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SVETLANKA909090 [29]
3 years ago
10

The valence of aluminum is +3, and the valence of chlorine is –1. The formula for aluminum chloride is correctly written as A. A

l3Cl. B. Cl3Al. C. ClAl3. D. AlCl3.
Physics
1 answer:
zzz [600]3 years ago
7 0
The correct answer is D actually
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A student tries to produce notes of higher frequency by blowing a trumpet harder. he will succeed?​
sdas [7]

Answer:

Please mark as Brainliest!!

Explanation:

He will not succeed as it blows the trumpet harder that only increase the amplitude of the sound wave that means the intensity of the sound will increase but the frequency remains the same.

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2 years ago
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The distance between the crests of waves
stepladder [879]
It depends, You have to have the length and the width of the crest wave.
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A skateboarder is moving 5.25 m/s when he starts to roll up a frictionless hill. How much higher is he when his velocity has red
Taya2010 [7]
Mechanical energy E = mgh + 1/2mv²

When he starts, let h = 0 ⇒ E₁ = 1/2mv₁²
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Without friction, energy is conserved at all times.

E₁ = E₂
     ↓
1/2mv₁² = mgh + 1/2mv₂²
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3 years ago
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Determine the change in electric potential energy of a system of two charged objects when a -2.1-C charged object and a -5.0-C c
elena55 [62]

Answer:

Change in electric potential energy ∆E = 365.72 kJ

Explanation:

Electric potential energy can be defined mathematically as:

E = kq1q2/r ....1

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q1 = charge 1 = -2.1C

q2 = charge 2 = -5.0C

∆r = change in distance between the charges

r1 = 420km = 420000m

r2 = 160km = 160000m

From equation 1

∆E = kq1q2 (1/r2 -1/r1) ......2

Substituting the given values

∆E = 9.0×10^9 × -2.1 ×-5.0(1/160000 - 1/420000)

∆E = 94.5 × 10^9 (3.87 × 10^-6) J

∆E = 365.72 × 10^3 J

∆E = 365.72 kJ

6 0
3 years ago
Ondas de agua en un plato poco profundo tienen 6
castortr0y [4]
I don’t speak Spanish sorry
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3 years ago
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