Answer:
Explanation:
velocity of source, Vs = 114 m/s
original frequency, f = 3.65 kHz
velocity of observer , Vo = 0 m/s
velocity of sound, v = 334 m/s
let the frequency is f'.
The formula for the doppler effect is given by
where, v is the velocity of sound.
f' = 5.54 kHz
The answer is C. because the lines will look the same as the earths gravity field (you can look up a graph)
Answer : The correct option is, (D) Surface tension is caused by cohesion between water molecules on the surface.
Explanation :
Surface tension : It is caused by the cohesion between water molecules on the surface or we can say that it is a tension of the surface of liquid caused by the attraction of the particles which are present on the surface layer by the bulk of the liquid, which tends to minimize surface area.
And due to the surface tension phenomena the shape of the water molecule tend to assume a spherical shape to attain the minimum surface area.
Hence. the correct option is, (D) Surface tension is caused by cohesion between water molecules on the surface.
The variable is qualitative,
the quantitative variables are those that can be specified by a numeric value.
Answer:
Both the technicians B is correct.
Explanation:
For delicate work on circuit boards the soldering iron is suitable for working because it has various sizes of iron light is weight and applies no almost force on the work piece. Whereas the solder gun forces the molten filling solder on to the work piece.
The soldering torch directly releases flame on the work piece and produces high heat so it heats the work piece faster. While a soldering iron heats up slowly and uniformly.