PHYSICS HIGH SCHOOL

Which Of The Following Statements Are True?A) The north pole of a bar magnet will attract the south pole of another bar magnet.
B) Earth's geographic north pole is actually a magnetic south pole.
C) Earth's geographic south pole is also a magnetic south pole.
D) The north poles of two bar magnets will attract each other. Scientists have evidence that single isolated magnetic poles, called magnetic monopoles, exist.
E) The south poles of two bar magnets will repel each other.

Answers

Answer 1

Answer:

Answer:

A) The north pole of a bar magnet will attract the south pole of another bar magnet.

B) Earth's geographic north pole is actually a magnetic south pole.

E) The south poles of two bar magnets will repel each other.

Explanation:

According to classical physics, a magnetic field always has two associated magnetic poles (north and south), the same happens with magnets. This means that if we break a magnet in half, we will have two magnets, where each new magnet will have a new south pole, and a new north pole.

This is because for classical physics, naturally, magnetic monopoles can not exist.

In this context, Earth is similar to a magnetic bar with a north pole and a south pole. This means, the axis that crosses the Earth from pole to pole is like a big magnet.

Now, by convention, on all magnets the north pole is where the magnetic lines of force leave the magnet and the south pole is where the magnetic lines of force enter the magnet.

Then, for the case of the Earth, the north pole of the magnet is located towards the geographic south pole and the south pole of the magnet is near the geographic north pole.

And it is for this reason, moreover, that the magnetic field lines enter the Earth through its magnetic south pole (which is the geographic north pole).

Answer 2

Answer:

Answer:ITS what that man said

Explanation:

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What is the equation for the energy of a photon? a) E = mc^2 b) E = hf c) E = 1/2 mv^2 d) E = GmM/r

Answers

Answer:

$E = h\, f$ , where $h$ is Planck's Constant and $f$ is the frequency of this photon.

Explanation:

The energy $E$ of a photon is proportional to its frequency. This relationship is known as Planck's Relation:

$E = h\, f$ ,

Where:

$h \approx 6.626 * 10^(-34)\; {\rm J \cdot s}$ is Planck's Constant, and
$f$ is the frequency of this photon.

Football player A has a mass of 210 pounds and is running at a rate of 5.0 mi/hr. He collides with player B. Player B has a mass of 190 pounds and is running in the same direction at 3.0 mi/hr. Which of the following statements is true?-The momentum of player A is equal to that of player B.
-The momentum of player A is greater than that of player B.
-The momentum of player A is less than that of player B.

Answers

Answer:

the momentum of player A is greater than player B.

Therefore, Option 2 is correct.

Step-by-Step explanation:

We have been given the velocity of the players and mass of the players.

Player A:

Velocity is 5m/hr

Mass 210 pounds

Player B:

Velocity is 3m/hr

Mass 190 pounds

We have a formula for momentum:

$p=mv$

p is momentum

m is mass

v is velocity

We will find momentums for both the players:

Momentum of player A:

on substituting the values we get:

$p=210\cdot 5=1050 pounds$

Momentum of player B:

on substituting the values we get:

$p=190\cdot 3=570 pounds$

Hence, the momentum of player A is greater than player B.

Therefore, Option 2 is correct.

The equation for momentum is p = mv where p is the omentum, m is the mass and v is the velocity. Calculating the momentum for each football player, player A will have a momentum of 1050 lb-mi/h and player B will have a momentum of 570 lb-mi/h. Therefore, momentum of player A is greater than that of player B.

An object in projectile motion will follow wich path

Answers

It will tend to follow a trajectory path. When a projectile is being flung or flown away by a certain type of force, the trajectory is what it follows through the means of both force and function of time itself. It's also called as flight path.

Middle c has a speed of 1500 m/s in water and 340 m/s in air. does it have a longer or shorter wavelength in water than in air and why?

Answers

yes, it has a longer wavelength in water than in air.

How do evaporation and condensation relate to heat

Answers

Both of them are phase changes that result from the flow of heat. Evaporation happens when heat is added to a substance. Condensation happens when heat comes out of a substance.

Suppose you have two magnets. Magnet A doesn't have its poles labeled, but Magnet B does have a clearly labeled north and south pole. If these two are brought into contact with one another, which of the following could you expect? A. The side of Magnet A that's attracted to Magnet B's north pole must be Magnet A's north pole.
B. The side of Magnet A that's repelled by Magnet B's south pole must be Magnet A's north pole.
C. The side of Magnet A that's attracted to Magnet B's south pole must be Magnet A's north pole.
D. The side of Magnet A that's repelled by Magnet B's north pole must be Magnet A's south pole

Answers

Like poles of 2 magnets Repel each other and unlike poles attract each other. so the answer would be C. the side of magnet A that's attracted to Magnet B's South pole must be Magnet A's North pole.

The right answer here would be option C - the side of Magnet A that's attracted to Magnet B's south pole must be Magnet A's north pole. This is due to the magnetic rule of opposites attracting.

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