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What creates Earth's magnetic field? Choose the best answer from the selections below.


a

the hot, dense ball of solid iron at the Earth's inner core

b

hot swirling iron at the Earth's outer core

c

The north and south poles

d

magnetic force

When the block is inverted so that the steel is under water, the amount of the block submerged will remain the same. The portion of the block that was previously above the water level will now be submerged, while the portion that was submerged will now be above the water level.

In summary, when the block is inverted, the amount of the block submerged will increase and the water level in the tub will decrease. This is because the weight of the block acting on the submerged portion of the block is greater than the weight of the submerged portion of the block, causing the block to be lifted out of the water, and the volume of the submerged portion of the block is greater than the volume of the block, causing the water level to decrease.  

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Full Question ;

O A small piece of steel is tied to a block of wood. When the wood is placed in a tub of water with the steel on top, half of the block is submerged. Now the block is inverted so that the steel is under water. (i) Does the amount of the block submerged (a) increase, (b) decrease, or (c) remain the same? (ii) What happens to the water level in the tub when the block is inverted? (a) It rises. (b) It falls. (c) It remains the same.

Answer:

A good hand soap effectively kills germs without causing irritation or drying out your skin. For a cleanse that's both gentle on your skin and tough on germs, we looked for soaps made with moisturizing ingredients like olive oil, aloe vera, and glycerin.

Explanation:

Answer:

The can would be heavier.

Explanation:

The more rust is on the can, (Or object) the more it weights it down.

Answer:

The answer would be heavier, though it depends upon the type of metal. Rusting is essentially corrosion. Rust is often caused by a piece of metal getting soaked in water and then being exposed to oxygen. The rust will add more weight to the can so it becomes heavier.

With the same force, it would be stretched 16mm. A second wire made of the same material that is stretched by 4.0 mm has the same cross section but is twice as long.

An influence that can alter an object's motion is known as a force. A force can cause an object with mass to change its velocity, or accelerate (for example, moving from a condition of rest). Intuitively, a push or a pull can also be used to describe force.

A cross section is the non-empty intersection of a solid body and a plane in three dimensions, or its equivalent in higher dimensions. There are many parallel cross-sections produced when cutting an object into slices.

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Both E and B as 1/\(r^{8}\) so with distance from dipole, they will be changing in same manner. Hence far from the source of the magnetic field they will have same pattern.

An item known as a magnetic dipole generates a magnetic field that is analogous to the field produced by a pair of north and south magnetic poles. Several events can produce a magnetic dipole. North/South pole pairs, such as in permanent magnets, closed current loops, like in solenoids, and naturally occurring magnetic dipoles, like electrons, are examples of magnetic dipoles. These processes all produce magnetic fields that are thought to act like magnetic dipoles and have very similar magnetic field line patterns. The magnetic field lines for north/south pole pairs are roughly the same as those produced by a bar magnet.

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Answer:

The water filled balloon does not burst because the rubber obviously does not reach a temperature sufficient for it to melt or burn. The rubber is stretched thin so that heat is quickly transferred into the balloon. With air inside the balloon, this heat is not readily dissipated away from the spot touching the flame.

Answer:

i think its student b (d)

Explanation:

it might be student b cuz every action creates an equal and opposite reaction

Student B states that when she sits on the chair, the chair is actually exerting a force back on her in reaction to her force exerted upon the chair because of newton's third law. Hence, option D is correct.

The third law of Newton asserts that when bodies interact, they exert forces that are equal in size and directed in the opposite direction. Another name for the third law is the law of reaction and action. This law is crucial for understanding issues with static balance, where all pressures are in balance, but it also remains true for bodies moving at a constant or accelerated speed.

It doesn't only use bookkeeping methods; the forces it represents are actual forces. For illustration, a book laying on a table exerts downward pressure equal to the weight of the book on the table. The table produces an equal and opposite force on the book in agreement with the third law.

Therefore, student B is correct that because of Newton's third law there is an equal and opposite action and counteracts the student's so that neither move.

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To determine the mass of the rock, we need to use the formula for gravitational potential energy:
PE = mgh
where PE is the potential energy, m is the mass of the object, g is the acceleration due to gravity (9.8 m/s²), and h is the height the object is raised.

