Almost all methods of generating electricity depend on using
some other form of energy to spin an electrical generator.
If the other form of energy is kinetic energy robbed from wind,
then the wind turns the blades of a big 'fan', and the blades
spin the electrical generator.
In a commercial windmill, the electrical generator is in that 'box'
on top of the pole, right behind the hub of the blades.
a vector is inclined at 45 degree North of east
so here we can say
here we can say that
East direction is along x direction
North direction is along Y direction
so here the given direction in vector form as
so here the given direction is in vector form shown as above
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Answer: D) 30</h3>
Angle of incidence always equals angle of reflection. Think of a tennis ball being hit into a wall. The ball will bounce off at the same angle that it approached with. The angles mentioned are formed through the line called the "normal", which is the line perpendicular to the surface.
Answer:
Correct answer: E total = 2,800 J
Explanation:
Given:
m = 4 kg the mass of the object
V = 20 m/s the speed (velocity) of the object
H = 50 m the height of the object above the surface
E total = ? J
The total energy of an object is equal to the sum of potential and kinetic energy
E total = Ep + Ek
Ep = m g H we take g = 10 m/s²
Ep = 4 · 10 · 50 = 2,000 J
Ek = m V² / 2
Ek = 4 · 20² / 2 = 2 · 400 = 800 J
E total = 2,000 + 800 = 2,800 J
E total = 2,800 J
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