Answer:
(A) W fric > 0
Explanation:
According to the law of energy conservation, mechanical energy stays always constant. So if the ball come back to the same position (same potential energy) but with reduced speed (kinetic energy), then the kinetic energy has been affected by friction work created by air resistance. This work is non 0 and larger than 0. So the total of this friction work and kinetic energy after the fall = kinetic energy before the fall.
The medium through which sound travels inside a bird’s body is the air. This is further explained below.
<h3>What is Air?</h3>
Generally, Air is simply defined as the invisible combination of gases, and this gas exists around the Earth.
In conclusion, Sound wave allows birds to communicate.
Read more about sound
brainly.com/question/14595927
#SPJ1
Answer:
what is your question
Explanation:
I dont see where you are asking a question be specific lol
: )
Answer:
0.5kg
Explanation:
Given parameters:
Potential energy = 147J
Height = 30m
Unknown:
Mass of the bird = ?
Solution:
Potential energy is the energy due to the position of a body. Now, the expression for finding the potential energy is given as;
P.E = mgH
m is the mass
g is the acceleration due to gravity = 9.8m/s²
H is the height
147 = m x 9.8 x 30
m = 0.5kg
K.E = ½ mv²
Explanation:
The formula of Kinetic Energy
K.E = ½ mv²
Where,
m = mass of object
v = velocity of object
The <u>Standard Unit</u> of kinetic energy is <u>Joule</u>, while the <u>Imperial Unit</u> of kinetic energy is <u>foot-pound</u>
<u>-TheUnknown</u><u>Scientist</u>