We know that the rock gains a potential energy of 500J when raised through a height of 3m. So we can substitute these values into the formula and solve for m:
500J = m x 9.8 m/s² x 3m
Simplifying this equation, we get:
500J = 29.4m
Dividing both sides by 29.4, we get:
m = 17.0 kg
Therefore, the mass of the rock is 17.0 kg.

In summary, the mass of the rock can be determined using the formula for gravitational potential energy and the given values for the potential energy and height. The calculated mass is 17.0 kg.

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Answer: It is the product of the (force)multiplied by the (perpendicular) distance from the line of action of the force to the pivot

Explanation:

Answer:

Mass of water: 43 g

Explanation

hope it helps

Answer:

Angular momentum is a vector quantity, meaning it has both magnitude and direction. The magnitude of angular momentum is given by the product of the moment of inertia and the angular velocity. Mathematically, it is represented as:

L = I * ω

where:

L is the angular momentum,

I is the moment of inertia, and

ω (omega) is the angular velocity.

The moment of inertia represents the rotational inertia of an object and depends on both the mass distribution and the axis of rotation. It is denoted by the symbol I.

The angular velocity (ω) represents how fast an object is rotating and is measured in radians per second.

The magnitude of angular momentum (L) depends on the values of the moment of inertia and the angular velocity. Increasing either the moment of inertia or the angular velocity will result in an increase in the magnitude of angular momentum.

It's important to note that angular momentum is conserved in a closed system when no external torques are acting on it. This conservation principle means that the total angular momentum of a system remains constant unless acted upon by external influences.

hope this is helpful for you :)

Direct measurement refers to the measurement that can directly measure the value of a physical quantity with instruments or measuring tools.

Indirect measurement refers to the measurement of a physical quantity that can be obtained only after mathematical operations.

Direct measurement involves using a measuring instrument or tool to directly obtain the value of a physical quantity.

For example, using a ruler to measure the length of an object, or using a thermometer to measure the temperature of a substance.

The measurement obtained is a direct representation of the quantity being measured.

Indirect measurement, on the other hand, requires additional mathematical operations or calculations to determine the value of a physical quantity.

This can involve measuring other related quantities and using mathematical formulas or equations to derive the desired quantity.

For instance, calculating the volume of an irregularly shaped object by measuring its dimensions and applying the appropriate formula.

Direct measurement provides a straightforward and immediate result, as it directly measures the physical quantity using instruments or tools.

Indirect measurement requires additional steps and calculations to obtain the desired quantity, making it a more involved process.

Both direct and indirect measurement methods have their applications and usefulness in various scientific and practical contexts.

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Answer: The image formed by a plane mirror is always virtual (meaning that the light rays do not come from the image), upright and of the same shape and size as the object it is reflecting.

Answer: B. The angle when it leaves is the same as the angle when it hits

Explanation:

Apex

Answer:

false

Explanation:

every object will always have the force of gravity acting upon it.

The energy needed to raise the temperature of 1 kg of lead from 40 °C to 60°C will be 2600 Joules.

We can calculate the energy of a substance by using the given formula:

Q = mc∆T

where;

Q = quantity of heat absorbed or released

m = mass of the substance

c = specific heat capacity

∆T = change in temperature(°C)

Now, according to the given question, 1 kg of lead has to be raised from 40°C to 60°C and we also have the specific heat capacity(c) of lead that is 130J/kg°C.

We can calculate the energy by putting the given values in the above equation:

Q = mc∆T

= 1 × 130 × (60-40)

= 20 × 130

Q = 2600J

Therefore, the amount of energy required to raise the temperature of 1 kg of lead from 40°C to 60°C is 2600J.

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Answer:

16Hz

Explanation:

Given parameters:

Speed of sound  = 400m/s

Wavelength  = 25m

Unknown:

Frequency of the wave  = ?

Solution:

To solve this problem;

      V  = F ∧  

V is the velocity

F is the frequency

∧ is the wavelength

      400  = F x 25

        F  = 16Hz

Answer:

16 hertz... I got it right on study-island

Explanation:

It would take 1.556 seconds for the barrier to crumple and safely slow down the person with a force of 1180 N.

To calculate the time required to crumple the barrier and safely slow down the person, we can use the concept of impulse.

