the presence of which magnetic feature best explains why a magnet can act a distance on other magnets or on objects containing certain metals

Answer:

0.15kg/m³

Explanation:

Density = mass/ volume

Given that

Mass = 150kg

Note that volume = length x breadth x height

Volume = 20 x 10 x 5

Volume = 1000m³

Density = mass ➗ volume

Density = 150kg ➗ 1000m³

Density = 0.15kg/m³

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Final answer:

The density of the substance is calculated by dividing its mass by its volume. With a mass of 150kg and volume of 1000m³, the density is 0.15 kg/m³.

Explanation:

To find the density of a substance, you need to divide its mass by its volume. The given mass of the substance is 150kg, and the dimensions provided are 20m by 10m by 5m. First, you have to calculate the volume by multiplying these dimensions together:

Volume = length × width × height = 20m × 10m × 5m = 1000m³.

Now, you can calculate the density using the formula:

Density = mass / volume = 150kg / 1000m³.

Therefore, the density of the substance is 0.15 kg/m³.

Answer:

13 m/s

Explanation:

Momentum is conserved, so initial total momentum = final total momentum.

m₁ u₁ + m₂ u₂ = m₁ v₁ + m₂ v₂

Since Car B is originally not moving, u₂ = 0.

m₁ u₁ = m₁ v₁ + m₂ v₂

Since the cars stick together, they have the same final velocity, so v₁ = v₂ = v.

m₁ u₁ = m₁ v + m₂ v

m₁ u₁ = (m₁ + m₂) v

Given that m₁ = 1800, m₂ = 1500, and v = 7.1:

1800 u₁ = (1800 + 1500) 7.1

u₁ = 13

Car A was travelling at 13 m/s.

6a) Acceleration of the bullet: [tex]1.44\cdot 10^5 m/s^2[/tex]

6b) Final velocity of the bullet: 360 m/s

7a) Acceleration of the truck: [tex]1.50 m/s^2[/tex]

7b) Net force on the truck: 54,000 N

7c) The acceleration will triple

Explanation:

6a)

The acceleration of the bullet can be found by using Newton's second law, which states that the net force acting on an object is equal to the product between the mass of the object and its acceleration:

[tex]F=ma[/tex]

where

F is the force

m is the mass

a is the acceleration

For the bullet in this problem, we have

F = 3600 N (force)

m = 0.025 kg (mass of the bullet)

Therefore, the acceleration is

[tex]a=\frac{F}{m}=\frac{3600}{0.025}=1.44\cdot 10^5 m/s^2[/tex]

6b)

The motion of the bullet is a uniformly accelerated motion, so we can use the following  suvat equation:

[tex]v=u+at[/tex]

where

u is the initial velocity

v is the final velocity

a is the acceleration

t is the time elapsed

In this problem, we have:

u = 0 (the bullet starts from rest)

t = 0.0025 s (time)

[tex]a=1.44\cdot 10^5 m/s^2[/tex] (acceleration)

So we can solve to find v, the final velocity of the bullet as it leaves the rifle:

[tex]v=0+(1.44\cdot 10^5)(0.0025)=360 m/s[/tex]

7a)

The acceleration of a body is defined as the rate of change of its velocity:

[tex]a=\frac{v-u}{t}[/tex]

where

u is the initial velocity

v is the final velocity

t is the time taken for the velocity to change from u to v

a is the acceleration

For the truck in this problem, we have

u = 0 (it starts from rest)

v = 28 m/s (final velocity)

t = 18.7 s (time elapsed)

Substituting, we find the acceleration

[tex]a=\frac{28-0}{18.7}=1.50 m/s^2[/tex]

7b)

The net force on the truck can be calculated using Newton's second law:

[tex]F=ma[/tex]

where

F is the force

m is the mass

a is the acceleration

For the truck in this problem,

m = 36,000 kg is the mass of the truck

[tex]a=1.50 m/s^2[/tex] is the acceleration

So, the net force on the truck is

[tex]F=(36,000)(1.50)=54,000 N[/tex]

7c)

We said that the relationship between the net force on the truck and its acceleration is

[tex]F=ma[/tex]

The equation can be rewritten as

[tex]a=\frac{F}{m}[/tex]

We notice that the acceleration is directly proportional to the acceleration.

Here we are told that the net force on the truck is tripled, therefore

[tex]F'=3F[/tex]

As a consequence, the new acceleration of the truck would be

[tex]a'=\frac{F'}{m}=\frac{3F}{m}=3\frac{F}{m}=3a[/tex]

So, the acceleration also triples.

