Which is an important step in how an electric motor uses magnetic force to produce motion?
A) As the north pole of the electromagnet nears the north pole of the permanent magnet, the current reverses and the poles of the magnets then attract.
B) As the north pole of the electromagnet nears the south pole of the permanent magnet, the current reverses and the poles of the magnets then repel.
C) As the north pole of the electromagnet nears the north pole of the permanent magnet, the current reverses and the poles of the magnets then repel.
D) As the north pole of the electromagnet nears the south pole of the permanent magnet, the current reverses and the poles of the magnets then attract.

Answer:

The correct answer is: B area = area

Explanation: You can solve this problem through the use of laws of Kepler's planetary motion. There are Kepler the laws ( 3 of them) In this exercise, we will use the second law. According to this law, a line segment joining a planet and the sun sweeps out areas is equal to that during the equal intervals of time

The following diagram shows the path of a planet around the Sun. Kepler discovered that area A = area B. Option A is correct.

During equal intervals of time, a line segment between a planet and the sun sweeps out regions are equal. Equal regions for equal times is Kepler's Law.

The journey of a planet around the Sun is depicted in the diagram below. Area A = area B was found by Kepler.

The regions swept away by a planet as it advances in an orbit around the Sun are equal for equal time periods. A: The equal portions of circular orbits are identical in form and size.

To learn more about the Kepler's Law refer:

https://brainly.com/question/1608361

#SPJ2

Answer:

60 W

Explanation:

The work done in lifting the object is given by:

[tex]W=Fd[/tex]

where

F = 30.0 N is the weight of the object

d = 10.0 m is the displacement covered by the object

Using the formula,

[tex]W=(30.0 N)(10.0 m)=300 J[/tex]

Now we can calculate the power, which is given by

[tex]P=\frac{W}{t}[/tex]

where

W = 300 J is the work done

t = 5.00 s is the time interval

Substituting,

[tex]P=\frac{300 J}{5 s}=60 W[/tex]

The power required to lift a 30.0 N weight to a height of 10.0 m in 5.00 s is calculated using the Power = Work / Time equation. The work, measured in Joules, is determined by multiplying the force (in Newtons) by the distance (in meters). This results in an output of 60.0 Watts.

In the field of Physics, the concept of power is defined as the rate of doing work or the amount of energy transferred per unit time. In this situation, we can compute the power required to lift a 30.0 N object to a height of 10.0 m in 5.00 s using the equation: Power = Work / Time. Let us calculate:

First, we find the work done: Work = Force x Distance, so Work = 30.0 N x 10.0 m = 300.0 Joules.

Next, we calculate the power: Power = Work / Time = 300.0 Joules / 5.00 s = 60.0 Watts.

Therefore, it would take approximately 60.0 Watts of power to lift a 30.0 N object to the height of 10.0 m in 5.00 s.

https://brainly.com/question/31734672

#SPJ3

Any object that's moving has kinetic energy.

Its kinetic energy is (1/2)·(its mass)·(its speed squared) Joules.

Naoki's mass is calculated to be 54 kg by using Newton's second law of motion and subtracting the bicycle's mass from the total mass obtained when the force and acceleration are considered.

To determine Naoki's mass given that her bicycle has a mass of 11 kg and she accelerates it with a force of 110.5 N at an acceleration of 1.7 m/s², we can use Newton's second law of motion, which states that force equals mass times acceleration (F = m * a). Here, the total mass includes both Naoki's mass and the bicycle's mass.

First, we calculate the total mass by rearranging the equation to m = F / a. Substituting in the known values, we get m = 110.5 N / 1.7 m/s², which gives us a total mass of 65 kg. Since we know the bicycle's mass is 11 kg, we subtract this from the total mass to find Naoki's mass: 65 kg - 11 kg = 54 kg. Therefore, Naoki's mass is 54 kg.

