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12345 [234]
2 years ago
11

DC current is flowing in the primary coil of a transformer. Which of the following DOES NOT happen? A. There is a magnetic field

in the primary
B.Current flows in the primary
C.The primary gets warm
D.Current flows in the secondary
Physics
2 answers:
Olegator [25]2 years ago
8 0

DC current is flowing in the primary coil of a transformer.

<em>Choice-D</em> is the one that does NOT happen.

A. There is a magnetic field in the primary.

Yes, just as there is around EVERY current-carrying conductor.

B. Current flows in the primary.

Yes.  The first sentence says so.

C. The primary gets warm.

Yes. Just like ANY current-carrying conductor that has any resistance.

<em>D. </em> Current flows in the secondary

<em>NO.</em>  Current in the secondary is the result of CHANGES in the primary current. Since the primary current is DC, there aren't any changes.

A long time ago, in engineering school in a galaxy far away, I learned that when you put DC into a transformer, what comes out is smoke.

GrogVix [38]2 years ago
7 0

Answer:

d

Explanation:

and just because trust me on this one my guy

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Juliana walks 45 meters East, 45 meters south and 45 meters north. What is her resultant displacement?
katrin2010 [14]

Her resultant displacement is (45 Meters East.)

She originally walks 45 meters east, then she goes south 45 meters, then north 45 meters.  The south and north placements  just make her go back to where her previous placements were before them. Making her 45 meters east.

6 0
3 years ago
A 75 kg football player is gliding forward across very smooth ice at 4.6 m/s. He throws a 0.47 kg football straight forward. A)
lord [1]

Answer:

4.53482 m/s

4.506 m/s

Explanation:

m_1 = Mass of player = 75 kg

v_1 = Initial velocity of player = 4.6 m/s

m_2 = Mass of ball = 0.47 kg

v_1 = Initial velocity of ball = 15 m/s

The linear momentum of the system is conserved

(m_1+m_2)v_1=m_1v+m_2v_2\\\Rightarrow v=\dfrac{(m_1+m_2)v_1-m_2v_2}{m_1}\\\Rightarrow v=\dfrac{(75+0.47)4.6-0.47\times 15}{75}\\\Rightarrow v=4.53482\ m/s

The player's speed is 4.53482 m/s

In the second case the equation of momentum is

(m_1+m_2)v_1=m_1v+m_2(v_2+v_1)\\\Rightarrow v=\dfrac{(m_1+m_2)v_1-m_2(v_2+v_1)}{m_1}\\\Rightarrow v=\dfrac{(75+0.47)4.6-0.47\times (15+4.6)}{75}\\\Rightarrow v=4.506\ m/s

The player's speed is 4.506 m/s

4 0
3 years ago
Which is a possible measurement of the momentum of a moving object?
Delvig [45]

Momentum is a vector, although we don't hammer on that.  In order to completely describe a momentum, you need a magnitude AND a direction ... just like force and velocity.

So choice #2 is the magnitude of a momentum, without its direction.

<em>Choice #3</em> is  the full package, with both the magnitude and the direction.

Choice #1 has units of energy, and choice #4 has units of acceleration, so neither of those can be it.

8 0
3 years ago
Read 2 more answers
The Kelvin scale begins at zero and goes up, 0 Kelvin is also known as _________.
likoan [24]
0 Kelvin is also known as Absolute Zero.

It is also the temperature of nil thermal motion. 
8 0
3 years ago
A small plastic bead has been charged to -14 nC .
Studentka2010 [4]

Answer:

The magnitude of the acceleration of a proton at a distance of 1.5cm from the bead is 5.6 x10^13m/s².

The magnitude of the acceleration of a proton at a distance of 1.5cm from the bead is 9.8 x10^16m/s².

Explanation:

Newton's second law states that the total sum of the force acting on a particle in motion is equal to the mass of the particle times the acceleration due to the force. So the electric force between the bead and proton is equal to ma. That is,

Fe = kq1*q2/r² = m*a

The proton had a charge of +1.6x10^-19C and a mass of 1.67×10^-27kg

By substituting these values into the equivalent for a we have that the acceleration of the proton at a distance of 1.5cm form the bead is 5.6×10^13m/s²

The proton had a charge of -1.6x10^-19C and a mass of 9.10×10^-31kg

By substituting these values into the equivalent for a we have that the acceleration of the proton at a distance of 1.5cm form the bead is 9.8×10^16m/s²

3 0
3 years ago
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