Friction is helpful:
- We use it to brake for cars
- We use it to fly planes
-We wouldn't be able to turn a door knob without friction ( Our hand would just slide off it)
Friction harmful:
-Our cars would get much better gas mileage without tire and air friction
- There would be no skinned knees if friction didn't exist (Like when your skating or football)
- We could do some pretty cool dance moves without friction
- Our shoes would last longer without friction
Answer:
i would say the last one Heat energy from below the ground converts water to steam to drive a steam turbine attached to an electrical generator
Explanation:
Answer:
Specific rotation of cholesterol is -3.15°.
Explanation:
Given that
Path length = 10 cm = 1 dm.
Observed rotation ,α= - 0.441 °
m= 0.14 g
V= 1 ml
The concentration of cholesterol ,c= m/V g/ml
c = 0.14 / 1 = 0.14 g/ml
We know that specific rotation given as
![[\alpha]_D=\dfrac{\alpha}{l.c}](https://tex.z-dn.net/?f=%5B%5Calpha%5D_D%3D%5Cdfrac%7B%5Calpha%7D%7Bl.c%7D)
Now by putting the all values
![[\alpha]_D=\dfrac{\alpha}{l.c}](https://tex.z-dn.net/?f=%5B%5Calpha%5D_D%3D%5Cdfrac%7B%5Calpha%7D%7Bl.c%7D)
![[\alpha]_D=\dfrac{-0.441}{1\times 0.14}](https://tex.z-dn.net/?f=%5B%5Calpha%5D_D%3D%5Cdfrac%7B-0.441%7D%7B1%5Ctimes%200.14%7D)
°
Specific rotation of cholesterol is -3.15°.