Answer:
work done=fdcosø
f=mg=450N
d=+3m
ø=180
450×3×cos(180°) power=work done/
time taken
1350×-1 p=135watts
As we know by Gauss's law that
so for line charge the gaussian surface is cylindrical in shape
so we will have
now by rearranging the terms
so here we will have to find the x component of electric field so it is given by above equation
here x = distance from the wire where we need to find electric field
We use the first equation of motion, to calculate the acceleration of the car
Here, v is final velocity and its value is 100 km/h = 100(1000/3600) = 27 .78 m/s and u is initial velocity as car accelerates from rest so its value zero and t is time taken and its value is given 4.80 s.
Therefore,
.
Now the magnitude of force,
.
Thus, the magnitude of force by passenger experience during the acceleration is 393 .52 \ N.
No, speed is not a vector. it is scalar.
because it doesn't need direction but need magnitude.