The impulse, denoted by J, is defined as the product of force and time, and it represents the change in momentum of an object. In this case, the impulse required to safely slow down the person can be calculated using the maximum force and the person's initial momentum.

The momentum of a person is given by the product of their mass and velocity:

Momentum = mass × velocity

Given that the person's mass is 68 kg and their velocity is 27 m/s, the initial momentum is:

Initial momentum = 68 kg × 27 m/s

To safely slow down the person, the impulse provided by the barrier should be equal to the change in momentum.

Therefore, we have:

Impulse provided by barrier = Final momentum - Initial momentum

Since the person is brought to rest, the final momentum is zero. Thus, we have:

Impulse provided by barrier = -Initial momentum

Now we can express the impulse in terms of force and time:

Impulse provided by barrier = Force × Time

Plugging in the known values, we can solve for time:

-Initial momentum = Force × Time

68 kg × 27 m/s = 1180 N × Time

Simplifying the equation, we find:

Time = (68 kg × 27 m/s) / 1180 N

Evaluating the expression:

Time = 1836 kg·m/s / 1180 N

Finally, converting kg·m/s to seconds, we get:

Time ≈ 1.5559 seconds

Therefore, it would take approximately 1.556 seconds for the barrier to crumple and safely slow down the person with a force of 1180 N.

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Answer:

D. Malleable

Explanation:

Gold is metallic, with a yellow colour when in a mass, but when finely divided it may be black, ruby, or purple. It is the most malleable and ductile metal; 1 ounce (28 g) of gold can be beaten out to 300 square feet. It is a soft metal and is usually alloyed to give it more strength.

The drawbacks of burning fossil fuels to generate power include their role in climate change and air pollution, their limited supply, and the environmental harm that their extraction and transportation create.

Our infrastructure is essentially based on the usage of fossil fuels, which are relatively cheap, and abundant, and on which we rely extensively to produce electricity. Furthermore, many individuals might not be aware of the harmful effects that using fossil fuels has on the environment or might not have access to alternate energy sources.

Because they emit few to no greenhouse gas emissions or other pollutants, renewable energy sources like solar, wind, and hydropower are typically regarded as the least damaging to the environment. Furthermore, they do not generate toxic waste or need to mine or dig for fuel. Yet, depending on elements like the location of the power generation facilities and the materials employed in the manufacture of renewable energy technology, the environmental impact of renewable energy sources might change.

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Answer:

9.8×104Nm−2,0.025,3.92×106Nm−2

Solution :

Here, L=10cm=10×10−2m

F=100kgf=100×9.8N

ΔL=0.25cm=0.25×10−2m,

Shearing stress =FL2=100×9.8(10×10−2) Sheraing strain =ΔLL=0.25×10−210×10−2 = 0.025 Shear Modulus of elasticity, G=Shearing stressShearing strain=9.8×1040.025

=3.92×106Nm−2

Explanation:

When you cover the top half of a lens that is forming an image on a screen, the bottom half of the image disappears. And when you cover the bottom half of the lens, the top half of the image disappears. Thus, the correct answer is C.

It happens because the image of an object is formed on the screen by the refraction of light from different points on the object passing through different parts of the lens. The upper part of the lens forms an image of the lower part of the object, while the lower part of the lens forms an image of the upper part of the object. Hence, when the top half of the lens is covered, the bottom half of the object is not visible on the screen, and when the bottom half of the lens is covered, the top half of the object is not visible on the screen. Option C.

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The substance is zircon, of which interference analysis is done.

Wavelength of light in solid = λ = 329 nm

Wavelength of light from he-ne laser = λ' = 633 nm

Interference effect = n =

= n =  λ' / λ

= n = 633 / 329

= n = 1.92

The interference, in physics, is the net effect of the combination of two or more wave trains moving on intersecting or coincident paths. The effect is that of the addition of the amplitudes of the individual waves at each point affected by more than one wave.

Thus the substance is zircon.

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The correct answer to the question is (b) Convert some other form of energy into electrical.

The basic function of an electromotive force in a circuit is to convert some other form of energy into electrical energy. This is achieved through the movement of charged particles, such as electrons, which create a flow of current in the circuit. Electromotive force is commonly represented by the symbol "EMF" and is measured in volts.

