Hope this helps you.
Two students are talking in the corridor you can hear them in your class but you cannot see them why?
1 answer:
You can hear two students talking in the corridor first, then see them due to the speed of sound.
The speed of sound is the distance that sound energy will propagate per unit of time through a medium. At room temperature, the speed of sound in air is about 1125 ft/s (343 m/s).
The speed of sound varies from substance to substance in function of the material density, elasticity and temperature. Typically sound travels most slowly in gases (like air 343 m/s), faster in liquids (like water 1481 m/s) and fastest in solids (like iron 5120 m/s).
<h3>What is velocity?</h3>It is a physical quantity that indicates the displacement of a mobile per unit of time, it is expressed in units of distance per time, for example (miles/h, km/h).
Learn more about velocity at: brainly.com/question/3004254
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If the net force on a block is zero, the block will move at constant velocity
Explanation:
We can answer this question by applying Newton's second law of motion, which states that the net force on an object is equal to the product between its mass and its acceleration:
(1)
where
is the net force on the object
m is its mass
a is its acceleration
In this problem, we have a block, and the net force on it is zero:
According to eq.(1), this also implies that
So, the acceleration of the block is zero.
However, acceleration is the rate of change of velocity of a body:
where is the change in velocity in a time of
. Since the acceleration is zero, this means that
, and therefore the velocity of the object is constant.
Learn more about Newton's second law:
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