Answer:
It means how loud or how soft an object vibrates.
Explanation:
Infra sounds are sounds with frequencies below 20 Hz.The popular concept that infra sounds are in audible holds false
Explanation:
- Some example of Infrasounds are- some animals such as whales, elephants and giraffes which communicate with each other using infrasound over long distances.
- Various natural phenomenon such as Avalanches, volcanoes, earthquakes, ocean waves, water falls and meteors also generate infrasonic waves
- Infrasound, is sound that is lower in frequency than 20 Hz or cycles per second.
- Even the human body can generate mechanical vibrations at very low frequencies, which are known as the infrasonic waves. Such low-frequency vibrations/infrasonic waves are produced by physiological processes—such as heartbeats, respiratory movements, blood flow in vessels, and other processes.
Lion, greater advantage... stronger, bigger, more powerful overall
Answer:
B)ωf = 1.8 rad/s
Explanation:
Given that
I= 2 kg.m²
d= 30 cm ,r= 15 cm
F= 4 N
t= 6 s
The torque produce by force F about point center of disc
T= F .r
T= 4 x 0.15 = 0.6 N.m
Lets take angular acceleration of the disc is α rad/s²
T= I α
0.6 = α x 2
α= 0.3 rad/s²
We know that
ωf = ωi + α t
ω =Angular speed of the disc
Initial angular speed ωi = 0 rad/s
ωf = 0 + 0.3 x 6
ωf = 1.8 rad/s
Therefore the answer is B.
Answer:
53.36 m.
Explanation:
Initial velocity of the toolbox u = 0
acceleration due to gravity g = 9.8 m s⁻²
time t = 3.3 s
height of roof h = ?
h = ut + 1/2 g t²
= 0 + .5 x 9.8 x 3.3²
= 53.36 m.