It must have a medium. It must travel in empty space. Mechanical waves are waves which needs medium of propogation.
Answer:
D. if it is dark, then an owl will find a mouse by the sound the mouse makes
Answer:
IT doesnt push down because the lawnmower has wheels and the ground is hard
Explanation:
Branliest
Answer:
Q = 913.9 gpm
Explanation:
The Hazen Williams equation can be written as follows:

where,
P = Friction Loss per foot of pipe =
= 4 x 10⁻⁴
Q = Flow Rate in gallon/min (gpm) = ?
d = pipe diameter in inches = (400 mm)(0.0393701 in/1 mm) = 15.75 in
C = roughness coefficient = 100
Therefore,

<u>Q = 913.9 gpm</u>
They will hit the ground at the same time, as mass is negligible when calculating the acceleration of gravity when there is no air resistance