Answer:
2.933 kg m/s
Explanation:
impulse = change in momentum
impulse = mass ( final velocity - initial velocity )
= 0.0459 ( 63.9 - 0 )
= 0.0459 × 63.9
= 2.93301 kg m/s
or = 2.933 kg m/s up to 4 significant figures
Answer:
50 dB.
Explanation:
given,
Amplification needed by the woman,I= 1 x 10⁵ I₀
where as I₀ is the threshold frequency
overall hearing loss of the woman= ?
Using the equation of sound intensity level
The overall hearing loss of woman is equal to 50 dB.
Answer:
- 14.5 rad/s^2
Explanation:
n = 19
θ = 2 x 3.14 x 19 = 119.32 rad
t = 3 s, ω = 18 rad /s , ω0 = ?,
Let α be the angular acceleration.
Use First equation of motion for rotational motion
ω = ω0 + α t
18 = ω0 + α x 3
ω0 = 18 - 3α .....(1)
Use second equation of motion for rotational motion
θ = ω0 t + 1/2 x α x t^2
Put the value of ω0 = 18 - 3α from equation (1)
119.32 = (18 - 3α) x 3 + 1/2 x α x 9
119.32 - 54 = - 4.5 α
α = - 14.5 rad/s^2