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The acceleration is [tex]-3.1 m/s^2[/tex]

Explanation:

The acceleration of an object is the rate of change in velocity of the object.

Mathematically, it is given by

[tex]a=\frac{v-u}{t}[/tex]

where

u is the initial velocity

v is the final velocity

t is the time taken for the velocity to change from u to v

For the car in this problem, we have:

u = +20 m/s

v = 0 (because the car comes to a stop)

t = 6.5 s (time taken)

Therefore, the acceleration is

[tex]a=\frac{0-(+20)}{6.5}=-3.1 m/s^2[/tex]

Where the negative sign means that the direction of the acceleration is opposite to the direction of the initial velocity.

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Answer:

The answer is A!

Explanation:

A is for A+! I also got the correct answer on UsaTestPrep!

Answer:

Reflection impacts a change in direction of waves when they bounce off a barrier. When a wave confronts a barrier with a hole or gap, which is much smaller than the wavelength, the wave bends and spreads out as a spherical circular wave.

Explanation:

If you have any questions feel free to ask in the comments - Mark

Also when you have the chance please mark me brainliest.

Answer:

Reflection impacts a change in direction of waves when they bounce off a barrier. When a wave confronts a barrier with a hole or gap, which is much smaller than the wavelength, the wave bends and spreads out as a spherical circular wave.

Explanation:

Answer:

its cognitive- behavioral psychology

hope u have a good day!! :)

Answer:

D

Explanation:

just did the test

Answer:

Explanation:

Folic acid is the form of folate found in vitamin supplements and fortified foods. Fortified foods, also called enriched foods, are foods that have specific nutrients added to them.

Neural tube defect happen when the tissues and bone around the brain and spine do not grow well. Neural tube can happen in the third and fourth week after conception (the first or second week after your first missed period). This could be before you know that you are pregnant.

Folic acid lowers the risk of your unborn baby having a neural tube defect . Neural tube are a group of serious birth defects that affect a baby’s spinal cord, brain and skull. Some babies with severe Neural tube defect birth are stillborn or do not survive long after birth. Spina Bifida is the most common Neural tube defect.

Answer:

Linear and rotational Kinetic Energy + Gravitational potential energy

Explanation:

The ball rolls off a tall roof and starts falling.

Let us first consider the potential energy or more specifically gravitational potential energy ([tex]mgh[/tex]; [tex]m[/tex] = mass of the ball, [tex]g[/tex] = acceleration due to gravity, [tex]h[/tex] = height of the roof). This energy comes because someone or something had to do work to take the ball to the top of the roof against the force of gravity. The potential energy is naturally maximum at the top and minimum when the ball finally reaches the ground.

Now, the ball starts to roll and falls off the roof. It shall continue rotating because of inertia (Newton's first law). This contributes to the rotational kinetic energy ([tex]\frac{1}{2}I\omega^2[/tex]; [tex]I[/tex]=moment of inertia of the ball & [tex]\omega[/tex] = angular velocity).

Finally comes the linear kinetic energy or simply, kinetic energy ([tex]\frac{1}{2}mv^2[/tex]) which is caused due to the velocity [tex]v[/tex] of the ball.

Answer:

Ultraviolet radiation.

1.358 J is the kinetic energy of the car driven by Mrs. Waid.

Explanation:

Given data:

Velocity at which Mrs. Waid drives her car = 80 mph

In order to convert mph (meter per hour) into mps (meter per second),

         [tex]\frac{80}{3600}=0.0222 \mathrm{m} / \mathrm{s}[/tex]

Car weighs 2500 lbs, means mass of the car, m = 2500 lbs

I kilo gram = 2.20462 pound

Therefore, 1 pound (lb)=  0.45359237 kilograms (kg).

To converting pounds into kilogram,

               [tex]\frac{2500}{0.45359237}=5511.55 \mathrm{kg}[/tex]

As we know, the kinetic energy can be defined as directly proportionate to the object’s mass (m) and square of its velocity (v). The expression can be given as below,

               [tex]\text { kinetic energy }(K . E)=\frac{1}{2} \times m \times v^{2}[/tex]

By substituting the given values, we get

              [tex]\text { kinetic energy }(K . E)=\frac{1}{2} \times 5511.55 \times 0.0222^{2}[/tex]

              [tex]\text { kinetic energy }(K . E)=\frac{1}{2} \times 5511.55 \times 0.00049[/tex]

              [tex]kinetic energy (K . E)=1.358 joule[/tex]

Answer: electrical energy

Explanation:

Electrical energy

Answer:

42000N

Explanation:

F=mass *acceleration

F= 1200*35

F=42000N

Answer:

The amount of water vapor in the air is called absolute humidity. The amount of water vapor in the air as compared with the amount of water that the air could hold is called relative humidity. This amount of space in air that can hold water changes depending on the temperature and pressure.