Answer:

[tex]-6.25\cdot 10^7 J[/tex]

Explanation:

The gravitational potential at a point on the Earth surface is given by:

[tex]U=-\frac{GM}{R^2}[/tex]

where

G=6.67×10^-11Nm^2kg^-2 is the gravitational constant

M=5.98×10^24kg is the Earth's mass

R=6.38×10^6 m is the Earth's radius

Substituting the numbers into the equation, we find

[tex]U=-\frac{(6.67\cdot 10^{-11})(5.98\cdot 10^{24})}{(6.38\cdot 10^6)}=-6.25\cdot 10^7 J[/tex]

It must be a virtual image, because this is the only kind of image it can produce.

Answer: 800 N

Explanation:

Force is change of momentum (p) over change in time: F = ma = dp/dt

change in time dt= 0.10 s

mass = 2 kg

initial velocity v0=20 m/s

final velocity vf= -20 m/s

change in momentum dp= m(vf-v0)

dp=2(-20-20)= -80 N/s

F=dp/dt=-80/.10=-800 N

Since they only want the magnitude, you can drop the negative sign so the answer is just 800 N.

Final answer:

The magnitude of the average force exerted by the bat can be found using the impulse-momentum principle. The impulse experienced by the ball is equal to the change in momentum. The impulse is also equal to the average force multiplied by the contact time.

Explanation:

The magnitude of the average force exerted by the bat can be found using the impulse-momentum principle. The impulse experienced by the ball is equal to the change in momentum. Since the ball is initially moving along the -x direction and ends up moving along the +x direction with the same speed, the change in momentum is equal to 2 times the initial momentum. Therefore, the impulse is 2 times the initial momentum.

The impulse is also equal to the average force multiplied by the contact time. So, we can set up the equation: 2 times the initial momentum is equal to the average force multiplied by 0.10 seconds.

Solving this equation will give us the magnitude of the average force exerted by the bat.

All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons.

Answer:

110 kg

Explanation:

The momentum of the Malcom+motorcycle system is given by:

[tex]p=(m+M)v[/tex]

where

(m+M) is the total mass of the system, with

m = mass of Malcom

M = 190 kg (mass of the motorcycle)

v = 20 m/s velocity

Since we know the momentum:

p = 6000 kg m/s

We can re-arrange the equation to find the mass of Malcom:

[tex]m=\frac{p}{v}-M=\frac{6000 kg m/s}{20 m/s}-190 kg=110 kg[/tex]

Answer:

D. 214 kPa

Explanation:

The absolute pressure is given by:

[tex]p = p_a + p_g[/tex]

where

p is the absolute pressure

[tex]p_a \sim 100 kPa[/tex] is the atmospheric pressure

[tex]p_g[/tex] is the gauge pressure

In this problem, we have

[tex]p_g = 114 kPa[/tex]

So, the atmospheric pressure is

[tex]p = 100 kPa + 114 kPa = 214 kPa[/tex]

Answer:

your answer is 214kPa

Explanation:

Final answer:

Group 18 noble gases, including helium, neon, and argon, are inert due to their full outermost energy levels, making them chemically stable and minimally reactive under normal conditions.

Explanation:

Group 18 noble gases are inert because d. their outermost energy level is full.

The noble gases, such as helium, neon, and argon, possess filled outer electron shells, making them extremely stable. This configuration, often known as a filled valence shell or octet, imparts a large ionization energy to these elements, making them reluctant to lose an electron. In the event that they do accept an additional electron, it would occupy a much higher energy level, rendering it loosely bound and thus energetically unfavorable. The inherent stability of their electron configurations means that noble gases are chemically inert, demonstrating minimal reactivity under normal conditions. Under extreme conditions, such as high pressure and temperature, they can be coerced into forming chemical compounds, though this is not typical of their standard chemical behavior.

Answer:

1. A series circuit is a closed circuit which has all loads connected in a row and there is only one path for the current to flow.

