Taking the copper wire, he has to wind it around the nail made of iron. After which, he then connect both ends of the copper wire to the battery, so an electric charge travels through the wire. This is the basic electromagnet. Since a current is now flowing through the wire, a magnetic field is produced. Placing the electromagnet near the mixture of copper and iron, the magnet should attract the pieces of iron, as iron is more magnetic compared to copper. This is done over a period of time, so that only the copper pieces are left in the mixture.
Answer:
The moon's orbit draws the oceans to it, which triggers ocean tides. Force produces stars and planets by gathering the mass from which it exists.
Explanation:
The moon's orbit draws the oceans to it, which triggers ocean tides. Force produces stars and planets by gathering the mass from which it exists.
Answer is above
<em><u>Hope this helps.</u></em>
E=mcθ
where E is the energy added,m is the mass,c is the specfic heat capacity and θ is the change in temprature.
making m subject u get E/c<span>θ=m
</span><span>θ=(30-20)=10</span><span>
plugging the values we get :
</span>

<span>
solving it we get the answer that is 0.25kg or 250 grams
</span>
One is when you are measuring a distance in space! I don't know the other but hope you find another example!
Answer:
The frequency of this photon is 
(D) is correct option.
Explanation:
Given that,
Excited states,

We need to calculate the wavelength
Using formula for energy





We need to calculate the frequency
Using formula of frequency


Where, E =energy


Hence, The frequency of this photon is 