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Alex
2 years ago
7

If a vector that is 3 cm long represents 30km/hr what velocity does a 5 cm long vector which is drawn using the same scale repre

sent
Physics
1 answer:
Alexxandr [17]2 years ago
7 0

Answer:

50 km /hr

Explanation:

30 is to 3     as    x is to 5

30/3 = x/5

5 (30/3) = 50 km/hr = x

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A very small source of light that radiates uniformly in all directions produces an electric field amplitude of 8.45 V/m at a poi
Mandarinka [93]

Answer:

4.43 kW

Explanation:

Since Intensity I = P/A = E²/2cμ₀ where P = Power, A = Area = 4πr² where r = distance from source = 61 m and E = electric field amplitude = 8.45 V/m.

P = E²A/2cμ₀ = E²4πr²/2cμ₀ = 2πE²r²/cμ₀

  = 2π(8.45 V/m)²(61 m)²/3 × 10⁸ m/s × 4π × 10⁻⁷ Tm/A

  = 4428.1 W

  = 4.4281 kW ≅ 4.43 kW

6 0
3 years ago
The self inductance relates the magnetic flux linkage to the current through the coil. Calculate the self inductance L in units
Katen [24]

Answer:

Self inductance, L=127\ \mu H

Explanation:

It is given that,

Length of the coil, l = 5 cm = 0.05 m

Area of cross section of the coil, A=3\ cm^2=0.0003\ m^2

Number of turns in the coil, N = 130

The self inductance relates the magnetic flux linkage to the current through the coil and it is given by :

L=\dfrac{\mu_oN^2A}{l}

L=\dfrac{4\pi \times 10^{-7}\times (130)^2\times 0.0003}{0.05}

L = 0.000127 Henry

or

L=127\ \mu H

So, the self inductance of the coil is 127 microhenry. Hence, this is the required solution.

6 0
4 years ago
A 0.45 kg ball is moving horizontally with a speed of 5.3 m/s when it strikes a vertical wall. The ball rebounds with a speed of
qaws [65]

Answer:

1.31Kgms-1

Explanation:

∆p = m∆v

Where:

∆p= change in momentum

m= mass of the ball

∆v= change in velocity of the ball= (5.3-2.4)= 2.9ms-1

Therefore, substituting appropriately with the values above:

∆p= 0.45×2.9= 1.31Kgms-1

6 0
4 years ago
Read 2 more answers
Why is it important that we learn about our solar system, the sun, and planets in our solar system other than Earth?
tangare [24]

Answer:

To understand all the different kind of elements and how they work. Nature is a beautiful thing and it is important we understand how they survive and how we can help. The solar system is a mandatory nature. Learning about other planets also helps us feel safe and more knowledgable.

8 0
3 years ago
What does waining mean?
Blizzard [7]

Answer:

(of the moon) have a progressively smaller part of its visible surface illuminated, so that it appears to decrease in size.

Explanation:

5 0
3 years ago
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