2. The Ohm's Law state that a current flow through a resistor is directly proportional to the voltage across it [tex]R = \frac{V}{I}[/tex]

3. A parallel circuit is a closed circuit divided into branches that it has two o more paths for the current to flow and the loads are parallel to each other which mean the voltage across them is the same for all loads.

1.  In an series circuit, all parts are connected one after another along one path.  

2.  Ohm's Law says that resistance is equal to the voltage divided by the current.  

3.  In an parallel circuit, the different parts of the circuit are on separate branches.

Answer:In a series circuit, adding more resistors increases total resistance and thus lowers current. But the opposite is true in a parallel circuit because adding more resistors in parallel creates more choices and lowers total resistance. If the same battery is connected to the resistors, current will increase.

Explanation:

Answer:

The correct option is "It will increase the equivalent resistance which will decrease the total current".

Explanation:Increasing resistance will always decrease total current as as resistance implies "resisting the current flow"

Answer:

[tex]0.0089 W/m^2[/tex]

Explanation:

The intensity of a sound wave is given by

[tex]I=\frac{P}{A}[/tex]

where

P is the power of the wave at the source

A is the area over which the sound wave propagates

In this problem, we have

P = 70.0 W is the power

We want to know the intensity at a distance of r = 25.0 m from the orchestra, so since the sound waves propagates radially, we must consider a spherical surface of radius r, so the area is

[tex]A=4\pi r^2 = 4\pi (25.0 m)^2=7850 m^2[/tex]

Therefore, the intensity of the wave is

[tex]I=\frac{70 W}{7850 m^2}=0.0089 W/m^2[/tex]

Answer:

6 climate regions are Mediterranean, Polar, Tropical, Temperate, Arid and Tundra.

Explanation:

There are six main climate regions in the world. These regions distinguished from one another on the basis of climate that exists there. Above mentioned climates are described shortly as follows:

Mediterranean: This region is the region surrounding the Mediterranean sea, Southern California and Southern America. The climate in this region is hot and dry in summer whereas mild winters are there in this region.

Polar: This region is on the South Pole, near the side of Greenland. The climate in this region is very cold and chilled.

Tropical: This region consists of jungles of South America, Africa, some parts of Asia and the islands of Pacific. The climate of this region is Hot. Due to heavy rainfalls in this area, the area is also wet.

Temperate: North America, Europe and Northern Asia is included in this region. The climate is mild hot in summers and cold in winters.

Arid: This region consists of deserts of Africa, Asia, US and Australia. The climate is very hot throughout the year.

Tundra: This region consists of the mountain tops of America, Asia and Greenland. The climate is extremely cold in such regions throughout the year.

In the Gregorian calendar (the calendar used in most Western countries), the year begins on January 1st and ends on December 31st, lasting 365 days.

However, the Solar year (the time it takes for the Earth to make its orbit around the sun) lasts a little bit longer: 365 days 5 h 48 min 45.10 s (365.242189 days).

This means there is a gap between the Gregorian calendar and the Solar year. So, the solution given to this situation was to correct the calendar every four years by an unaccounted accumulation of approximately 1/4 of a day per year that equals one extra day, as follows:

"Leap year is divisible by 4, unless it is a secular year (last of each century, ending in 00), in which case it must also be divisible by 400."

This extra day is added in February, after day 28th. That is why every four years we have a February 29th in the Gregorian calendars or a Leap year.

Answer:

Leap years make up for the extra one-fourth day the Earth needs to orbit the sun

Explanation:

Answer:

170 N

Explanation:

Given in the question that, work a bulldozer can do = 4500 J

We will use trigonometry identity to find the distance bulldozer will travel up the hill

sin(35) = opp/hypo

sin(35) = 15/hypo

hypo = 15/sin(35)

hypo = 26.15m

Formula to use

work done = force × distance

Plug values in the above formula

4500 = force x 26.15

force = 4500/26.15

force = 172.08

force ≈ 170 N

Answer:

520 N

Explanation:

Answer:

I just answered a question like this. It should be B. An electromagnet :)

Explanation:

Answer:the answer is a MOTOR!

