The best answer would be a "non-directional hypothesis"
i think what is needed is for people to see that alt. energy sources are very useful and inexpensive.
Mountains, valleys, plains, piles of rocks, and craters do.
Answer: 0.016 h
Explanation:

It is given that, biker has an average speed = 18 km/h
Total distance traveled = 0.30 km
Therefore, time taken by biker to travel this distance:

Thus, the biker takes 0.016 hours to travel the segment of 0.30 km at an average speed of 18 km/h.
Answer:
The electric field is 
Explanation:
From the question we are told that
The radius of the inner sphere is 
The radius of the outer sphere is 
The charge on the inner sphere is 
The charge on the outer sphere is 
The position from the origin is 
Generally the electric field is mathematically represented as

The reason for using
for the calculation is due to the fact that the position considered is greater than the
but less than 
Here k is the Coulomb constant with value 
So

