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4 years ago

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

2 answers:

5 0

Question 1
Answer: There are both magnetic north and south poles.

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

Question 4
Answer: Aluminium

Question 5
Answer: an iron nail

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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A circuit has a current of 1.2 A. If the voltage decreases to one-third of its original amount while the resistance remains

beks73 [17]

G 3.6A I think so try this answer

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3 years ago

If y=5sin (3x -40) Calculate the frequency and period

ioda

Answer:

0.477 Hz

2.09 s

Explanation:

y = A sin(ωx − φ)

A is the amplitude, ω is the angular frequency, and φ is the phase shift.

ω = 3 rad/s

f = ω / 2π ≈ 0.477 Hz

T = 1/f ≈ 2.09 s

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3 years ago

What is the overall force if there are 45N to the left and 30N to the right?

soldi70 [24.7K]

Answer:

15N

Explanation:

6 0

3 years ago

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:

$t=\frac{d}{v}$

where

d is the distance to cover

v = 340 m/s is the speed of sound in air

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

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

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3 years ago

The fact that there are seasons on the earth is largely due to

Andrews [41]

The main reason Earth have Seasons it's because of the Earth tilt. One side would be tilted to the sun which causes summer and the other side would be tilted away whitch causes Winter.

The S side of Earth for example is face to the sun which is summer

The N side of Earth of pointed away which is winter.

Message me if you need more help

3 0

4 years ago