The speed of the wave is 1000 m/s.
Answer:
Explanation:
Speed of a wave will always be equal to the product of wavelength and frequency of the wave.
Since, here the wavelength is given as 10 m and frequency is given as 100 Hz, the multiplication of these two terms will specify the speed of that wave.
Speed = Wavelength × Distance
Speed = 100 × 10 = 1000 m/s.
So, the speed of the wave is 1000 m/s.
Answer:
q = 8.85 x 10⁻¹¹ C
Explanation:
given,
Electric field, E = 1.18 N/C
distance, r = 0.822 m
Charge magnitude = ?
using formula of electric field.
k is the coulomb constant
q = 8.85 x 10⁻¹¹ C
The magnitude of charge is equal to q = 8.85 x 10⁻¹¹ C
Answer:
72.75 kg m^2
Explanation:
initial angular velocity, ω = 35 rpm
final angular velocity, ω' = 19 rpm
mass of child, m = 15.5 kg
distance from the centre, d = 1.55 m
Let the moment of inertia of the merry go round is I.
Use the concept of conservation of angular momentum
I ω = I' ω'
where I' be the moment of inertia of merry go round and child
I x 35 = ( I + md^2) ω'
I x 35 = ( I + 25.5 x 1.55 x 1.55) x 19
35 I = 19 I + 1164
16 I = 1164
I = 72.75 kg m^2
Thus, the moment of inertia of the merry go round is 72.75 kg m^2.
