Answer:
potential energy
kinetic energy
thermal energy
Explanation:
The book's potential energy can be released by knocking it off the table. As the book falls, its potential energy is converted to kinetic energy. When the book hits the floor this kinetic energy is converted into heat and sound by the impact.
Answer:
When they are approaching each other

When they are passing each other

When they are retreating from each other
Explanation:
From the question we are told that
The velocity of car one is 
The velocity of car two is 
The frequency of sound from car one is 
Generally the speed of sound at normal temperature is 
Now as the cars move relative to each other doppler effect is created and this can be represented mathematically as
![f_a = f_o [\frac{v \pm v_o}{v \pm v_s} ]](https://tex.z-dn.net/?f=f_a%20%3D%20f_o%20%5B%5Cfrac%7Bv%20%5Cpm%20v_o%7D%7Bv%20%5Cpm%20v_s%7D%20%5D)
Where
is the velocity of the source of sound
is the velocity of the observer of the sound
is the actual frequence
is the apparent frequency
Considering the case when they are approaching each other
![f_a = f_o [\frac{v + v_o}{v - v_s} ]](https://tex.z-dn.net/?f=f_a%20%3D%20f_o%20%5B%5Cfrac%7Bv%20%2B%20%20v_o%7D%7Bv%20-%20%20v_s%7D%20%5D)


Substituting value
![f_a = 2100 [\frac{343 + 7.22}{ 343 - 13} ]](https://tex.z-dn.net/?f=f_a%20%3D%202100%20%20%5B%5Cfrac%7B343%20%2B%20%207.22%7D%7B%20343%20%20-%20%2013%7D%20%5D)

Considering the case when they are passing each other
At that instant

![f_a = f_o [\frac{v }{v } ]](https://tex.z-dn.net/?f=f_a%20%3D%20f_o%20%5B%5Cfrac%7Bv%20%7D%7Bv%20%7D%20%5D)

Substituting value

Considering the case when they are retreating from each other
![f_a = f_o [\frac{v - v_o}{v + v_s} ]](https://tex.z-dn.net/?f=f_a%20%3D%20f_o%20%5B%5Cfrac%7Bv%20-%20%20v_o%7D%7Bv%20%2B%20%20%20v_s%7D%20%5D)

Substituting value
Answer:
Soory
Explanation:
I really dont know but i will send you wait
Answer:
C. The change of internal energy of a system is the sum of work and heat spent on it.
Explanation:
The law of conservation of Energy states that energy cannot be destroyed but can only be converted or transformed from one form to another. Therefore, the sum of the initial kinetic energy and potential energy is equal to the sum of the final kinetic energy and potential energy.
Mathematically, it is given by the formula;
Ki + Ui = Kf + Uf .......equation 1
Where;
Ki and Kf are the initial and final kinetic energy respectively.
Ui and Uf are the initial and final potential energy respectively.
The law of conservation of Energy is another way to describe the law of Thermodynamics. It states that the change of internal energy of a system is the sum of work and heat spent on it.
Mathematically, it is given by the formula;
ΔU = Q − W
Where;
ΔU represents the change in internal energy of a system.
Q represents the net heat transfer in and out of the system.
W represents the sum of work (net work) done on or by the system.
To solve this problem it is necessary to apply the kinematic equations of motion and Hook's law.
By Hook's law we know that force is defined as,

Where,
k = spring constant
x = Displacement change
PART A) For the case of the spring constant we can use the above equation and clear k so that




Therefore the spring constant for each one is 11876.92/2 = 5933.46N/m
PART B) In the case of speed we can obtain it through the period, which is given by

Re-arrange to find \omega,



Then through angular kinematic equations where angular velocity is given as a function of mass and spring constant we have to




Therefore the mass of the trailer is 4093.55Kg
PART C) The frequency by definition is inversely to the period therefore



Therefore the frequency of the oscillation is 0.4672 Hz
PART D) The time it takes to make the route 10 times would be 10 times the period, that is



Therefore the total time it takes for the trailer to bounce up and down 10 times is 21.4s