The answer to this is 59,290 N
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Answer:
Explanation:
As per Doppler's effect of sound the frequency of the sound when source is approaching the observer is given as
similarly when source is moving away from the observer then its frequency is given as
now we know that the ratio of two frequency is
Answer:
By a magnetic field: no
By an electric field: yes
Explanation:
The force exerted by a magnetic field on an electron is
where
q is the electron charge
v is the speed of the electron
B is the strength of the magnetic field
is the angle between the direction of v and B
As we see from the formula, if the electron is at rest, then v = 0, and therefore the force is also zero: F = 0. Therefore, the magnetic field cannot set the electron into motion.
On the other hand, the force exerted on an electron by an electric field does not depend on the speed:
where E is the intensity of the electric field
Therefore, the electric force acts also when the electron is at rest, so it is able to set the electron into motion.
<u>Answer:</u>
The correct answer option is: 2 km South.
<u>Explanation:</u>
We are to find out the displacement for the given vectors:
- 4 km south,
- 2 km north,
- 5 km south; and
- 5 km north
So starting off with the vector going 4 km south we have a displacement of 4 km south. Then it goes 2 km so we are left with 4 - 2 = 2 km south.
Next, it goes 5 km south so we will have a displacement of 2 + 5 = 7 km south. Then again it goes 5 km north so we are left with a displacement of 7 - 5 = 2 km South.