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Daniel [21]
3 years ago
5

The electric force between two charges A. increases with distance between the charges B. increases if either one of charges gets

larger C. increases only if both charges get larger simultaneously D. indicates that the charges have opposite sign qE. none of the above
Physics
1 answer:
beks73 [17]3 years ago
6 0

Answer:

Option (A) , (b) and (d) are correct option

Explanation:

According to Coulomb's law electric force between two charges is given by

F=\frac{1}{4\pi \epsilon _0}\frac{q_1q_2}{r^2}

From the relation we can say that force is directly proportional to magnitude of charges and inversely proportional to distance between them '

So if we increase the distance then force will decrease

Increase if any of the charge get larger

If force is attractive then both the charge will be of different sign and is force is repulsive then both the charges of same sign

From above conclusion we can say that (a), (b) and (d) are correct option

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Group 7A of the periodic table contains the?
olga2289 [7]

The correct answer is A. Most reactive non metals.

Firstly if some one knows how to read the periodic table he would have no confusion in deciding whether group 7 has metals or non metals. Group 7 contains non metals so basically we can easily cancel out two options of metals.

Secondly group 7 non metals are the most reactive non metals as they need only one electron in order to complete their valence shell and become stable.


4 0
3 years ago
Read 2 more answers
Calculate the entropy change that occurs when 1.0kg of water at 20.00 C is mixed with 2.0kg of water at 80.00 C
SOVA2 [1]

Answer:

The change in entropy ΔS = 0.0011 kJ/(kg·K)

Explanation:

The given information are;

The mass of water at 20.0°C = 1.0 kg

The mass of water at 80.0°C = 2.0 kg

The heat content per kg of each of the mass of water is given as follows;

The heat content of the mass of water at 20.0°C = h₁ = 83.92 KJ/kg

The heat content of the mass of water at 80.0°C = h₂ = 334.949 KJ/kg

Therefore, the total heat of the the two bodies = 83.92 + 2*334.949 = 753.818 kJ/kg

The heat energy of the mixture =

1 × 4200 × (T - 20) = 2 × 4200 × (80 - T)

∴ T = 60°C

The heat content, of the water at 60° = 251.154 kJ/kg

Therefore, the heat content of water in the 3 kg of the mixture = 3 × 251.154 = 753.462

The change in entropy ΔS = ΔH/T = (753.818 - 753.462)/(60 + 273.15) = 0.0011 kJ/(kg·K).

8 0
3 years ago
These graphs show measurements of the density of air as different sound waves pass a single point.
Ymorist [56]

Answer: D!

It is the option with the greatest amplitude.

5 0
4 years ago
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Which type of radiation on the electromagnetic spectrum has the greatest energy and why?
nika2105 [10]

Answer:

Gamma rays

Explanation:

Have the highest energies. The shortest wavelengths, and the highest frequencies.

4 0
3 years ago
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Your friend is catching a falling basketball after it has passed through the basket. Her hands move straight down while catching
Vaselesa [24]

Answer:F=29 N    

Explanation:

Given

time t=0.1 s

mass of ball m=0.6 kg

distance moved before coming to stop d=1.2 m

Net Force exerted

F=\frac{\Delta P}{\Delta t}

F=\frac{m\Delta v}{\Delta t}

F=\frac{m\sqrt{2gd}}{\Delta t}

F=\frac{0.6\cdot \sqrt{2\cdot 9.8\cdot 1.2}}{0.1}

F=\frac{0.6\cdot 4.849}{0.1}

F=\frac{2.90}{0.1}

F=29 N    

7 0
4 years ago
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