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suter [353]
3 years ago
15

Give the symbol for two halogens

Physics
1 answer:
Rama09 [41]3 years ago
5 0
F and Br are florine and bromine which are both halogens which can be easily identified on the second last group on the periodic table
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There are 640 acres in a square mile. how many square meters are there in 7.80 acres.
lukranit [14]

Answer:

On 7.8 acres there are 31565.3 square meters

7.8 acres = 31565.3 m²

Explanation:

Conceptual analysis

Acre, square mile and square meter are area units, so their equivalences are in square units.

Known data

1 (mi)² = 640 acres

1 mi = 1609.34 m

Problem development

We know that 1 mile = 1609.34m, then: (1 mile)² = (1609.34m)²=(1609.34)²m²

We apply the known conversion factors to calculate the square meters (X) in 7.8 acres:

X=7.8 acres *\frac{(1 mi)^{2} }{640 acres} * \frac{(1609.34)^{2}m^{2}  }{(1 mi)^{2} }

We eliminate acres and square miles (mi²) because they are in the numerator and denominator, so the answer is in square meters (m²)

X=31565.3 m²

On 7.8 acres there are 31565.3 square meters

7.8 acres = 31565.3 m²

8 0
3 years ago
Find the de Broglie wavelength of an electron whose speed is 1.0 x 10^7 m/s.
balu736 [363]

Answer:

7*10^(-11) m.

Explanation:

the details are in the attached picture (the answer is marked with red).

5 0
4 years ago
While chatting with her friend about their world history class, Susan was asked about her plans for the weekend. According to Fr
BigorU [14]
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8 0
4 years ago
An object moves from point A to B to C to D and finally to A
Nataly [62]

here's the solution,

The <em>radius</em> of the circle =<u> 3 km</u>

distance covered = <em>circumference</em> of the circle,

So, Circumference :

=》

2\pi r

=》

2 \times 3.14 \times 3

=》

18.84

(a). Distance covered by moving object is 18.84 km

(b). 0 km

now, Displacement of the object is 0 km, because displacement is the shortest distance from stating point to the destination, but the object returns back to the starting point, hence magnitude of displacement is 0.

5 0
3 years ago
An individual who has had chicken pox rarely gets this
marin [14]
This would be an example of active immunity
8 0
3 years ago
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