A medium is a substance or material that carries the wave. Sounds waves need a medium in order to travel through a wave to help it travel as it cannot travel through a vacuum. Mechanical waves need a medium to transport energy.
Answer:
The elements carbon and oxygen form molecules that each contain one carbon atom and two oxygen atoms is TRUE.
Explanation:
The elements carbon and oxygen form molecules that each contain one carbon atom and two oxygen atoms is true because a compound can only be formed from the combination of two or more elements but not from one element.
The molecule formed from one carbon element (C) and 2 oxygen elements (O) is CO2. CO2 which is known as carbon(IV)oxide is a compound which is made up of carbon and oxygen elements.
To solve this problem it is necessary to apply the concepts related to the adiabatic process that relate the temperature and pressure variables
Mathematically this can be determined as

Where
Temperature at inlet of turbine
Temperature at exit of turbine
Pressure at exit of turbine
Pressure at exit of turbine
The steady flow Energy equation for an open system is given as follows:


Where,
m = mass
= mass at inlet
= Mass at outlet
= Enthalpy at inlet
= Enthalpy at outlet
W = Work done
Q = Heat transferred
= Velocity at inlet
= Velocity at outlet
= Height at inlet
= Height at outlet
For the insulated system with neglecting kinetic and potential energy effects


Using the relation T-P we can find the final temperature:



From this point we can find the work done using the value of the specific heat of the air that is 1,005kJ / kgK
So:




Therefore the maximum theoretical work that could be developed by the turbine is 678.248kJ/kg
After 4 seconds the velocity function attains a=8.75m/s².
Given-
Velocity= 35m/s
time=4sec
To find out acceleration, we can understand the following-
Acceleration means rate of change of velocity.
In this question the velocity depreciates to zero i.e. the slope of the graph falls off with negative slope.
This value has negative impact on force as the resultant force is outcome of application of brakes where V=0 as time progresses.
Mathematically, 
v- means velocity .
calculations-
a=35/4
a=8.75m/s²
To find out about acceleration -
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