Explanation: I JUST TOOK THE K12 QUIZ

everyone on brainly is wrong! the answer is MOTOR

Position 4

At position 4 the diver has the least amount of height, which is what GPE is proportional to.

Hope this helped!

Answer:

Given:

Th = 270 °C = 270+273 = 543 K, hot temperature

Tc = 210 °C = 210+273 = 363 K, cold temperature

According to the Carnot theorem, the maximum efficiency achievable by a heat engine between a hot and cold temperature is

η = 1 - Tc/Th

  = 1 - 363/543

  = 0.668 = 11.047 (approx)

Answer:  11.0%  (nearest integer)

Answer:

Hello! the efficiency of a thermal engine depends on how much of the initial input is transformed into work, Here 270°c is the input and 210°c is the output.

Then the efficiency is calculated as e = 1 - Tc/Th, where Th is the hot temperature (in this case 270°C) and Tc is the cold temperature (in this case 210°C)

First we need to write the temperatures in kelvin degrees, this can be done by adding 273.15 to the celsius scale:

Th = 270 + 273.15 = 543.15

Tc = 210 +273.15 = 483.15

then the efficiency is e = 1 - 543.15/483.15 = 0.11

if we write this as a percentage, we get an efficiency of 11%, then the fourth answer is the correct one.

Answer:

True.

Explanation:

The formation of fossils is associated with a series of biological and geological events beginning with the death of an organism. This is followed by a series of events, such as necrolysis, disarticulation, transport and burial of the remains, until the final occurrence of the physicochemical processes that transform sediments into rock and fossilize the organisms deposited therein. The area of paleontology that deals with unraveling all the processes mentioned above is taphonomy. With that we can say yes, Taphonomy is the study of what happens to animals or humans between the time they die and the time their remains are found.

Earth's surface temperature has warmed 1.5 degrees Celsius over the past 250 years and "humans are almost entirely the cause," concludes a scientific study designed to address skeptical concerns that the causes of climate change are even induced. for the man. Professor Richard Muller, a climate change physicist and founder of the Berkeley Earth Surface Temperature Project, said he was surprised by the findings. "We did not expect this result, but as scientists it is our duty to let the evidence change our minds." He added that he now considers himself a "converted skeptic" and his views have been subjected to a "total turnaround" in a short time. "Our results show that the average land surface temperature has increased by 1.5 degrees Celsius over the last 250 years, including an increase of 0.9 degrees Celsius over the last 50 years. In addition, it seems likely that essentially all of this increase results from human emissions of greenhouse gases, ”Muller wrote in an article in the New York Times. The University of California, Berkeley-based team of scientists has assembled and consolidated a set of 14.4 million surface temperature observations, collected from 44,455 sites worldwide, dating back to 1753. Previous datasets created by NASA and the National Oceanic and Atmospheric Administration (NOAA) in the US, and by the Met Office and the Department of Climate Research at the University of East Anglia in the United Kingdom only arrived until the mid-19th century and used only a fifth of the number. of weather station records

She will need pulleys. Nothing else will work

Answer:

mass of the planet and its distance from other objects

Explanation:

mass of the planet and its distance from other objects determine the strength of its gravitational force on other objects

The characteristics of a planet determine the strength of its gravitational force on other objects are:  mass of the planet and its distance from other objects . Hence, option (B) is correct.

Gravity is a fundamental interaction in physics that causes all objects with mass or energy to attract one another. Gravity is by far the least powerful of the four fundamental interactions.

However, gravity is the most important interaction between things and governs the motion of planets, stars, galaxies, and even light.

Gravitational field strength of the planet can be expressed as:

E = GM/r²

Where G = universal gravitational constant and M = mass of the planet; r = distance between the planet and the object.

Hence, the characteristics of a planet determine the strength of its gravitational force on other objects are:  mass of the planet and its distance from other objects .