The amount of water vapor in the air is represented by the term 'relative humidity'. This is the ratio of the current amount of water vapor to the maximum amount that the air could hold at that temperature, typically expressed as a percentage. The saturation point or the temperature at which the relative humidity becomes 100% is known as the 'dew point'.

The measure of the amount of water vapor in the air refers to the concept of relative humidity. This is the ratio of the current amount of water vapor in the air (vapor density) to the maximum amount the air can hold at that temperature (saturation vapor density).

Relative humidity is expressed as a percentage. For example, if the air contains 9.40 g/m³ of water vapor, we would look up the saturation density for the current temperature. Let's say at 10.0°C, the saturation density is 9.40 g/m³. This means the air is holding as much water vapor as it can at that temperature, so the relative humidity is 100%. This temperature is known as the dew point.

As another example, if the air temperature rises or falls, it can change the amount of water vapor the air can hold, and thus change the relative humidity. This is why relative humidity often changes over the course of a day as the air temperature changes.

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Answer: 4.74 mm

Explanation:

We can solve this problem with the following equation:

[tex]Y=\frac{stress}{strain}[/tex] (1)

Where:

[tex]Y=1.8(10)^{10} Pa[/tex] is the Young modulus for femur

[tex]stress=\frac{F}{A}=1.58(10)^{8} Pa[/tex] is the stress (force [tex]F[/tex] applied per unit of transversal area [tex]A[/tex]) on the femur

[tex]strain=\frac{\Delta l}{l_{o}}[/tex]

Being:

[tex]\Delta l[/tex] the compression the femur can withstand before breaking

[tex]l_{o}=0.54 m[/tex] is the length of the femur without compression

Writing the data in equation (1):

[tex]Y=\frac{\frac{F}{A}}{\frac{\Delta l}{l_{o}}}[/tex] (2)

[tex]1.8(10)^{10} Pa=\frac{1.58(10)^{8} Pa}{\frac{\Delta l}{0.54 m}}[/tex] (3)

Isolating [tex]\Delta l[/tex]:

[tex]\Delta l=\frac{(1.58(10)^{8} Pa)(0.54 m)}{1.8(10)^{10} Pa}[/tex] (4)

[tex]\Delta l=0.00474 m[/tex] (5) This is the compression in meters

Converting this result to millimeters:

[tex]\Delta l=0.00474 m \frac{1000 mm}{1 m}=4.74 mm[/tex]

Answer:it is c

Explanation:

the question answered itself.

reread the question

The subject of this question is Physics. Average speed is used to measure the speed of an object because it takes into account the variation over time.

The subject of this question is Physics. The question is discussing the concept of speed and how it is measured. It explains that average speed is used because the speed of an object may vary over time. Distances and time are important measurements for calculating speed, but average speed takes into account the variation over time. Therefore, the correct answer is option C: average speed is used, which is total distance divided by total time.

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Answer:

hunger or mutation

Explanation:

If food suddenly becomes more available, the population of an organism might increase (population boom), potentially face increased predation, and show altered genetic variation in future generations.

If food suddenly became more abundant for an organism, several potential outcomes could occur, largely dependent on the specific conditions of a species' environment.

Broadly, one would expect the organism's population to increase due to increased resources for growth and reproduction. This is called a population boom. This is because with more food available, more individuals can be sustained and reproductive success may be higher.

Furthermore, if a species is heavily preyed upon and suddenly has more food available, it may face increased predation; predators may not avoid eating this suddenly more abundant prey. However, these effects can also sometimes be offset by an increased individual health and reproductive success in the prey species, allowing its population to persist or even grow despite increased predation.

Lastly, a sudden increase in food can also change the genetic variation within the population. If food was scarce and suddenly becomes abundant, organisms that were historically well-adapted for survival in harsh conditions might not be as well-adapted to the new conditions. This could potentially increase genetic variation in the future generations.

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Answer:

T=2π[tex]\sqrt{l/g}[/tex]  (simple pendulum)

length of the string  and gravity mainly effect the pendulum period

Explanation:

The initial velocity of go-kart is 2.5 m/s.

Explanation:

Here, the uniform acceleration of go-kart is given as 0.5 m/s². Also the time required by it to stop is also given as 5 s. As acceleration is the measure of change in velocity per unit time.

