PHYSICS HIGH SCHOOL

What type of magnetism is present in a magnet that you use to place a photograph on the refrigerator? A. Induced
B. Superconducting
C. Contact
D. Permanent

Answers

Answer 1
Answer:

Answer:

C) Contact

Explanation:

The magnet requires almost direct contact with the fridge to start its magnetic properties.
Answer 2
Answer:

Answer:

Correct Answer is option D (permanent)

Explanation:

Permanent magnet

Permanent magnet is a magnet in which magnetic properties are present even in the absence of an external magnetic field. It has its own magnetic field.

Permanent type of magnetism is present in a magnet that we use to place a photograph on the refrigerator.This permanent magnet  is made up of powdered ferrite  and liquid plastic. The  mixture of ferrite and plastic is heated at a particular temperature and then this heated mixture is placed in a strong magnetic field. Due to this applied magnetic field this mixture is turned into a permanent magnet.

By this method of it requires less material to create a permanent magnet.

I hope this answer will help you.

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What happens when a ray of light is directed at a mirror, a glass block and a prism?

Double vision can be the result of

Answers

cross eyed can result in double vision

I have to make three videos for physics about Newton's three laws of motion but I don't want to be in the videos or talk in them. Any ideas on how I could do that?

Answers

Answer:

You should face your fears sometimes, and get in front of a crowd do present your ideas. Not everyone is good at it, and many people get anxious when they have to speak in front of people but it’s best if you just do it and get it over with and maybe it won’t be as intimidating next time :)

Rajahs are the slender towers of mosques. a. True b. False

Answers

The correct answer to the question stated above is FALSE.

Minarets,  also known as Goldaste, are the slender towers of mosques, not Rajahs. Rajahs are local hindu rulers.

>Minarets are distinctive architectural structures similar to a tower and typically found adjacent to mosques.

What causes flaming combustion to occur?Select one:
a. A solid fuel mixes with an adequate amount of liquid fuel to be able to sustain an open burning flame.
b. A gaseous fuel mixes with an adequate amount of oxygen and heats to ignition temperature.
c. A solid fuel encounters an open flame and entrains enough air to ignite.
d. A gaseous fuel encounters an external heat source and experiences piloted ignition.

Answers

The option that is correct as regards flaming combustion from the question is A solid fuel mixes with an adequate amount of liquid fuel to be able to sustain an open burning flame.

  • Combustion can be regarded as exothermic redox chemical reaction  which occurs at high temperature between fuel as well as an oxidant.

  • This oxidant is  usually atmospheric oxygen, and the results are mixture of gases which do appear as smoke.

  • For this flaming combustion to occur, there should be mixture of solid fuel as well as liquid fuel so that the burning flame can be sustained.

  • Flaming combustion takes place when both visible flames as well as  plume of a fire are visible.

Therefore,  option A is correct.

Learn more at:

brainly.com/question/14177748?referrer=searchResults

Answer is A(Soild Fuil

click the enlarge button to see the full answer.

A ball of moist clay falls 15.0 m to the ground. It is in contact with the ground for 20.0 ms before stopping. (a) What is the magnitude of the average acceleration of the ball during the time it is in contact with the ground?

Answers

Answer:

a= -0.86 m/s²

The negative sign shows that ball down the ground or moving down

Explanation:

Vf² - Vo² = 2gS

where

Vf = velocity of clay as it hits the ground

Vo = initial velocity of clay = 0

g = acceleration due to gravity = 9.8 m/sec^2 (constant)

S = distance travelled by clay = 15 m

Substituting appropriate values,

Vf² - 0 = 2(9.8)(15)  

Vf = 17.15 m/sec.

Formula to use is,  

V - Vf = aT

where

V = velocity of clay when it stops = 0

Vf = 17.15 m/sec (as determined above)

a = acceleration

T = 20 ms  

Put the values to find acceleration

a=(V-Vf)/T

a=(0-17.15)/20

a= -0.86 m/s²

The negative sign shows that ball down the ground

A train traveling 80.0 kph is blowing its horn as it approaches a railroad crossing. The horn has a frequency of 300.0 Hz. Assume the speed of sound is 331.5 m/s. What is the observed frequency of the horn?395 Hz

281 Hz

322 Hz

Answers

Answer:

322 Hz

Explanation:

v = speed of train approaching the railroad crossing = 80 km/h = 80 x 1000/3600 m/s = 22.22 m/s

V = speed of sound of the horn of train = 331.5 m/s

f = actual frequency of the sound from the horn = 300.0 Hz

f' = observed frequency of the horn

Using Doppler's effect, observed frequency is given as

f' = V f/(V - v)

inserting the values

f' = (331.5) (300.0)/(331.5 - 22.22)

f' = 322 Hz
the answer to your question is 322 hz
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