Velocity of swimmer in still water = Velocity along width of river = 1.20 m/s
So, time taken by the swimmer to cross the river = 150/1.20 = 125 seconds
So , the swimmer is going downstream for 125 seconds at a speed of 0.55 m/s
Distance traveled during that time = 0.55*125 = 68.75 m
So the swimmer will reach 68.75 m far from the point opposite to her starting point
Answer:
the emf generated by a magnetic coil of the generator, because it consists of a coil turning in a magnetic field; it opposes the voltage powering the motor, so at first the current reaches 10A but subsequently due to the back emf generated in the coil this emf opposes the self induced emf thereby reducing the current to 4A
Explanation:
Answer:
3.67 rad/s
Explanation:
L = Length of meter stick = 1 m
r = Distance at which the bullet will hit the stick =
m = Mass of bullet = 3 g
M = Mass of stick = 270 g
= Velocity of bullet = 250 m/s
= Velocity of bullet leaving = 140 m/s
Initial angular momentum
Final angular momentum of the system
Since, angular momentum is conserved we have
The angular speed is the stick spinning after the collision is 3.67 rad/s
Answer:
Part A:
Part B:
Explanation:
<u>Given:</u>
- = initial velocity of the electron =
- = electric field strength = 9100 N/C
<u>Assumptions:</u>
- = mass of the electron =
- = final velocity of the electron = 0 m/s
- = distance at which the electron comes to rest
- = magnitude of charge on an electron =
- = taken by the electron to return to its initial position
- = displacement of the electron
Part A:
Since the electron moves in the direction of the electric field, the electric force will act on it in the direction opposite to electric field. This electric force does work on it to make the electron come to rest.
Using the work-energy theorem, the work done by the electric field will be equal to the kinetic energy change of the electron.
Hence, the electron comes to rest by travelling a distance of .
Part B:
In this part, let us first find out the acceleration of the electron due to the electric force.
The electron moves with the above acceleration constantly as it moves in the uniform electric field.
Since the electron is supposed to move from a point and then again move back to the same point. This means the displacement of the electron is zero.
Since the electron starts moving at t = 0 s.
Hence, the electron returns to the starting position after .