Answer:
See the explanation.
Explanation:
The speeds of sound depend upon the temperature of the medium. As the temperature increased in the afternoon, the speed of sound increases. Then the time taken by reflected sound will be less than 0.1 sec in the afternoon. And to hear an echo the time gap between an original sound and reflected sound must be at least 0.1 sec. That is why the student could not hear the echo at all in the afternoon.
Answer:
C
Explanation:
Diagram C is the correct answer, because the ball is at the point with the highest height relative to the ground, in this way all the kinetic energy has been transformed into potential energy.
We must remember that potential energy is defined as the product of mass by gravity by height
Ep = m*g*h
where:
m = mass [kg]
g = gravity acceleration [m/s²]
h = elevation [m]
So when we have a great value for h in the above equation, we will have a big value for potential energy.
The independent variable is b the amount of chores you do
I think it is building and managing of irrigation systems
Answers:
A) 0.204 m
B) 0.285 s
Explanation:
<h2>Answer A:</h2>
This described situation is free fall, this means the initial velocity of the fly is zero, and the equation that will be used is:
(1)
Where:
is the final height of the fly
is the initial height of the fly
is the initial velocity of the fly
is the time
is the acceleration due to gravity
(2)
(3) This is the distance at which the fly would begin to beat its wings
<h2>Answer B:</h2>
In this part we will also use equation (1), but we will find the time:
(1)
Where:
is the final height of the fly
is the initial height of the fly
is the initial velocity of the fly
is the time we need to find
is the acceleration due to gravity
(4)
Isolating :
(5)
(6) This is the time it would take for a fly to hit the bottom of the box
