Answer:
7.90 N/C
Explanation:
<u>Given:</u>
- = initial velocity of the electron =
- = final velocity of the electron = 0 m/s
- = distance traveled by the electron before coming to rest = 9 cm = 0.09 m
<u>Assume:</u>
- = charge on an electron =
- = mass of an electron =
- = electric field along the direction of motion
- = electric force on the electron
- = work done by the electric force
Since the electron is moving in the direction of the electric field, then the electric force on it will act in the direction opposite to its displacement whose magnitude is given by:
Since the displacement of the electron opposite to the direction of electron, the work done by electric force will be given by:
Since the electron enters the region of the uniform electric field with an initial speed u and travels a distance x to come to rest. The change in kinetic energy of the electron can be given by:
Since only the electric force is doing work on the electron, then the change in kinetic energy will be equal to the work done by electric force. This is due to the work-energy theorem.
Hence, the magnitude of electric field is given 7.90 N/C which point in the direction of the displacement of the electron.
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C play all the songs on shuffle. entropy has to do with randomness
<h2>
Option A is the correct answer.</h2>
Explanation:
Here velocity of ball and bat are in opposite direction.
Velocity of ball = 40 m/s
Velocity of bat = 18 m/s
Since they are in opposite direction relative velocity is given by,
Relative velocity = 40 + 18 = 58 m/s
Distance to home plate = 18 m
We have
Displacement = Velocity x Time
18 = 58 x Time
Time = 0.3 seconds
Option A is the correct answer.
Explanation:
Assume that mass of Earth is M, radius of earth orbit is R, and rotational period of Earth is T.
The angular momentum of Earth is,
The mass of mars is, mass of Earth
=0.11 M
The radius of mars orbit is, of radius of earth
=0.53 R
The rotational period of mars is, of period of Earth
=1.03 T
The angular momentum of mars is,
The angular momentum of mars is,
The ratio of angular momentum of mars to that of earth is,