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inessss [21]
2 years ago
11

A charge Q experiences no net force at a particular point in space. Which of the following situations described below must ALWAY

S be true?
-There are no other charges nearby.

-If there are other charges nearby, they must all have the same sign as Q.

-If there are other charges nearby, they must all have the opposite sign of Q.

-If there are other charges nearby, the total positive charge must equal the total negative charge.

-None of the Above
Physics
1 answer:
laila [671]2 years ago
8 0

Answer:

-There are no other charges nearby.

Explanation:

-There are no other charges nearby.

If there is no net charge in nearby space then the force on this charge will be ZERO

-If there are other charges nearby, they must all have the same sign as Q.

There there is nearby charge of same sign then it will have repulsion force on Q

-If there are other charges nearby, they must all have the opposite sign of Q.

if there is nearby charge of opposite sign then the force must be attraction force.

-If there are other charges nearby, the total positive charge must equal the total negative charge.

If there exist two type of charges nearby then there may exist either attraction or repulsion force on it

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In the context of energy transfers with hot and cold reservoirs, the sign convention is that _______________.
Likurg_2 [28]

Answer:

B. QC > 0; QH < 0

Explanation:

Given that there are two reservoir of energy.

Sign convention for heat and work :

1.If the heat is adding to the system then it is taken as positive and if heat is going out from the system then it is taken as negative.

2. If the work is done on the system then it is taken as negative and if the work is done by the system then it is taken as positive.

From hot reservoir heat is going out that is why it is taken as negative

Q_H

From cold reservoir heat is coming inside the reservoir that is why it is taken as positive

Q_C>0

That is why the answer will be

Q_H ,Q_C>0

8 0
1 year ago
An all female guitar septet is getting ready to go on stage. The lead guitarist, Kira,who is always in tune, plucks her low E st
matrenka [14]

Answer:

Buffy > Aiko > Chandra > Freja > Evita

Explanation:

Beats occur when two waves of nearby frequencies overlap. The number of beats per second is equal to the difference in the frequency.

Let

f= Frequency of Kira

f_1= Frequency of Aiko

The beat frequency of Kira and Aiko is therefore,

f_{beat}=|f_2-f_1|

Substituting  f  for  f_2  and 3Hz for f_{beat} , we get

3Hz=|f-f_1|\\f_1=f+3Hz

From the above equation, we see that beats increase

when

f_2 = Frequency of Chandra

The beat frequency of Kira and Chandra is therefore,

1Hz=|f-f_2|\\f_2=f-1Hz

From the above equation, we see that beats decrease

When

f_3= Frequency of Evita

The beat frequency of Kira and Evita is therefore,

5Hz=|f-f_3|\\f_3=f-5Hz

From the above equation, we see that beats decrease

When

f_4= Frequency of Freja

The beat frequency of Kira and Freja is therefore,

3Hz=|f-f_4|\\f_4=f-3Hz

From the equation above, we see that beats decrease

When

f_5= Frequency of Buffy

The beat frequency of Kira and Buffy becomes,

4Hz=|f-f_5|\\f_5=f+4Hz

From the equation above, we see that beats increase

Hence, the rank of members based on initial frequencies from largest to smallest is Buffy > Aiko > Chandra > Freja > Evita

6 0
1 year ago
If current I=2A and resistance R= 5 ohms what is the potential difference (voltage) V?
damaskus [11]

Answer:

10 V

Explanation:

From Ohm's law, V=IR where V is the potential difference voltage, I is the current and R is resistance. Substituting 2A for current and 5 Ohms for resistance then V=2*5= 10 V

6 0
2 years ago
Describe how private citizens have a voice in which projects the federal government will fund
erastovalidia [21]
<span>Two main ways, free elections, casting your vote for the candidate supporting your goals. Second, Lobbying the sitting gov.</span>
3 0
1 year ago
A magic medallion is suspended from a string inside a compartment of Hogwarts Express which is running straight westwards on hor
Serggg [28]

Answer:

a = 1 m/s²  and

Explanation:

The first two parts can be seen in attachment

We use Newton's second law on each axis

Y axis

      Ty - W = 0        

      Ty = w

X axis

     Tx = m a

With trigonometry we find the components of tension

    Sin θ = Ty / T

    Ty = T sin θ

    Cos θ = Tx / T

    Tx = T cos θ

We calculate the acceleration with kinematics

   Vf = Vo + a t

   a = (Vf -Vo) / t

   a = (20 -10) / 10

   a = 1 m/s²

We substitute in Newton's equations

     

  T Sin θ = mg

  T cos θ = ma

We divide the two equations

  Tan θ = g / a

  θ = tan⁻¹ (g / a)

  θ = tan⁻¹ (9.8 / 1)

  θ = 84º

We see that in the expression of the angle the mass does not appear therefore you should not change the angle

4 0
1 year ago
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