In which situation is no work being done? A. a person carrying a box from one place to another B. a person picking up a box from
2 answers:
Answer:
A person carrying a box from one place to another.
Explanation:
The work done is defined as the product of force, displacement and the angle between the force and displacement. Mathematically, it can be written as :
Where
is the angle between the force and the displacement
When , then W = 0 (since, cos 90 = 0)
The situation in which no work being done is (a) " a person carrying a box from one place to another". In this case, the force acting on the person is gravitational force only which acts in downward direction and the person is carrying box from one place to another. So, the angle between the force and displacement is 90 degrees. Hence, no work being done.
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Answer:
Explanation:
frequency n = 90 x 10⁶ Hz .
time period T = 1 / n
= 1 / 90 x 10⁶
= 1.11 x 10⁻⁸ S.
wavelength = velocity of light / frequency
= 3 x 10⁸ / 90 x 10⁶
= 3.33 m
maximum value of the magnetic field. ( B₀ )
E₀ / B₀ = c where E₀ and B₀ are maximum electric and magnetic field .
E₀ / c= B₀
200/ 3 x 10⁸
= 66.67 x 10⁻⁸ T .
expressions in SI units for the space and time variations of the electric field
N/C
T