Answer:
(a) 294 J
(b) 229591.84 kg
Explanation:
height, h = 30 m
g = 9.8 m/s^2
(a) U = m x g x h
U = 1 x 9.8 x 30
U = 294 J
(b) Let the mass of water is m
U = m x g xh
80% of this energy per second is generating power
0.8 x m x 9.8 x 30 = 54 x 10^6
m = 229591.84 kg
Thus, the mass of water required is 229591.84 kg.
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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: Magnes
Explanation: Magnes found that the nails and buckle of his sandals and the tip of his staff were attracted to the rock he was standing on. He dug up the Earth to find lodestones. Lodestones contain magnetite, a natural magnetic material Fe3O4.
Answer:
Explanation:
Given that,
Force between two objects, F = 11.2 N
Distance between objects, d = 1.18 m
We need to find the charge on each objects. The force between charges is as follows :
So, the charge on each sphere is 
.
