Answer:
20 to 30
Explanation:
20 to 30 is the correct answer
Answer:
As a freely falling object picks up downward speed. What happens to the power supplied by the gravitational force? Does it increase, decrease or stay the same? The power will increase because (Power=work/time; work=f(d); and F x d/t; FV).
Explanation:
Answer:
4.32 kg.m/s
Explanation:
SInce the 2.4 kg stone is mobing at speed of 3.6m/s at an angle of 30 degree measured from the x+ direction toward y+ direction. Its y-component momentum is product of its velocity in the y-direction and its mass



Explanation:
Given that,
The range of human hearing extends from approximately 20 Hz to 20 000 Hz. We need to find the wavelengths of these extremes when the speed of sound in air is equal to 338 m/s.
Speed of any wave is given by :

is wavelength of wave
If f = 20 Hz

If f = 20000 Hz

The smallest wavelength that can be heard is 0.0169 m and the longest wavelength that can be heard is 16.9 m.