Answer: C
Explanation:
Find the acceleration using this kinematic equation:
![v_f=v_i+at\\66=0+a*8\\a=8.25m/s^2](https://tex.z-dn.net/?f=v_f%3Dv_i%2Bat%5C%5C66%3D0%2Ba%2A8%5C%5Ca%3D8.25m%2Fs%5E2)
Now use this kinematic equation to find the displacement:
![v_f^2=v_i^2+2a*d\\66^2=0^2+2(8.25)d\\4356=16.5d\\d=264m](https://tex.z-dn.net/?f=v_f%5E2%3Dv_i%5E2%2B2a%2Ad%5C%5C66%5E2%3D0%5E2%2B2%288.25%29d%5C%5C4356%3D16.5d%5C%5Cd%3D264m)
Answer:
Explanation:
Energy of a wave is proportional to ( amplitude )²
it is also proportional to ( frequency )²
It is proportional to velocity
Here velocity is constant
energy of wave ∝ ( amplitude )² x ( frequency )²
So, option C a high amplitude and a high frequency is correct .
It is d or c i say c because its mixed with chemicals and d bc the temperture drop to get it cold
Answer:
N₂ = 503.8 N
Explanation:
given,
mass of bottom block = 37 Kg
mass of middle block = 18 Kg
mass of the top block = 16 Kg
force acting on the top block = 170 N
force on the block at top
N₁ be the normal force from block at middle
now,
N₁ = 170 + m g
N₁ = 170 + 16 x 9.8
now, force on block at middle
N₂ be the normal force exerted by the bottom block
N₂ = N₁ + m₂ g
N₂ = 326.8 + 18 x 9.8
N₂ = 503.8 N
hence, normal force by bottom block is equal to N₂ = 503.8 N
Answer:
We first to know that if the wheel rotates from rest means that at t=0 the velocity and the angle rotated is 0.
Then, we know:
![\alpha = 1.33 = \frac{dw}{dt}](https://tex.z-dn.net/?f=%5Calpha%20%3D%201.33%20%3D%20%5Cfrac%7Bdw%7D%7Bdt%7D)
Integrating 2 times, we have:
![w = 1.33t\\angle =0.665t^{2}](https://tex.z-dn.net/?f=w%20%3D%201.33t%5C%5Cangle%20%3D0.665t%5E%7B2%7D)
For the first 27.9 s, we have:
w = 37.107 rad/s
angle = 517.6426 rad
For the next seconds, according to the text, the angular velocity is constant so
w = 37.107 rad/s and hence, integrating:
![angle =37.107t](https://tex.z-dn.net/?f=angle%20%3D37.107t)
Then, the time remaining is:
53.5 - 27.9 = 25.6
So for the next 25.6 seconds we have:
![angle = 37.107*25.6=949.9392 rad](https://tex.z-dn.net/?f=angle%20%3D%2037.107%2A25.6%3D949.9392%20rad)
Finally, we add the 2 angles and we have as a result:
![angle = 517.6426+949.9392=1467.5818](https://tex.z-dn.net/?f=angle%20%3D%20517.6426%2B949.9392%3D1467.5818)