Answer:
hmm
Explanation:
By increasing the number of turns in the coil, strength of magnetic field, speed of rotation of the coil in the magnetic field and by decreasing the distance between the coil and the magnet the magnitude of the induced e.m.f. can be increased in generator/dynamo.
Answer:
Explanation:
All the rest of the information is extraneous. The only 2 things you have to know are
d = 20 km
t = 8 minutes = 8/60 hours = 0.13333333
So the speed is s = d/t
s = 20/0.1333333 = 150 km/hour
Note: you have not specified what units the speed is. I suppose you could answer 20/8 = 2.5 km/min
Answer:
V=Bh
Explanation:
B h is used for rectangular solids and cylinders
Answer:
Before start of slide velocity will be 14.81 m/sec
Explanation:
We have given coefficient of static friction ![\mu =0.8](https://tex.z-dn.net/?f=%5Cmu%20%3D0.8)
Angle of inclination is equal to ![\Theta =tan^{-1}\mu](https://tex.z-dn.net/?f=%5CTheta%20%3Dtan%5E%7B-1%7D%5Cmu)
![\Theta =tan^{-1}0.8=38.65^{\circ}](https://tex.z-dn.net/?f=%5CTheta%20%3Dtan%5E%7B-1%7D0.8%3D38.65%5E%7B%5Ccirc%7D)
![tan{38.65^{\circ}}=0.8](https://tex.z-dn.net/?f=tan%7B38.65%5E%7B%5Ccirc%7D%7D%3D0.8)
Radius is given r = 28 m
Acceleration due to gravity ![g=9.8m/sec^2](https://tex.z-dn.net/?f=g%3D9.8m%2Fsec%5E2)
We know that ![tan\Theta =\frac{v^2}{rg}](https://tex.z-dn.net/?f=tan%5CTheta%20%3D%5Cfrac%7Bv%5E2%7D%7Brg%7D)
![0.8=\frac{v^2}{28\times 9.8}](https://tex.z-dn.net/?f=0.8%3D%5Cfrac%7Bv%5E2%7D%7B28%5Ctimes%209.8%7D)
![v^2=219.52](https://tex.z-dn.net/?f=v%5E2%3D219.52)
![v=14.816m/sec](https://tex.z-dn.net/?f=v%3D14.816m%2Fsec)
So before start of slide velocity will be 14.81 m/sec