The answer is:
Transverse dune
The explanation:
Transverse dune : is abundant barchan dunes It may merge into barchanoid ridges, which then grade into linear .
The transverse dunes is called that because they lie transverse, or across, the wind direction, with the wind blowing perpendicular to the ridge crest.
It is large, very asymmetrical, elongated dune lying at right angles 90° to the prevailing wind direction.
Transverse dunes have a gently sloping windward side and a steeply sloping leeward side.
They general form in areas of sparse vegetation and abundant sand are transverse dunes.
It brings cold water from the bottom of the ocean.
Answer:
a) 3000 Hz;
b) 30 dB;
c) 1000 times.
Explanation:
a) From the human audiogram given on the figure below the black line represents the threshold for hearing the sound at each frequency. We see that the least intensity is necessary for the frequency of about 3000 Hz.
b) Using the same audiogram we see that we would need the sound of the intensity of about 30dB.
c) The least perceptible sound at 1000 Hz must be 0dB while at 100 Hz it is 30dB. These are logarithmic quantities. To transform them to the linear quantities we use the formula
where 
is the hearing threshold at 1000 Hz.
Therefore we have the following
is the threshold at 1000Hz and 
is the threshold at 100Hz.
By exponentiating we have
Now dividing these two equations we get
Therefore, the least perceptible sound at 100Hz is 1000 times more intense than the least perceptible sound at 1000Hz.
Note: I got these values unisng the audiogram that is attached here. The one that you have might be slightly different and might yield different answers.
Answer:
There are three methods of energy transfer that we need to learn: conduction, convection, and radiation.
Conduction: Heat is thermal energy, and in solids it can be transferred by conduction. ...
Convection: Fluids, that is both gases and liquids, can transfer heat energy by convection. ...
Explanation:
1. The ball crosses the goal line 3. Trapping 4. Trapping 5. Shooting 6. Punting 7. Heading 8. Dribbling 9. Throw-in 10. Thigh Trap. I have no idea what number 2 is though, sorry about that one.
