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Hunter-Best [27]
3 years ago
14

Which statements about Earth’s core help explain Earth’s magnetic field? Check all that apply.

Physics
2 answers:
blsea [12.9K]3 years ago
6 0

Answer: The outer core is liquid and moving.

Earth’s core is composed of iron and nickel.

Explanation:

A magnetic field is produced by a magnetic material such as Iron, Cobalt or Nickel. Magnetic field are magnetic lines of force i.e. the region which experiences magnetic force. Earth acts as a huge bar magnet and has magnetic field around it due to which we are shielded by solar particles and experience phenomenon such as Auroras.

The earth acts as bar magnet due to presence of iron and nickel in molten form in its core. The outer core is liquid and moves generating a magnetic field. Thus, the correct options are:

The outer core is liquid and moving.

Earth’s core is composed of iron and nickel.

Stella [2.4K]3 years ago
5 0

All the statements can be used to explain about Earth's magnetic field.

Earth's magnetic field is almost same to that of the bar magnet. The magnetic field of the earth occurs from its core. It has an inner core which is solid in nature. in the outer core, there is a motion of the liquid due to heat flow from the inner core to the core mantle boundary which proves that the outer core is liquid and moving. The Earth's core consists of iron and nickel as the Eddy currents in the iron and nickel liquid helps generating the Earth's magnetic field.

Hence, all the three statements are true and can be used to explain the Earth's magnetic field.

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Identify a mechanical wave that is also a longitudinal wave
nexus9112 [7]
Mechanical waves, it needs a certain medium to travel through. This medium can be a solid, liquid and gas. There are three types of mechanical waves namely, sound wave, water, and waves through the ropes.

A longitudinal wave is a wave that vibrates in a parallel direction with the motion. Also known as a compression wave. Both mechanical and longitudinal waves produce a sound.
7 0
3 years ago
A boy with a mass of 25 kg is sitting in a red wagon of mass 8.5 kg which is at rest. His friend begins pulling him forward, acc
tangare [24]

So, the force that given when the wagon was being pulled is approximately <u>19.1 N (C)</u>.

<h3>Introduction</h3>

Hi ! For intermesso, this question will adopt a lot about the relationship of impulse to change in momentum. <u>Impulse is the total force applied in a certain time interval</u>. Impulses can cause a change of momentum, because momentum itself <u>is a mass that is affected by the velocity of an object</u>. We know that velocity is a vector quantity easy to change its direction. The relationship between impulse and change in momentum is formulated by :

\sf{I = \Delta p}

\sf{F \cdot \Delta t = (m \cdot v') - (m \cdot v)}

\boxed{\sf{\bold{F \cdot \Delta t = m (v' -v)}}}

With the following condition :

  • I = impulse that given (N.s)
  • \sf{\Delta p} = change of momentum (kg.m/s)
  • F = force that given (N)
  • m = mass of the object (kg)
  • v = initial velocity (m/s)
  • v' = final velocity (m/s)
  • \sf{\Delta t} = interval of the time (s)

<h3>Problem Solving</h3>

We know that :

  • m = mass of the object = 25 kg
  • v = initial velocity = 0 m/s
  • v' = final velocity = 1.8 m/s
  • \sf{\Delta t} = interval of the time = 2.35 s

What was asked :

  • F = force that given = ... N

Step by step :

\sf{F \cdot \Delta t = m (v' -v)}

\sf{F \cdot 2.35 = 25 (1.8 - 0)}

\sf{F = \frac{25 (1.8)}{2.35}}

\boxed{\sf{F = 19.15 \: N \approx 19.1 \: N}}

<h3>Conclusion</h3>

So, the force that given when the wagon was being pulled is approximately 19.1 N (C).

6 0
3 years ago
A cylindrical conductor of length l and uniform area of cross section A has a resistance R. Another conductor of length 2l and r
ella [17]

Answer:

2A

Explanation:

The resistance of a wire can be defined as

R = ρL/A

Where,

ρ is Resistivity  - the factor in the resistance which takes into account the nature of the material is the resistivity

L is Length of the conductor

A is Area of cross section of the conductor.

R₁/R₂ = (L₁/L₂) × (A₂/A₁)  ----> rearranging it for A

A₂ = (R₁/R₂) × (L₂/L₁) × A₁  

A₂ = (R/R) × (2L/L) × A  

A₂ = 2A

Therefore, cross section area of another conductor must be 2A

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Answer:

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Explanation:

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using a lever to move a rock reduces the force a person must exert. what does it do to the work the person must do?
morpeh [17]

Using a lever to move a rock reduces the force a person must exert . It also reduces the work (effort ) the person must do.

Using a lever decreases the input force required to lift up the load, for example if a force of 900N is required to lift the load without a lever . Using the lever the input force decreases to 500N and as we all know by the formulae of work done :

Work done ∝  force applied

By this equation we can conclude that if the force to be applied on the load reduces by the use of a lever therefore the work to be done on the load will also reduce .

You can get a additional information about the lever system below :

brainly.com/question/3522307

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