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stealth61 [152]
2 years ago
6

Which statement best describes a chemical reaction?​

Physics
2 answers:
S_A_V [24]2 years ago
7 0

Answer:

a chemical reaction is a reaction that happens between two objects, like fire and a potion in chemistry

Explanation:

the reason is that the the fire causes the chemical to react, making a chemical reaction

ehidna [41]2 years ago
3 0
A chemical changing
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What is the half-life of an isotope that decays to 25% of its original activity in 70.8 hours?
loris [4]
Are there any options?
8 0
3 years ago
Which tuning forks will give rise to a beat frequency of 20 Hz when sounded together with a 240 Hz tuning fork?
Lubov Fominskaja [6]

Use the concept of beat frequency to find the applicable final freqeuncy for 20Hz beat frequency.

Beat can be defined as 'the interference pattern between two sounds of slightly different frequencies0

The expression for beat frequency is given as

f_{beat} = |f_1-f_2|

Where,

f_2 = Final frequency

f_1 = Initial frequency

The beat frequency for us is 25Hz and the initial frequency is 240Hz, then

20= |f_2-240|

Being an absolute value, two values are possible, both in addition and subtraction:

f_2 = 240 \pm 20

The two possible values are

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3 0
3 years ago
It has been observed that electrical connectors manufactured by Jolt Electrical Supply Company last an average of 18.2 months an
Viktor [21]

Answer:

Jolt can expect to replace 160 units.

Explanation:

given data:

standard deviation 1.7

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number of connectors = 5000

z(19) = \frac{(19-18.2)}{1.7}

z(19)  = 0.4706

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P(x< 19) = 0.6810   from z table

therefore 68.1% fails within 19 months.

hence 0.3190   {100-68.1} will fail during that period.

number of unit of Jolt that need to be replace, on average is  0.319*500 = 160 units.

7 0
3 years ago
Why do hurricanes develop over oceans?
VARVARA [1.3K]

My guess is; The warmer ocean adds water vapor to the air mass.

I'm really sorry if I'm wrong

6 0
3 years ago
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Hot air has a lower density than the surrounding atmosphere, therefore,it will rise.. The reason it is "cold" in the upper atmosphere is actually because of a lower air density.
5 0
3 years ago
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