Answer:
2f
Explanation:
The relationship between the speed of a sound wave (v), its frequency (f) and its wavelength is
For the first wave speed, we have
(1)
Since the speed of a sound wave depends only on the medium, we can say that the second wave travels at same speed v (because it is still travelling in air, as the first wave). The wavelength of the second wave is , so if we call its frequency f', the new equation is
(2)
And if we equate (1) and (2), we find
Answer:
Below
Explanation:
You can use this formula to find the time it will take the driver :
finalvelocity = initialvelocity + acceleration (time)
Just plug in the values and rearrange :
6.94 m/s = 0 m/s + 1.5m/s^2 (t)
6.94 m/s = 1.5m/s^2 t
4.6366 s = t
Therefore it takes the driver 4.6 seconds to accelerate to 25 km/h
Hope this helps! Best of luck <3
750ml=0,75l.................
Answer:
98J
Explanation:
Given parameters:
Mass of rock = 5kg
Height = 2m
Unknown:
Work done = ?
Solution:
The amount of work done is given as:
Work done = Force x distance
Work done = Weight x height
Work done = mgH
Now insert the parameters and solve;
Work done = 5 x 9.8 x 2 = 98J
<span>C. As a metal comb is held near an object with a negative charge, the comb becomes charged.
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