Answer:
1470kgm²
Explanation:
The formula for expressing the moment of inertial is expressed as;
I = 1/3mr²
m is the mass of the body
r is the radius
Since there are three rotor blades, the moment of inertia will be;
I = 3(1/3mr²)
I = mr²
Given
m = 120kg
r = 3.50m
Required
Moment of inertia
Substitute the given values and get I
I = 120(3.50)²
I = 120(12.25)
I = 1470kgm²
Hence the moment of inertial of the three rotor blades about the axis of rotation is 1470kgm²
Answer:
It will take him 3.29 s to reach his aquatic homeland
Explanation:
From the equation of motion,
S = ut + 1/2gt² .................... Equation 1
Where S = Height, u = initial velocity, g = acceleration due to gravity, t = time.
<em>Note: For a falling body, u = 0 m/s.</em>
<em>S = 1/2gt²...................... Equation 2</em>
<em>Making t the subject of the equation</em>
t = √(2S/g)...................... Equation 3
<em>Given: S = 53.0 m, </em>
<em>Constant: g= 9.8 m/s²</em>
<em>Substituting these value into equation 3</em>
<em>t = √(2×53/9.8)</em>
t = √(106/9.8)
t = √10.82
t = 3.29 s
Therefore it will take him 3.29 s to reach his aquatic homeland
Answer:
50mi / 78 mi/hr = 0.6410256... ≈ 0.64 hr
Explanation:
50mi / 78 mi/hr
Explanation:
Cons
- Nuclear energy is very unsafe compared to other energy sources. A leakage or explosion can release dangerous radioactive elements from the plant causing lethal mutations on the organisms in the ecosystems.
- Nuclear energy use produces nuclear waste that needs to be stored safely to avoid contaminating the environment. Finding a safe place to store the waste and how to contain the waste over 1000s of years is very costly and challenging.
Pros
- Nuclear energy is very clean energy because it releases no greenhouse emissions into the atmosphere that may cause global warming.
- Its is a cheap form of energy because it releases a lot of energy relative to the investment.
Learn More:
For more on nuclear energy check out;
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Answer:
hart beats in 0.8s=1
heart beat in 1s= 1/0.8
70 years=2207520000s
heart beat in 70years(2207520000s)=1.25x2207520000
=2759400000times
Explanation: