Answer:
speed of boat as
river speed is given as
Explanation:
When boat is moving down stream then in that case net resultant speed of the boat is given as
since the boat and river is in same direction so we will have
Now when boat moves upstream then in that case the net speed of the boat is opposite to the speed of the river
so here we have
as we know when boat is in downstream then in that case it covers 24 miles in 2 hours
also when it moves in upstream then it covers same distance in 3 hours of time
so we have speed of boat as
river speed is given as
Answer:
The distance of separation is 
Explanation:
The mass of the each ball is 
The negative charge on each ball is 
Now we are told that the lower ball is restrained from moving this implies that the net force acting on it is zero
Hence the gravitational force acting on the lower ball is equivalent to the electrostatic force i.e
=> 
here k the the coulomb's constant with a value 
So
![0.01 * 9.8 = \frac{ 9*10^9 *[1*10^{-6} * 1*10^{-6}]}{d}](https://tex.z-dn.net/?f=0.01%20%2A%209.8%20%20%3D%20%20%5Cfrac%7B%209%2A10%5E9%20%2A%5B1%2A10%5E%7B-6%7D%20%2A%201%2A10%5E%7B-6%7D%5D%7D%7Bd%7D)
Answer:
Explanation:
We are given that
Frequency,f=800KHz=
Distance,d=4.5 km=
1 km=1000 m
Electric field,E=0.63V/m
We have to find the magnetic field amplitude of the signal at that point.
We know that
Potential Energy = mgh ,
mass = 1.4 kg, g ≈ 10 m/s², h = 0.8m
Potential Energy = mgh = 1.4 * 10 * 0.8 = 11.2 N
Potential Energy added = 11.2 N
