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telo118 [61]
3 years ago
8

Express the distance between the moon and earth in meters with a meter prefix (km).

Physics
2 answers:
valkas [14]3 years ago
5 0

Answer:

0.384 Gm

Explanation:

The average distance between the moon and earth is  384,400 km

Why average distance? Well, the Moon is not always the same distance from Earth, its orbit is not a perfect circle.  

Expressing this distance in meters we have:

384000km*\frac{1000m}{1km}=0.384*10^9m

Since 1 gigameter (Gm) is 10^9 m:

0.384*10^9m=0.384 Gm

tankabanditka [31]3 years ago
3 0

Answer;

= 3.86 × 10^8 Meters

Explanation;

-The distance between the Earth and the moon is 386000 km

But; 1 km = 1000 m

Therefore; 386000 km will be equivalent to;

= 386000 × 1000

= 386000000 m

= 3.86 × 10^8 meters

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The radar system of a navy cruiser transmits at a wavelength of 1.4 cm, from a circular antenna with a diameter of 2.7 m. At a r
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Answer:

Distance will be 49.34 m

Explanation:

We have given wavelength \lambda =1.4cm =0.014m

Diameter of the antenna d = 2.7 m

Range L = 7.8 km = 7800 m

We have to find the smallest distance hat two speedboats can be from each other and still be resolved as two separate objects D

We know that distance is given by D=\frac{L1.22\lambda }{d}=\frac{7800\times 1.22\times 0.014}{2.7}=49.3422m

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3 years ago
On February 15, 2013, Asteroid 2012 DA14 passed within 17,200 miles [mi] of the surface of the Earth at a relative speed of 7.8
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Answer:

The total amount of energy that would have been released if the asteroid hit earth = The kinetic energy of the asteroid = 1.29 × 10¹⁵ J = 1.29 PetaJoules = 1.29 PJ

1 PJ = 10¹⁵ J

Explanation:

Kinetic energy = mv²/2

velocity of the asteroid is given as 7.8 km/s = 7800 m/s

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Density = specific gravity × 1000 = 3 × 1000 = 3000 kg/m³

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Volume = 4π(15)³/3 = 14137.2 m³

Mass of the asteroid = density × volume = 3000 × 14137.2 = 42411501 kg = 4.24 × 10⁷ kg

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Which of the following is NOT true of fusion?
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