Like chargers ___ and opposite chargers _

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Answer 1

Answer: Like charges repel, while opposite charges attract.

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While skateboarding at 19 km/h, Alana throws a tennis ball at 11 km/h to her friend Oliver. If Alana is the reference frame, the speed of the tennis ball is km/h.

An automobile covered the distance of 240 km between A and B with a certain speed. On its way back, the automobile covered half of the distance at the same speed and for the rest of the trip he increased his speed by 10 km/hour. As a result, the drive back took him 2 5 of an hour less than the drive from A to B. What was the automobile’s speed when it was driving from A to B?

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Answer:

Therefore the speed of automobile when it was driving from A to B was 50 km/ h.

Explanation:

Given that,

An automobile covered the distance of 240 km between A and B with a certain speed.

Let the speed of the automobile be x km/hour.

We know that,

$Time =(distance)/(speed)$

Time taken to travel from A to B point is $=(240)/(x)$ hours.

On its back, the automobile covered half of distance= 120 km at the same speed and for the trip he increased his speed 10 km/hour.

Time taken to complete the trip is

$=((120)/(x)+(120)/(x+10))$ hours

The driver took $\frac25$ of an hour less when he come back.

According to problem,

$(240)/(x)-((120)/(x)+(120)/(x+10))=\frac25$

$\Rightarrow(240)/(x)- (120)/(x)-(120)/(x+10)=\frac25$

$\Rightarrow(240-120)/(x)-(120)/(x+10)=\frac25$

$\Rightarrow(120)/(x)-(120)/(x+10)=\frac25$

$\Rightarrow(120(x+10)-120x)/(x(x+10))=\frac25$

$\Rightarrow(120x+1200-120x)/(x^2+10x)=\frac25$

$\Rightarrow(1200)/(x^2+10x)=\frac25$

$\Rightarrow 2(x^2+10x)=1200* 5$

$\Rightarrow (x^2+10x)=(1200* 5)/(2)$

$\Rightarrow (x^2+10x)=3000$

$\Rightarrow x^2+10x-3000=0$

$\Rightarrow x^2+60x-50x-3000=0$

⇒x(x+60)-50(x+60)=0

⇒(x+60)(x-50)=0

⇒x= -60, 50

The speed could not negative.

So, x=50

Therefore the speed of automobile when it was driving from A to B was 50 km/ h.

Alisha uses wire to connect a battery, a lightbulb, and a switch, but the bulb does not light up even though the switch is in the closed position. Which might explain the problem?

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Alisha uses wire to connect a battery, a lightbulb, and a switch, but the bulb does not light up even though the switch is in the closed position. The switch is in closed position that is why her circuit would not work. It must be open so that electrons can move along the wire and enable the lightbulb to light up.

The electron configuration of nitrogen (N) is

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Answer: $1s^22s^22p^3$

Explanation:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.

The electrons are filled according to Afbau's rule in order of increasing energies and thus the electronic configuration for nitrogen with atomic number of 7 which also contains 7 electrons is:

$N:7:1s^22s^22p^3$

The electron configuration of (N) is 1s²2s²2p³

What is the temperature outside of a tree?

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About 21c because it also depends on the weather outside

The change in pitch of a train's horn as it passes while you are standing still can be explained by A. the Doppler effect.
B. ultrasonic vibrations.
C. sympathetic vibration.
D. resonance.

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The change in pitch of a train's horn as it passes while you are standing still can be explained by the Doppler effect. The correct option among all the options given in the question is option "A". When the sound source from the horn of the train comes closer, the sound seems to come closer each time a sound wave gets emitted. So it comes closer to us in a bunched form. The reverse happens when the train has just passed with each emitted sound going further and further away. The frequency of the sound seems to get lower as the train moves further away.

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if a wave has a velocity of 24 m/s and a period of 3.0 s. what is he frequency of the wave in Hz?

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The frequency doesn't depend on the wave speed.
Frequency is simply the reciprocal of the period.

Frequency= 1 / (3sec) = 1/3 per sec = 1/3 Hz.

We know that by definition Frequency is the reciprocal of period.
So
f=1/3=0.33Hz

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Like chargers _________ and opposite chargers _______

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Like chargers ___ and opposite chargers _