Learn more about gravity here:

https://brainly.com/question/4014727

#SPJ6

Microtechnology i hope this will help

Answer: Second option is correct.

Explanation:

An engineer is working on a new kind of wire product that is about the size of a bacterium cell, this kind of technology is known as "Micro technology".

It deals with features near one micrometer.

It is used to create structure having functional feature with at least one dimension.

Hence, Second option is correct.

Answer:

A. ) alloys

B. ) main

Explanation:

Brass and bronze are both alloys(A) of copper because copper is the main(B) component in brass and bronze.

Explanation:

Brass and Bronze are used in our day to day life known as metal alloys.  Brass is an alloy of the metals like copper and zinc which has high percentage of metal copper with tin combined with it.  

Brass is dull yellow in color. Bronze is reddish brown in color. Brass was known to be present in 500 BC. Bronze was about 3500 BC known to be present.  Thus Bronze and Brass are both alloys of the metal copper since the main component in the brass and bronze is copper.

Answer:  Producers have the greatest amount of available energy.

When an organism eats another organism, it gains energy.

Explanation:

A food chain is a linear sequence of transfer of food and energy when one organism is eaten by the other organism. A food web is the interconnection of two or more food chains. This happens when one organism belong to one food chain also consume organisms of same food chain or other food chain. A food chain includes trophic levels on the basis of the mode of feeding of the living beings.

Among the options given, Producers have the greatest amount of available energy. and

When an organism eats another organism, it gains energy. are correct.

Producers are the organism which are capable of producing their food either through photosynthesis or chemosynthesis. They are present at the base level of the food chain. They consist of large amount of energy as compared to all the trophic levels in the food chain.

When one organism eats other organism it gains energy because of the assimilation and digestion of the organism as food.

Answer:

C. conductor and battery

Explanation:

An electrical circuit is the part in which two or more conductors are joined in series , parallel or in mixed grouping such that when they are connected to a battery then some current will flow through it.

So here we can say that in order to make a complete circuit we need to take care that current will flow through the combination which will make a circuit

In order to flow the current we need an energy source which is done by the battery and other is the conductor which help to flow the the charge particles.

So here correct answer will be

C. conductor and battery

Answer:

A conductor and a battery

Explanation:

Answer:

Electrons

Explanation

Only charged particles like protons and electrons can create an electric field. Around every proton and electron there is an electric field. Since electric field is proportional to the magnitude of charge, large number of charges will produce a large field.

The large imbalance electron would create a significant electric field

Note: imbalance of electrons would mean that, there are more ( or less) number of electrons present than there are protons

Final answer:

The weapon used by the Jawa creates an electric field through an imbalance of electrons. In an atomic nucleus, protons stay together thanks to the strong nuclear force, which is much stronger than the electromagnetic repulsion between positively charged protons.

Explanation:

The weapon used by the Jawa surrounds R2-D2 with a strong electric field, which is created by a large imbalance of electrons. An electric field is produced when there is an excess or deficit of electrons, which are negatively charged particles. This imbalance generates a force, pushing on other electric charges within the field, and this is what captures R2-D2 in the Star Wars universe.

An atomic nucleus is able to stay intact, not flying apart despite the repulsion between positively charged protons, because of the strong nuclear force. This force is significantly stronger than the electromagnetic force and is responsible for holding the protons and neutrons together in the nucleus of an atom. On the other hand, the weak nuclear force is much weaker and has only a marginal effect in offsetting the electric force between protons.

Answer:

He was able to prove that matter and energy are inter-convertible, and mass may be used to measure the total energy present in an object.

Explanation:

He observed a mass defect in nuclear reaction products and the reactants. Thus, mass may be used to measure the total energy present in an object by the use of the equation;

                 E = m × [tex]c^{2}[/tex]

Where: E is the energy, m is the mass and c is the constant speed of light.

He developed the use of nuclear reactions to generate heat energy, which has a great applications in atomic bombs.