Plz help me. I need urgent Why a magnetic compass is used to determine direction? Why a nail gets magnetized when kept close to magnet? Why two pins get attracted by bar magnet maintain distance between ends?

Answers

Answer 1

Answer:

Compasses are mainly used in navigation to find direction on the earth. This works because the Earth itself has a magnetic field which is similar to that of a bar magnet. The compass needle aligns with the Earth's magnetic field direction and points north-south. Also, In a magnet all the domains are oriented in the same direction. In the case of a nail, the domains can be aligned in the same direction causing the nail to become magnetic. That is because if you hang a bar magnet from a thread, the north pole will point to magnetic north. When you bring one north pole close to another north pole they repel each other. You can feel the two magnets pushing each other apart.


Related Questions

A 2 kg ball is dropped from the roof of a building 27.5 m tall. How long
does it take to hit the ground?

Answers

Answer:

wow I need time to solve dis

The number of proton in a atom of 3H1 is

Answers

Answer:

5th hhssjn wixi. sjxbwjs. bajz wjxhqjzisjnisja

Answer:

the answer is 1

Explanation:

Does the earth emit visible light or heat

Answers

Answer:

Heat

Explanation:

the earth visible heat

Ravi, Rajiv and Shyam are sitting inside a room. The body temperature of. Ravi, Rajiv and Shyam are 35.8 ℃, 36.2 ℃ and 36.4 ℃. It is given that the temperature of air present in the room is 36.1 ℃. Who among them will feel cold? Give Reason, please reply as soon as possible!! (explanation needed).

Answers

Answer:

"Cold" in this case, is defined as a difference between the body temperature and the room/ambient temperature.

If the body temperature is higher than the room temperature, then the "sensors" in our skin will sense that the ambient temperature is lower than ours, then we feel "cold"

The room temperature is: 36.1°C.

The higher body temperature is the one of Shyam, 36.4°C

The difference is really small:

36.4°C - 36.1°C = 0.3°C

But still, he will feel the room a little cold for him

Which is directly proportional to your weight on a planet's surface?
A. Only the mass of the planet
B. The distance from the surface to the center of the planet
C. Only your mass
D. Your mass and the mass of the planet

Answers

Answer:

D your mass  the mass of the planet .

Explanation:

Answer: your mass and the mass of the planet

Explanation:

A car, initially traveling 24.0ft/s, steadily speeds up to 58.0ft/s in 5.40s. Determine all unknowns and answer the following question.

How far did the car travel during this time?

Answers

Answer:

acceleration = 6.29 ft^2/s

distance traveled by car = 405 ft

Explanation:

formula 1 : u = v - (a*t)

where u = initial velocity

v = final velocity

a = acceleration

t = time.

solving for acceleration.

24 = 58 - (a*5.4)

a = (58 - 24)/ 5.4

a = 340/ 54 = 6.29 ft^2/s

formula 2: v = d/t - (a*t/2)

58 = d/5.4 - ((340*54)/20)

d = 405 ft

What happens to the chemical structure of water when it changes state?
A. Water molecules break apart to form individual atoms.
B. Water molecules harden into ice molecules.
C. Water molecules melt into gas molecules.
D. Nothing happens to the chemical structure.

Answers

Answer:

c) Water molecules melt into gas molecules.

The chemical structure of water when it changes state - D. Nothing happens to the chemical structure.

Physical state of an object is the condition where substance have different energy content. For instance water is on heating it change into vapor or gaseous phase while cooling (decreasing heat content) causes water to become ice in solid phase. Therefore,

physical states is only in the energy content of the substance.Change in the state or phase of water does not change the chemical property. However, changing phase can alter the speed of the chemical reactions.

Thus, the change in physical state do not affect chemical properties, but affects the kinetics of the reactions.

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What is the phase of water when its temperature is 150 °C?

Answers


Depending on how much energy is in the system, there will be different amounts of liquid and gas at equilibrium. If just enough energy was added to raise the temperature of the liquid to 150°C, there will just be liquid. If more was added, there will be some liquid and some gas.

what is acceleration of a 12 kg cart if a net force of 144 N is applied on it?​

Answers

Answer:

The correct answer is I just did the quiz

Force,F=144N

Mass,m=12Kg

Force=Mass*Acceleration

144=12*a

12a=144

a=12

5p - 14 = 8 p + 4 find p

Answers

Answer:

Explanation:

5p - 14 = 8p + 4

5p = 8p + 18 <-- Moving constants to one side; add the same number of +14 to both sides.

