What is happening to the earth's field right now.

What is a medum and why do waves travel through them?

bearhunter [10]

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.

6 0

3 years ago

The element oxygen forms molecules that each contain two oxygen atoms. The elements carbon and oxygen form molecules that each c

disa [49]

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.

5 0

4 years ago

Air enters a turbine operating at steady state at 8 bar, 1400 K and expands to 0.8 bar. The turbine is well insulated, and kinet

vladimir2022 [97]

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

$\frac{T_2}{T_1} = (\frac{P_2}{P_1})^{(\frac{\gamma-1}{\gamma})}$

Where

$T_1 =$ Temperature at inlet of turbine

$T_2 =$ Temperature at exit of turbine

$P_1 =$ Pressure at exit of turbine

$P_2 =$ Pressure at exit of turbine

The steady flow Energy equation for an open system is given as follows:

$m_i = m_0 = m$

$m(h_i+\frac{V_i^2}{2}+gZ_i)+Q = m(h_0+\frac{V_0^2}{2}+gZ_0)+W$

Where,

m = mass

$m_i$ = mass at inlet

$m_0$ = Mass at outlet

$h_i$ = Enthalpy at inlet

$h_0$ = Enthalpy at outlet

W = Work done

Q = Heat transferred

$V_i$ = Velocity at inlet

$V_0$ = Velocity at outlet

$Z_i$ = Height at inlet

$Z_0$ = Height at outlet

For the insulated system with neglecting kinetic and potential energy effects

$h_i = h_0 + W$

$W = h_i -h_0$

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

$\frac{T_2}{T_1} = (\frac{P_2}{P_1})^{(\frac{\gamma-1}{\gamma})}$

$\frac{T_2}{1400K} = (\frac{0.8bar}{8nar})^{(\frac{1.4-1}{1.4})}$

$T_2 = 725.126K$

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:

$W = h_i -h_0$

$W = C_p (T_1-T_2)$

$W = 1.005(1400-725.126)$

$W = 678.248kJ/Kg$

Therefore the maximum theoretical work that could be developed by the turbine is 678.248kJ/kg

5 0

4 years ago

If a metal ball of mass 45kg is released at a height of 50m with acceleration due to gravity of 1.66m/s^2 then how much time wil

Yuki888 [10]

Answer:

t = 7.76sec

Explanation:

t²=(2s)/a

t²=(2 x 50)/1.66

t²=60.24

t=√60.24

t=7.76sec

3 0

3 years ago

Mary is traveling at a speed of 35 m/s sees a squirrel run across the road in front of her and slams on the brakes. Four seconds

Simora [160]

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, $a=\frac{dv}{dt}$

v- means velocity .

calculations-

a=35/4

a=8.75m/s²

To find out about acceleration -

<u>brainly.com/question/22935373</u>

#SPJ4

5 0

1 year ago