Answer:
He crawled.
Explanation: He crawled with the strength he gained from a leaf.
Answer:
In summary kinetic energy is not necessary
Explanation:
In this problem we are asked to indicate what type of energy does not need to be considered.
As they indicate that the masses do not move, scientific energy is defined by
K = ½ m v²
Since the velocities of the mass are zero, this energy is zero, so it is not necessary to take them into account in our analyzes.
In summary kinetic energy is not necessary
Answer:
Mechanical waves are defined by which of the following?
C. All of the above
Since, mechanical waves are created when an energy source vibrates, and they carry energy from one place to another through a medium, this is the right option.
Mechanical waves need an energy source to produce them?
True because a mechanical wave needs an initial energy input.
A wave has a wavelength of 100 mm and a frequency of 6 Hz. What is its speed?
600 mm/s
Wave speed = wavelength X frequency
Wave speed = 100 X 6
Wave speed = 600 mm/s
Amplitude of a wave is?
B. How high the wave is from resting point
By definition of amplitude.
<u>Answer:
</u>
Maximum height reached by the ball thrown up at 30m/s is 3.06 seconds and the height reached is 45.9 meters
<u>Explanation</u>:
Given:
Initial velocity
To find :
maximum height =?
time taken=?
Solution:
<em>Step 1:Finding the time taken to reach the highest point</em>:
The velocity of the ball at its highest ,final velocity v=0
Using the formula,
Where a is acceleration due to gravity.Its value is
Substituting the values:
<em>Step 2: finding the highest point
</em>
Using the formula
where
s is the maximum highest.
Substituting values
Result:
Thus the maximum height reached is 45.9 meters in 3.06 seconds
The force of gravity between them increases.
