\pi r^(0.45\times 0.001 m)^2$

Resistance of the wire = R

Current in the gold wire = 940 mA = 0.940 A ( 1 mA = 0.001 A)

$R=\rho\times \frac{L}{A}$

$V(voltage)=I(current)\times R(Resistance)$ ( Ohm's law)

$\frac{V}{I}=\rho\times \frac{L}{A}$

We know, Electric field is given by :

$E=\frac{dV}{dr}$

$E=\frac{V}{L}$

$E=\frac{V}{L}=\rho\times \frac{I}{A}$

$E=2.44\times 10^{-8} \Omega.m\times \frac{0.940 A}{\pi r^(0.45\times 0.001 m)^2}=0.03605 V/m$

0.03605 V/m is the electric field in the gold wire.

3 0

4 years ago

Select the correct answer.

Delicious77 [7]

Answer: A is the correct option.

Explanation:

It was officially declared eradicated in 1979 in the United States.

7 0

3 years ago

You are piloting a plane traveling 160 km/h. A child is seated behind you in the airplane. Describe the speed of the child relat

Elena-2011 [213]

Answer:

Explanation:

they are still in the same plane witch means they going the same speed

3 0

2 years ago

1) what is the potential energy at the end of the loop?

AlexFokin [52]

The potential energy at the end of the loop is equal to 0.3407 Joules.

<u>Given the following data:</u>

Mass of rock = 102.16 g to kg = 0.10216 kilogram.

Height of the loop = 34 cm to m = 0.34 meter.

Acceleration due to gravity = 9.8 $m/s^2$

<h3>What is potential energy?</h3>

Potential energy (P.E) refers to the energy that is possessed by an object due to its position (height) above planet Earth.

Mathematically, potential energy (P.E) is given by this formula;

$P.E = mgh$

<u>Where:</u>

m is the mass of an object.

g is the acceleration due to gravity.

h is the height of an object.

Substituting the given parameters into the formula, we have;

$P.E = 0.10216 \times 9.81 \times 0.34$

P.E = 0.3407 Joules.

<h3>What is kinetic energy?</h3>

Kinetic energy (K.E) refers to an energy that is possessed by a physical object due to its motion.

Mathematically, kinetic energy (K.E) is given by this formula;

$K.E = \frac{1}{2} MV^2$

<u>Note:</u> You'll have to calculate the velocity from the distance traveled by the car and photogate time in your experiment.

Based on the law of conservation of energy, we can deduce the following points:

Potential energy (P.E) is <u>highest</u> at the top of the loop while kinetic energy (K.E) is <u>lowest</u>.

Kinetic energy (K.E) is <u>highest</u> underneath the loop while potential energy (P.E) is <u>lowest</u>.

Read more on potential energy here: brainly.com/question/8664733

6 0

3 years ago

Can someone please help me on number 4......

saw5 [17]

mass/volume = density.

if bigger than water, sinks

less than water floats.

Archimedes' principle, floatation, icebergs etc

7 0

3 years ago

Read 2 more answers