An EMF can be generated by various sources, including batteries, generators, and solar cells. In each case, the EMF converts some form of energy (chemical, mechanical, or radiant) into electrical energy that can be used to power devices or perform work.

It is important to note that an EMF does not create energy, but rather it converts energy from one form to another. For example, a battery does not create energy, but instead it converts chemical energy into electrical energy. Similarly, a generator converts mechanical energy into electrical energy.

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Answer: Well that's an easy one. Your mother birthed you but you are still alive today because you choose to continue to push forward and strive to live. As humans we all have struggles but some of choose to strive or sit in our humiliation like a kicked puppy. Pick your option.

Two points P and Q on a progressive wave are separated by distance d. The phase difference between P and Q is rad. The wavelength of the wave would be 8 times the distance between points P and Q.

In a progressive wave, the phase difference between two points is related to the wavelength of the wave. To find the wavelength (λ) given the phase difference (ϕ) and the distance (d) between two points, we can use the formula:

ϕ = 2π(d/λ)

Rearranging the equation to solve for λ, we have:

λ = (2πd) / ϕ

In this case, the phase difference between points P and Q is given as ϕ radians. The distance between these points is denoted by d. By substituting these values into the equation, we can determine the wavelength of the wave.

It's important to note that the phase difference is typically measured in radians, and one complete wave cycle corresponds to 2π radians.

For example, let's say the phase difference between points P and Q is π/4 radians, and the distance between them is d. Using the formula above, the wavelength would be:

λ = (2πd) / (π/4)

λ = (8πd) / π

λ = 8d

This calculation demonstrates how the phase difference and distance between points on a wave are related to the wavelength. By knowing the phase difference and distance, we can determine the wavelength of the wave using the formula derived from the wave's periodic nature.

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Explanation:

→ Volume of cone = πr² × h/3

Here,

→ Volume of cone = π(13)² × 27/3 cm³

→ Volume of cone = 169π × 9 cm³

→ Volume of cone = 1521π cm³

→ Volume of cone = 1521 × 22/7 cm³

→ Volume of cone = 33462/7 cm³

→ Volume of cone = 4780.28 cm³

Answer:

4,778.4 is correct

Explanation:

The label match up to the correct location is given below

An earthquake is a natural disaster that is caused by the movement of tectonic plates in the Earth's crust. These plates can either collide, move apart, or slide past each other, and the resulting energy release is what causes earthquakes.

Earthquakes are typically measured using a seismograph, which records the ground movement caused by the earthquake, and are rated on the Richter scale, which measures the intensity of the earthquake.

A volcano is a geological feature that is formed when magma from the Earth's mantle rises up to the surface and erupts.

Lastly, Volcanoes can also cause earthquakes, as the movement of magma can cause the ground to shift. Volcanoes are often classified based on their eruptive style, with some being more explosive and others being more effusive.

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Answer:

Measured on the Richter scale - Earthquake

Measured using a seismograph- Earthquake

Caused by subduction -Earthquake

Lava comes out - Volcano

Forms a mountain -Volcano

Natural hazard-  Both

Occurs underwater - Both

Explanation: I got the person above mine's wrong on Edmentum, but then realized Volcanoes can also happen underwater, so I switched that one.

Answer:

White

Explanation:

Red comes from the lowest energy range of and blue from the highest.

Answer:

B

Explanation:

While answer C may sound correct, Answer B is makes more sense. We know you cant use High-beam lights when u cant see ongoing traffic because it could affect the other driver coming across from you. Its good to use it when legal and safe, but in that term I still don't believe there's no reason for HIGH-beamed. That's this leaves B, when you are on u lighted streets.

The pair of objects that experiences the largest gravity force is an apple and a brick

An object will be weightless in outer space, away from the gravitational field of Earth (or another massive planet), yet it will still have mass and consequently resistance to a given force.

When one body has a higher mass than another, it is said to be more massive. The electron, with a mass of about 9.11 10-31 kg, is one of the Universe's least massive things. Hence, the combination of a proton and electron would experience the least gravity force. The combination of an apple and a brick has the most mass hence would experience the largest gravity force. Two apples or an apple and a proton are less massive compared to an apple and a brick thus incorrect.

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