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3 years ago

A mirror cleaned with an alcohol solution is slightly colder ight after it is cleaned. Why?

1 answer:

7 0

A mirror cleaned with an alcohol solution is slightly colder right after it is cleaned because the alcohol remains left over the mirror absorbs the heat from the mirror, thereby taking all the heat energy to convert it into vapors.

Explanation

Alcohol solution having a lower boiling point(82 degree Celsius) than water vaporizes quickly than water, taking the heat from the surroundings.

This process in which a liquid state is converted to gaseous state or vapors at given pressure and temperature is called evaporation.

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What is the charge on an object that has 1.09x10^13 excess electrons?

Nadya [2.5K]

Answer:

$-1.74\cdot 10^{-6} C$

Explanation:

The electron is the particle that rotates around the nucleus of the atom; it has a negative electric charge equal to :

$e=-1.6\cdot 10^{-19}C$

which is known as fundamental charge.

For an object containing N excess electrons, the total charge of the object is

$Q=Ne$

In this problem, the number of excess electrons in the object is:

$N=1.09\cdot 10^{13}$

Therefore, by plugging it the numbers, we can find the value of Q, the total charge of the object:

$Q=(1.09\cdot 10^{13})(-1.6\cdot 10^{-19})=-1.74\cdot 10^{-6} C$

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4 years ago

Plzzzz HELLPPPPPP!!!!

Rainbow [258]

?? what’s the topic

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3 years ago

If the current in the circuit is 10.5 A,

sergiy2304 [10]

Answer:

E) 147 V

Explanation:

Ra+Rb+Rc = 14.0

V = IR

V = (10.5)(14.0)

V = 147 V

7 0

3 years ago

2. If a force is exerted on an object, which statement is true?

Katyanochek1 [597]

Answer:

A small force is applied over a long time interval can produce a large change in the object's momentum

Explanation:

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3 years ago

Why does a catalyst cause a reaction to proceed faster??

prohojiy [21]

The activation energy is lowered only
There are more collisions per second and the collisions are of greater energy
There are more collisions per second only
The activation energy is lowered

7 0

4 years ago

Read 2 more answers