Answer: The correct option is Option b.
Explanation:
Power is defined as the rate of work done by an object.
Mathematically,
.....(1)
And work done is the product of force exerted on the object times the displacement covered by that object.
Mathematically,

Putting this value in above equation, we get:

where,
P = power = ?W
F = Force exerted = 10N
s = Displacement = 400cm = 4m (Conversion factor: 1m = 100 cm)
t = Time taken = 8s
Putting values in above equation, we get

Hence, the correct option is Option b.
Answer:
demand (an amount) as a price from someone for a service rendered or goods supplied.
Answer:
In most materials, atoms are arranged in such a way that the magnetic orientation of one electron cancels out the orientation of another
Answer:
Explanation:
Given
Initial Moment of Inertia 
initial Spin 

Final Moment Moment of Inertia 
Conserving Angular momentum





The mass of the astronaut is still 65 kilograms. Mass is constant or doesn't change no matter where you are.