-3p = 18. <-- The same thing with the variable itself.

p = -6 <-- Divide both sides by negative 3.

Physical Science
convert 5.3 hl to dal

Answers

Answer: 53 dal

Explanation: 5.3x10=53, to get dal you have to multiply by 10 to get 5.3x10=53.

Hope this helped! Please mark Brainliest!

A hot air balloon is traveling vertically upward at a constant speed of 7.0 m/s.
When it is 21 m above the ground, a package is released from the balloon. For
how long is it in the air?

Answers

Answer:

The time spent in air by the package is 1.5 s

Explanation:

Given;

speed of the balloon, v = 7.0 m/s

distance traveled by the balloon, d = 21 m

The time spent by the object in the air is give by;

d = vt + ¹/₂gt²

21 = 7t + ¹/₂(9.8)(t²)

21 = 7t + 4.9t²

4.9t² + 7t -21 = 0

solve this quadratic expression, and the value of t will be

t = 1.5 s

Therefore, the time spent in air by the package is 1.5 s

100 POINTS UP FOR GRABS FOR ANYONE WILLING TO HELP! PLEASE!

Answers

Answer:

how can I download your doc it's not getting on please help I want to answer your question. you take a screenshot and send once more on this is it okkk.

Explanation:

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Jan ran 4 miles north in 28 minutes. What was Jan's average velocity?

Answers

Answer:

3.83 m/s

Explanation:

Given that,

Distance covered by Jan, d = 4 miles

1 mile = 1609.34 m

4 miles = 6437.38 m

Time, t = 28 minutes = 1680 s

Jan's average speed,

v = d/t

[tex]v=\dfrac{6437.38\ \text{m}}{1680\ \text{s}}\\\\v=3.83\ \text{m/s}[/tex]

Hence, the average velocity of Jan is 3.83 m/s.

The area of a triangle is 30 m². Using the equation A=12bh A = 1 2 b h , where b is base and h is height, solve for h if b = 3 m. Round to three decimal places, if necessary.

Answers

Answer:

20 metres

Explanation:

Given that the area of a triangle is 30 square metres (m²). Using the equation A = 1/2bh, this is the formula for the triangle.

where b is base and h is height

Given that b = 3 metres.

To calculate h, Substitute b and A into the equation

30 = 1/2 × 3 × h

3h = 60

h = 60/3

h = 20 m

Therefore, h is equal to 20 metres

which of the following best describes inertia?

a) Inertia is the same as mass
b) Inertia is a result of net force
c) Inertia is the ability of an object to change its motion
d) Inertia is the tendency of objects to resist changes in its motion​

Answers

Answer : D
Explanation: Intertia is the resistance of any physical object to change its velocity

Answer:

d) inertia is the tendency of object's to resist changes in its motion

How much miles is it from the surface to center of earth

Answers

The average is 3,959 miles.

it is 3,959

Explanation:

hope this helps you.

does uniform acceleration means increasing acceleration?

Answers

Yes. It means that the acceleration increases at a constant rate, for example 3 mph every second.

how many meters does it take to make one mile ​

Answers

Answer:

1610 meters

Explanation:

Answer:

1609.344 Meters

Explanation:

There is no explanation

If a swimmer is traveling at a constant speed of 2 m/s, how long would it
take to swim the length of a 50-meter Olympic sized pool ?*

Answers

Yeah so 50-meter Olympic sized pool would be 25 mm

Lucy took 3 hours to cover 2/3 of a journey. She covered the
remaining 60 miles in 2 hours. What was the average speed
for the whole journey?
mph

Answers

Deleted this answer, sorry for any inconveniences that it may have caused.

your uncle danny just moved into a new apartment and wants to make his famous spaghetti sauce for his new neighbors

Answers

Answer:

he invs them

Explanation:

its common sense

Answer:

He invs them.

Explanation:

What is radiation? Transfer of heat through objects touching the source. Transfer of heat through direct physical contact. Transfer of heat through electromagnetic waves. Transfer of heat through the movement of particles.

Answers

Answer:

Transfer of heat through electromagnetic waves

Answer:

Transfer of heat through electromagnetic waves.

