The answer is (A) hope it helps
Answer:
D
Explanation:
If you list and compare, the elephants hearing range is the closest to a humans.
Humans: 20-20,000
Elephant: 16-12,000
While the others are either too much more or less than a humans.
Bat: 2,000-110,000
Dolphin: 90-105,000
Chicken: 125-2,000
Refer to the diagram shown below.
Let I = the moment of inertia of the wheel.
α = 0.81 rad/s², the angular acceleration
r = 0.33 m, the radius of the weel
F = 260 N, the applied tangential force
The applied torque is
T = F*r
= (260 N)*(0.33 m)
= 85.8 N-m
By definition,
T = I*α
Therefore,
I = T/α
= (85.8 N-m)/(0.81 rad/s²)
= 105.93 kg-m²
Answer: 105.93 kg-m²
Answer:
Radial acceleration of moon is ![a_{r} = 2.246\times 10^{-3}](https://tex.z-dn.net/?f=a_%7Br%7D%20%3D%202.246%5Ctimes%2010%5E%7B-3%7D)
Explanation:
Given :
Time period
sec
Distance from center of moon to planet
m
From the equation of radial acceleration,
![a_{r} = r\omega ^{2}](https://tex.z-dn.net/?f=a_%7Br%7D%20%3D%20r%5Comega%20%5E%7B2%7D)
Where ![\omega = 2\pi f = \frac{2\pi }{T}](https://tex.z-dn.net/?f=%5Comega%20%3D%202%5Cpi%20f%20%3D%20%5Cfrac%7B2%5Cpi%20%7D%7BT%7D)
So
Now moon's radial acceleration,
![a_{r} = 225 \times 10^{6} \times (3.16 \times 10^{-6} )^{2}](https://tex.z-dn.net/?f=a_%7Br%7D%20%3D%20225%20%5Ctimes%2010%5E%7B6%7D%20%5Ctimes%20%283.16%20%5Ctimes%2010%5E%7B-6%7D%20%29%5E%7B2%7D)
![a_{r} = 2246.76 \times 10^{-6}](https://tex.z-dn.net/?f=a_%7Br%7D%20%3D%202246.76%20%5Ctimes%2010%5E%7B-6%7D)
![\frac{m}{s^{2} }](https://tex.z-dn.net/?f=%5Cfrac%7Bm%7D%7Bs%5E%7B2%7D%20%7D)
The material of density 7.8 g/cm³