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vodomira [7]
4 years ago
13

20 points+ brainiest!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Physics
2 answers:
sergejj [24]4 years ago
5 0
<span>Question 1
Answer: There are both magnetic north and south poles.

</span><span>QUESTION 2
Answer: Electric charges must come in pairs—one positive and one negative.

Question 4
Answer: Aluminium

Question 5
Answer: an iron nail</span>
svlad2 [7]4 years ago
5 0

Answer:

Q1: There are both magnetic north and south poles.

Q2: Magnetic domains must come in pairs—one north and one south.

Q4: Aluminium

Q5: An iron nail

Explanation:

Q1: A magnet always has two poles. So, our earth has also two poles. One pole is north and the other is south.

Q2: Electric charge may be isolated but magnetic domains always have two poles.

Q4: Aluminium is not a magnetic substance, so it cannot be made into a magnet.

Q5: Iron is a magnetic material, so it can be made into magnet.

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ioda

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Explanation:

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What is the overall force if there are 45N to the left and 30N to the right?
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Read 2 more answers
An important news announcement is transmitted by radio waves to people who are 82 km away, sitting next to their radios, and by
Viktor [21]

Answer:

13.5 ms

Explanation:

The sound wave travels with uniform motion in both cases, so the time taken to cover a distance d is given by:

t=\frac{d}{v}

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So for the people across the newsroom,

d = 4.7 m

So the time taken is

t=\frac{4.7}{340}=0.0138 s = 13.8 ms

The radio waves instead travels with uniform motion at the speed of light:

c=3.0\cdot 10^8 m/s

So the time taken for them is

t=\frac{d}{c}

where

d = 82 km = 82,000 m

is the distance of the people who are 82 km away. Substituting,

t=\frac{82,000}{3.0\cdot 10^8}=0.27\cdot 10^{-3} s = 0.27 ms

Therefore, the difference in time is

\Delta t = 13.8 ms - 0.27 ms = 13.5 ms

4 0
3 years ago
The fact that there are seasons on the earth is largely due to
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