In this case, the velocity should be changed from a value to zero to come to rest. So the initial velocity will be positive value and final velocity is zero.

As we know the values of acceleration, final velocity and time, the initial velocity can be easily determined as follows.

[tex]Acceleration = \frac{Final velocity -Initial velocity}{Time}[/tex]

Since, final velocity is zero, acceleration is 0.5 m/s² and time is 5 s, then,

        [tex]-0.5=\frac{-\text {Initial velocity}}{5}[/tex]

        Initial velocity = 0.5 × 5 = 2.5 m/s.

So the initial velocity of go-kart is 2.5 m/s.

Answer:

Due to the generation of carbon dioxide

Explanation:

Climate change occurs due to global warming generated by greenhouse gases. Carbon dioxide is the gas that does not leave or allow solar radiation from the sun to rise from the Earth's surface, increasing the average temperature of the planet.

Burning fossil fuels for energy generation such as coal is another source of carbon dioxide generation. The generation of energy should be directed towards the production of renewable energies, using sources such as solar and wind energy.

Answer:

A.) the car

Explanation:

hope this helped <3

Answer:

Explanation:

It's Newton's first law of motion, and object in motion continues to stay in motion unless acted upon by an unbalanced force. In this case, your body is the force that's moving on the bus. When you jump(the unbalanced force) your body is still used to being in motion, which makes you fall and not land on your feet.  

The given statement "When the net force of an object decreases, the object's acceleration decreases" is true about Newton's second law.

Answer: Option B

Explanation:

Newton’s second law of motion states that the object’s acceleration depends on two variable:

The equation can be given as below,

             Force = mass × acceleration

Hence, from the above, it is concluded that force is directly proportionate to mass and acceleration of the objects. So, when force increases both mass and acceleration increases. Similarly, if force decreases, both mass and acceleration get decreased. Therefore, the given statement in option B would be correct answer.

Answer:

Space

Explanation:

Hope this helped

Answer:

VOLUME AND MASS IF U ;LOOK AT THE OTHERGUIYS ANSWER IS SPACE WHICH IS CORRECT BUT MY ANSSIGNMENT DOES NOT HAVE THAT ANSWER SO ITS VOLUME AND MASS

Explanation:

Answer:

The crumpled paper hits the ground first due to air resistance. The crumpled paper has less surface area than the flat paper, therefore the crumpled paper hits first.

I hope this helped. If you could mark brainliest that would be greatly appreciated.

Answer:

Crumpled paper

Explanation:

because it has less surface area than flat paper and resistance force is not acting on it

They are two types of metamorphic rocks which differ on the basis of formation and appearance.

Explanation:

car 1 & car 2

Explanation:

Momentum is the product of mass and velocity.

Form a table as shown below

Car              Mass            velocity          Momentum

1                     5                   2.2                 5*2.2 = 11

2                    5.5                2.0                 5.5*2=11

3                     6                   1.35                6*1.35=8.1

4                     6.5                1.90               6.5*1.90=12.35

5                      7                   1.35                7.0*1.35=9.45

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The magnitude of momentum is the product of an object's mass and its velocity. When you calculate these for each car, Cars 1 and 2 are found to have the same momentum of 11 kg m/s.

The momentum of an object is calculated by multiplying its mass by its velocity. In this case, you can calculate the momentum for each car and then compare the results to find which have the same magnitude of momentum.

From this, we can see that Car 1 and Car 2 have the same magnitude of momentum (11 kg m/s).

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She can climb 0.92 m without losing weight.

Explanation:

Gravitational potential energy is the energy consisting of the product of mass, gravity and height.

1 cal = 4184 J

140 cal = 585760 J

Energy = 585760 J,  m = 65.0 kg = 65000 g,   Efficiency = 20 %

                                  GPE = mgh

where m represents the mass

           g represents the gravity,

           h represents the height.

                             585760 = 65000  9.8  h

                                        h = 0.92 m.

Answer:

-6, [tex]-5\frac{2}{5}[/tex], [tex]-4\frac{1}{5}[/tex]

Explanation:

The solution of answer is in the picture attached

Answer:

Correct answer: Kinetic energy of rotation, kinetic energy of translation and potential energy

Explanation:

Before it began to rotate it possessed potential energy. After being released from the rest it starts to roll on the roof and get kinetic energy of rotation, kinetic energy of translation along with potential energy.

God is with you!!!

Her resultant displacement is (45 Meters East.)

She originally walks 45 meters east, then she goes south 45 meters, then north 45 meters.  The south and north placements  just make her go back to where her previous placements were before them. Making her 45 meters east.