Answer:
The box will travel 1.2 [m]
Explanation:
This problem can easily be solved by using the principle of work and energy conservation which expresses that, when the particle moves from A1 to A2 under the action of an F force, the work of the F Force is equal to the change of the kinetic energy of the particle. The above is known as the principle of work and energy.
In the attached image we can see the conditions of this particular case, and we will analize each member of the equations deducted:
Kinetic energy (position 1):
Position 2 (work):
Principle of work and energy:
In the last equation we need to clear x, but first we need to find the value for the friction force, Therefore in the attached image we can find the study of forces in the y axis where we cand find the normal force, then knowing the friction factor we will determine the friction force.
Answer:
It will take for the lead car to stop.
Explanation:
<em>Stage 1</em>: The car moves at constant speed .
<em>Stage 2</em>: the car accelerates with (the negative sign means it's decelerating with respect to the direction is moving).
¿When will be the velocity be ?
From Kinematics:
So, if final velocity is
then,
⇒ ⇒ .
Answer: 355.66 m/s
Explanation:
Since sound is a mechanical wave, its speed varies with the medium and its properties, such as its temperature.
So, if we want to calculate the speed of sound in air at we can use the following equation that relates with the temperature:
(1)
Where:
is the Heat capacity ratio for air
is the Universal Gas constant
is the air temperature in Kelvin
is the air molar mass
(2)
Finally:
This is the speed of sound at 313 K
Survival of the fittest they are able to mature and reproduce because of their advantageous qualities
They correspond due to the fact that certain elements are grouped together based on the number of valence electrons on the outer shell of their electron configuration.
For instance, sulfur (S) has 6 electrons in the outer shell, as it is in the 6th group EXCLUDING transition metals (note, never take these into account, as their charge is always +2; a cation)