PHYSICS MIDDLE SCHOOL

If there is a resistance off 45 ohms and a current of 120amps , what is the voltage ?

Answers

Answer 1

Answer:

Hello!

The answer is: The voltage is 5400 Volts.

Why?

We can calculate the voltage using the Ohm's Law.

The Ohm'ws Law states that:

$V=I*R$

Where,

V, is the voltage in volts

I, is the current in amps

R, is the resistance in ohms

We are given:

$R=45ohms\nI=120Amps$

Now, calculating the voltage, we have:

$V=I*R=45ohms*120Amps=5400Volts$

Hence, the voltage is 5400 Volts.

We can also calculate the power using the following formula:

$P=V*I$

Where,

P, is the power in watts

V, is the voltage in volts

I, is the current in amps

So,

$P=5400Volts*120Amps=648000W$

Have a nice day!

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6) Suppose a student throws a pencil at the wall, and upon hitting the wall, the pencilbreaks in half. What happens to the original momentum of the pencil?

Answers

The originalmomentum of a pencil is distributed equally to the other half of

the pencil.

The pencil breaking into two is as a result of the internalforces acting in

opposite direction which caused the breakage.

The total momentum of a body before collision being equal to the total

momentum of the two objects after collision has occurred which is why the

pencil will have momentum distributed equally in this scenario.

Read more on brainly.com/question/20182620

Answer:

ORIGINAL MOMENTUM OF THE PENCIL GETS DISTRIBUTED TO THE BROKEN HALFS EQUALLY .

Explanation:

GENERALLY :

For a collision occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision. That is, the momentum lost by object 1 is equal to the momentum gained by object 2.

The above statement tells us that the total momentum of a collection of objects (a system) is conserved - that is, the total amount of momentum is a constant or unchanging value.

Since the forces between the two objects are equal in magnitude and opposite in direction, and since the times for which these forces act are equal in magnitude, it follows that the impulses experienced by the two objects are also equal in magnitude and opposite in direction.

IN THIS CASE :

(neglecting the impulse and force of gravity)

The net external force on the system is ZERO
The collision and the breakage that happens is PURELY due to the internal force which are equal and opposite.
When we consider the wall and the pencil together as a system , the net external force on the system is zero.
We also assume that the wall is very heavy and thus it remains at rest even after the collision.
Thus , according to the law of conservation of momentum, the pencil must have the same momentum imparted to it initially.
Therefore , the ORIGINAL MOMENTUM OF THE PENCIL GETS DISTRIBUTED TO THE BROKEN HALFS EQUALLY .

Which of the following statements best explains why it is warmer at the equator than at the north pole?A. The equator has a larger area than the North Pole
B. The equator is closer to the sun than the North pole
C. The equator receives more direct sunlight than the north pole.
D. The equator has more hours of daylight per year than the North Pole.

Answers

Answer:

C. The equator receives more direct sunlight than the north pole.

Explanation:

As we all know that earth is revolving around the sun. But the earth is also tilted at the angle of 23.5°, which means that the equator part of earth is facing sun directly while the north pole is tilted. As a result of this tilt, the north pole receives the rays of sun at certain angle which reduces the intensity and effect of sunlight. While the equator part, since it is facing the sun, receives sunlight at almost perpendicular. So, the absorption of heat by the earth's atmosphere and land is pretty much higher in equator as compared to north pole.

The sun is pointing more towards the equator than any other part of the Earth, so it would be C.

A lens of focal length 15.0 cm is held 10.0 cm from a page (the object ). Find the magnification .

Answers

Answer:

Magnification, m = 3

Explanation:

It is given that,

Focal length of the lens, f = 15 cm

Object distance, u = -10 cm

Lens formula :

$(1)/(v)-(1)/(u)=(1)/(f)$

v is image distance

$(1)/(v)=(1)/(f)+(1)/(u)\n\n(1)/(v)=(1)/(15)+(1)/((-10))\n\nv=-30\ cm$

Magnification,

$m=(v)/(u)\n\nm=(-30)/(10)\n\nm=3$

So, the magnification of the lens is 3.

Answer:

3.00 - Magnification.

Now this is REALLY helpful ( I hope)

Image distance :

-30.0

It is CORRECT FOR ACELLUS!

I wish you luck!

Two waves with amplitudes of 52 units and 98 units come together. Their amplitude, which is measured at a specific point and time, is 46 units. What wave behavior explains this value? A. destructive interference B. constructive interference C. refraction D. diffraction E. partial transmission

Answers

Answer: A

destructive interference

Explanation: Interference involves coming together of two waves of the same type. E.g sound waves, water waves e.t.c

Whenever two waves of different amplitude interferes with one another and there is increase in amplitude, this is known as constructive interference.

But whenever there is decrease in amplitude as a result of interference of the two waves, this is known as destructive interference.

If Two waves with amplitudes of 52 units and 98 units come together. Their amplitude, which is measured at a specific point and time, is 46 units. The wave behavior that explains this value is destructive interference because of decrease in the units of amplitude.

Answer:

destructive interference

Explanation: Plato user

What do tendons connect skeletal muscles to?

Answers

Answer:

Tendons connect muscle to bone. These tough, yet flexible, bands of fibrous tissue attach the skeletal muscles to the bones they move. Essentially, tendons enable you to move; think of them as intermediaries between muscles and bones.

Hope this helps! (:

Answer:

Explanation:Tendons connect muscle to bone. These tough, yet flexible, bands of fibrous tissue attach the skeletal muscles to the bones they move. Essentially, tendons enable you to move; think of them as intermediaries between muscles and bones.

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