Answer:
Explanation:
specific gravity of oil is 
we know that
change in pressure for oil is given as
here density and h is for oil
change in pressure for WATER is given as
here density is for water and h is for water
pressure change due to both is given as
Haven't taken physics but I would assume if her friend is standing in front of her that you would add up the speeds and get 30 km/hr.
Answer:
6
Explanation:
because if 3kg is 8m/s then 16 divided by 2 is 8 means add 3 to 3 and get the final answer
Answer:
(C) The frequency decrease and intensity decrease
Explanation:
The Doppler effect describes the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source, or the wave source is moving relative to the observer, or both.
if the observer and the source move away from each other as is the case for this problem, the wavelength heard by the observer is bigger.
The frequency is the inverse from the wavelength, so the frequency heard will increase.
The sound intensity depends inversely on the area in which the sound propagates. When the buzzer is close, the area is from a small sphere, but as the buzzer moves further away, the wave area will be from a larger sphere and therefore the intensity will decrease.
