A). Scale.
You CAN measure volume with all the following except a scale.
Answer:
The angular speed is 0.83 rad/s.
Explanation:
Given that,
Mass of disk M=49 kg
Radius = 1.7 m
Mass of child m= 29 kg
Speed = 2.6 m/s
Suppose if the disk was initially at rest , now how fast is it rotating
We need to calculate the angular speed
Using conservation of momentum
![m\omega_{i}=(mr^2+\dfrac{Mr^2}{2})\omega_{f}](https://tex.z-dn.net/?f=m%5Comega_%7Bi%7D%3D%28mr%5E2%2B%5Cdfrac%7BMr%5E2%7D%7B2%7D%29%5Comega_%7Bf%7D)
![mvR=(mr^2+\dfrac{Mr^2}{2})\omega](https://tex.z-dn.net/?f=mvR%3D%28mr%5E2%2B%5Cdfrac%7BMr%5E2%7D%7B2%7D%29%5Comega)
Put the value into the formula
![29\times2.6\times1.7=(29\times1.7^2+\dfrac{49\times1.7^2}{2})\omega_{f}](https://tex.z-dn.net/?f=29%5Ctimes2.6%5Ctimes1.7%3D%2829%5Ctimes1.7%5E2%2B%5Cdfrac%7B49%5Ctimes1.7%5E2%7D%7B2%7D%29%5Comega_%7Bf%7D)
![\omega_{f}=\dfrac{29\times2.6\times1.7}{(29\times1.7^2+\dfrac{49\times1.7^2}{2})}](https://tex.z-dn.net/?f=%5Comega_%7Bf%7D%3D%5Cdfrac%7B29%5Ctimes2.6%5Ctimes1.7%7D%7B%2829%5Ctimes1.7%5E2%2B%5Cdfrac%7B49%5Ctimes1.7%5E2%7D%7B2%7D%29%7D)
![\omega_{f}=0.83\ rad/s](https://tex.z-dn.net/?f=%5Comega_%7Bf%7D%3D0.83%5C%20rad%2Fs)
Hence, The angular speed is 0.83 rad/s.
Answer:
minimum distance will be 13.33 m
Explanation:
We have given the speed of both the car = 80 km/h
We know that 1 km =1000 m
And 1 hour = 60×60 =3600 sec
So ![80km/h=\frac{80\times 1000}{3600}=22.22m/sec](https://tex.z-dn.net/?f=80km%2Fh%3D%5Cfrac%7B80%5Ctimes%201000%7D%7B3600%7D%3D22.22m%2Fsec)
Reaction time is given as t = 0.60 sec
Minimum distance will be equal to the distance driver needed during reaction time
So minimum distance = u ×t =22.22 ×0.60=13.33 m
To find the average (aka mean) of a group of numbers, all we need to do is add them up then divide that number by how many numbers we started with
23 + 21 + 24 + 22 = 90
90 ÷ 4 = 22.5
Therefore, the average distance the book traveled on ice is 22.5 cm
15 + 18 + 16 + 17 = 66
66 ÷ 4 = 16.5
Therefore, the average distance the book traveled on concrete is 16.5 cm
In conclusion, the average distance the book traveled on ice is greater than the average distance the book traveled on concrete
Hope this helps you
-AaronWiseIsBae
The angular acceleration is equal to the final angular velocity divided by the time and the average angular velocity is equal to half the final angular velocity. It follows that the rotational kinetic energy given to the flywheel is equal to the work done by the torque.