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2 years ago

The atomic number of magnesium is 12. This means that its nucleus must contain

Physics

1 answer:

nasty-shy [4]2 years ago

5 0

12 protons in the nucleus

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If the sun in 148 million kilometers from the earth, how many minutes will it take the light from the sun to reach the earth?

Natasha2012 [34]

Answer:

about 8 mins and 20 secs

Explanation:

8 0

3 years ago

A source produces 20 crests and 20 troughs in 4 seconds. The second crest is 3 cm away from the first crest.Calculate :

sineoko [7]

Answer:

Solution given:

No of waves[N] =20crests & 20 troughs

=20waves

Time[T]=4seconds

distance[d]=3cm=0.03m

Now

Wave length=3cm=3 × ${10}^{ - 2}m$

Frequency= $\frac{No of waves}{time}$

= $\frac{20}{4}$ =5Hertz

and

Wave speed:wave length×frequency=3 × ${10}^{ - 2}m$ ×5=1.5 × ${10}^{ - 1} \tt{ {ms}^{ - 1}}$ .

3 0

2 years ago

Gina is driving her car to work, but she’s stopped at a red light. When the light turns green, she presses the gas pedal and acc

Vlad [161]

Since car is initially at rest so at that position the net force on car in vertical as well as horizontal both direction is zero

but after lights are green the car will speed up in horizontal direction

so now we can say that

It will accelerate in horizontal direction

So now as per Newton's formula we have

$F = ma$

so now the force in horizontal direction will become nonzero while in vertical direction car is still in equilibrium

So now we can say

$F_x = ma$

$F_y = 0$

so the correct answer will be

C. The net force on the car is greater than zero in the horizontal direction.

4 0

3 years ago

Explain how the zodiacal constellations are different from the other constellations.

Temka [501]

Answer:

They lie on the Ecliptic (apparent path of the Sun around Earth)

Explanation:

There are total 88 constellations in the sky out of which only 12 are considered as zodiacal constellations or Sun signs. This is because these are the constellations which lie on the Ecliptic.

Ecliptic is the apparent path of Sun around the Earth.

In other words, it can be said that the Sun appears to reside in 12 constellations throughout the year as the Earth revolves around it.

6 0

3 years ago

Meters Per second squared Jane runs a 100 meters race in 8seconds. What was her average speed ??

rusak2 [61]

The answer is B hope this helps

4 0

2 years ago