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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A rock is tossed straight up from the ground with a speed of 21 m/s . When it returns, it falls into a hole 10 m deep.a.) What i

Arte-miy333 [17]

(a) 25.2 m/s

Let's take the initial vertical position of the rock as "zero" (reference height).

According to the law of conservation of energy, the speed of the rock as it reaches again the position "zero" after being thrown upwards is equal to the initial speed of the rock, 21 m/s (in fact, if there is no air resistance, no energy can be lost during the motion; and since the kinetic energy depends only on the speed of the rock:

$K=\frac{1}{2}mv^2$

and the gravitational potential energy of the rock has not changed, since the rock has returned into its initial position, it means that the speed of the rock should be the same)

This means that we can only analyze the final part of the motion, the one in which the rock falls into the 10 m hole. Since it is a free fall motion, we can find the final speed by using

$v^2 = u^2 + 2gd$