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BabaBlast [244]
3 years ago
13

Why might an electromagnet be used to pick up old cars in junkyards?

Physics
2 answers:
siniylev [52]3 years ago
7 0
B) Hope it helps ,Have a nice day :)
Law Incorporation [45]3 years ago
6 0
<h3><u>Answer;</u></h3>

B) Electromagnets are powerful and can be turned on and off easily.

<h3><u>Explanation;</u></h3>
  • <em><u>Electromagnets are made by winding a wire through a magnetic material such as soft iron core making a coil, and then passing electric current through the coil thus making the soft iron core magnetic.</u></em>
  • The strength of the electromagnet depends on the number of coils and also the size of the electric current through the coil.
  • <em><u>Its advantageous to use electromagnets as compared to using permanent magnets since they are powerful and can be turned on and off easily and also the strength of the electromagnet can be easily adjusted by regulating the amount of current flowing through the coils. </u></em>



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A modern compact fluorescent lamp contains 1.4 mg of mercury (Hg). If each mercury atom in the lamp were to emit a single photon
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Answer:

A. 1.64 J

Explanation:

First of all, we need to find how many moles correspond to 1.4 mg of mercury. We have:

n=\frac{m}{M_m}

where

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Mm = 200.6 g/mol is the molar mass of mercury

Substituting, we find

n=\frac{0.0014 g}{200.6 g/mol}=7.0\cdot 10^{-6} mol

Now we have to find the number of atoms contained in this sample of mercury, which is given by:

N=n N_A

where

n is the number of moles

N_A=6.022\cdot 10^{23} mol^{-1} is the Avogadro number

Substituting,

N=(7.0\cdot 10^{-6} mol)(6.022\cdot 10^{23} mol^{-1})=4.22\cdot 10^{18} atoms

The energy emitted by each atom (the energy of one photon) is

E_1 = \frac{hc}{\lambda}

where

h is the Planck constant

c is the speed of light

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Substituting,

E_1 = \frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^8 m/s)}{5.08\cdot 10^{-7} m}=3.92\cdot 10^{-19} J

And so, the total energy emitted by the sample is

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Answer:

C) Pressure will compress a gas, reducing its volume and giving it a greater density and concentration of particles.

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At constant temperature, pressure and volume are inversely related.

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As we know, with decrease in volume, density increases.

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