False only technology can show this not our naked eyes
Hope this helps and have a blessed day!
Answer:
the <em>revolutions per minute</em> for the 9 inch pulley is <em>10/9</em>.
Explanation:
Step 1:
The linear speed of the belt is
linear speed = circumference × revolutions per minute, that is
v = 2π r × ω
where
- r is the radius of the pulley
- ω is the revolutions per minute
Therefore, the linear speed of the 2 inch pulley is:
v₂ = (2π × 2 in) × (5 rev/min)
v₂ = 4π × (5 rev/min)
Step 2:
Compute the linear speed of the belt for the 9 inch pulley:
v₈ = (2π × 9 in) × (x rev/min)
v₈ = 18π × (x rev/min)
Step 3:
Since the linear speed is the same for both pulleys, therefore
v₂ = v₈
4π × (5 rev/min) = 18π × ω₈
ω₈ = (4π × (5 rev/min)) / 18π
<em>ω₈ = 10/9 rev/min</em>
Therefore, the <em>revolutions per minute</em> for the 8 inch pulley is <em>10/9</em>.
Complete Question
The complete question is is shown on the first uploaded
Answer:
The elastic potential energy at point B is 
The kinetic energy at point D is 
Explanation:
Looking at the given point we can observe that mechanically energy(i.e potential and kinetic energy ) is conserved and it value is 
So at point B
KE at point B is 50J
So 
Now at point D
at point D is 25J
So 
I believe its B ,<span> (the direction the north end of a </span>compass<span> needle points, corresponding to the direction of the Earth's </span>magnetic<span> field lines)</span>
Answer:
The correct answer is intensity.
Explanation:
The principle of overload is a basic sports fitness training concept which means that in order to improve, athletes must continually work harder as they their bodies adjust to existing workouts. Thus, overloading also plays a role in skill learning.
Now, since erhen wants to increase his mile run from eight to six minutes by run some sandy hills near his home, it means the principle at work is making his training runs more intense for better speed results. Thus the principle at work is intensity because he is trying to do something that makes him run faster.