I got it right in a test

a 50-kg object moving at 12 m / s has a momentum of 600 kg m / s what is the mass of an object moving at 4 m/s has the same momentum

Answers

Explanation:

p=mv

600kgms-1=m × 4ms-1

m=600kgms-1/4ms-1

m=150kg

The mass of the object which has momentum of 600kgm/s with the velocity of 4m/s is 150kg.

What is Momentum?

Momentum is the product of the mass and velocity of the object. Momentum is the quantity of motion which is made up of the amount of matter moved and the velocity at which it moves. Momentum is a vector quantity because it has both the magnitude and direction. The SI unit of momentum is kg.m/s (kilogram meter per second).

p = m × v

p = momentum of the object,

m = mass of the object,

v = velocity of the object

600kgm/s = m × 4m/s

m = 600/ 4

m = 150kg

Therefore, the mass of the object will be 150kg.

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If the distance between two charged particles is doubled, the force between them changes by a factor of ___. (1 point)
1/2
1/4
2
4

Answers

Answer:

decreases 1/4 of the original value

If the distance between two charged particles is doubled, the force between them changes by a factor of 1/4.

What is force?

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Force between two charge particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

If the distance between two charged particles is doubled, the force between them changes by a factor of 1/4.

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A car travels 200 miles in 8 hours calculate the cars speed

Answers

Answer:

25 mi/hr

Explanation:

Distance = 200 miles

Time = 8 hours

[tex]Speed = \frac{Distance}{Time}[/tex]

Substitute values into the given equation and solve.

[tex]Speed = \frac{200}{8} \\\\Speed = 25 \:miles/hour[/tex]

A car travels 200 miles in 8 hours is 25 miles/h (25 mph).

What is Speed?

The speed of an object is defined as the magnitude of change of its position with time or the magnitude of change of its position per unit time. It is a scalar quantity which has only magnitude , no direction.

It can be expressed as:

[tex]s = \frac{d}{t}[/tex]

s = speed

d = distance traveled

t = time elapsed

The SI unit of speed is metre per second. (m/s)

For above given information,

Distance = 200 miles

Time= 8 hours

So, speed will be 200 miles/ 8 hrs

Speed = 25 miles/hr or 25 mph.

Thus , a car travels 200 miles in 8 hours is 25 miles/h (25 mph).

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There are 100 simple pendulums in a room having identical bobs which are displaced to different extents but only 25 of these pendulums have different time periods. What do you think would be the reason?

Answers

Explanation:

The time period of a simple pendulum is given by :

[tex]T=2\pi \sqrt{\dfrac{L}{g}}[/tex]

L is length of the pendulum and g is acceleration due to gravity

It is very much clear that the time period depends on the length of the pendulum.

In this problem, there are 100 simple pendulums in a room having identical bobs which are displaced to different extents but only 25 of these pendulums have different time periods. The only reason for 25 pendulums having different time periods is that they have different lengths than the other 75 pendulums.

A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 40.0 min at 50.0 km/h, 8.0 min at 70.0 km/h, and 35.0 min at 35.0 km/h and spends 40.0 min eating lunch and buying gas. Determine the average sped for the trip. Determine the difference between the intial citties along the route.

Answers

Answer:

Average speed = 40.50 km/h (Approx)

Explanation:

Distance = Time × Speed

Total distance = (40/60) 50 + (8/60) 70 + (35/60) 35

Total distance = 33.33 km + 9.33 km + 20.17 km

Total distance = 62.80 km

Average speed = Total distance / Total time taken

Average speed = 62.80 / [(40+8+35+40)/60]

Average speed = 62.80 / 1.55

Average speed = 40.50 km/h (Approx)

What is the velocity of the object moving from 3 - 7 seconds?
O m/s
-6 m/s
6 m/s

Answers

That's the flat-top marked ' B '.

It's 6 m/s.

In a study, the data you collect is Habits on a Always/Sometimes/Never scale.What is the level of measurement?

Answers

Answer:

Ordinal

Explanation:

There are four levels of measurement which include the nominal, ordinal, interval, and ratio. The data collected above is ordinal data as it qualifies the data and still indicates the ordering of the data. It gives the observer an idea of the range of data collected or its rating although mathematical calculations may not be done with it.

The other forms of data include the nominal which simply qualifies the data, the interval which qualifies the data but which the differences between the data can be obtained, and of course the data has no starting point. The ratio scale which is similar to the interval scale but which the ratios between the data obtained can be compared.

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