Answer:
Explanation:
Field lines are lines of forces around a bar magnet. The show the direction of force field in a magnet.
Usually, around a bar magnet, the field lines originates and spreads out from the north pole.
Then they converge and enter through the south pole.
Therefore, we can make our choice by inspecting the given diagram. If the lines enters through the pole, it is the south pole.
Where they originate or leave is the north pole.
In a magnet, the lines (forces) always enter through the south pole and leave through the north pole.
I hope that helps ya'll.
- sincerelynini
PLEASE MARK BRAINLIEST!SO MANY POINTS! WILL MARK BRAINIEST!!!! PLZ BE FASSTT!
Which point on the roller coaster's path represents the point where potential energy is at a maximum? *
Point A
Point B
Point C
Point D
Which point on the roller coaster's path represents the point where kinetic energy is at a maximum? *
Point A
Point B
Point C
Point D
BTW BOTH QUESTIONS ARE BASED ON THE PICTURE
Answer: Point A is the answer for the potential energy. Point D is the answer for the kinetic energy.
Explanation:
Answer:
point a and point d
Explanation:
A loudspeaker produces a musical sound by means of the oscillation of a diaphragm. On what does the loudness of produced sound depend ?
Answer:A loudspeaker produces a musical sound by means of the oscillation of a diaphragm. The loudness of sound produced depends upon Amplitude of vibration.
Explanation:
The loudness of a sound depends upon the amplitude of vibrations. A sound will be louder if the amplitude of vibration is greater but if it is smaller than sound will not be louder.
Now it is the vibration of a sound that determines it's amplitude. Amplitude signifies the maximum distance moved. It means the extent of vibration If is vibrations have more amplitude than sound will be louder but if the amplitude of vibrations is shorter than the sound will be softer.
The loudness of sound produced depend on the frequency of oscillation, the amplitude of oscillation, the kinetic energy of oscillation
Explanation:
Loudness of an instrument is proportional to its amplitude
The amplitude ,frequency of the sound wave will be a function of both the speed and the amplitude of the cone.( i.e. keep the amplitude constant and vary the kinetic energy of the oscillation of the speaker cone and the frequency will change. )
If you step slowly into a pool, the ripples you make are reasonably small, whereas if you take a running jump (i.e. high kinetic energy).
1 what is global climate change.
2 consequences and the way forward
Answer:
Global climate change is an average long-term changes over the entire Earth in temperature, weather etc.
Explanation:
Climate change is the variation in climate than an average situation. This may include the change in rainfall patterns or weather patterns.This change is due to various reasons and has been affecting across the globe.Global warming is the main effect of climate change. Due to global warming, the temperature of the earth is constantly increasing. Rising sea levels, shrinking mountain glaciers, variation in the season's timing, etc are the consequences of global climate change.Noe the time has come that everyone should be dead serious to this matter. We should lessen the use of toxic chemicals and burning fuels. The tiny contribution from every individual sums up as a great help to reduce the problem.
An electric appliance draws 1.5 amperes of current when it is connect
24-volt source. What is the resistance of this appliance? (5F)
F
0.063 ohm
G
11 ohm
H
16 ohm
54 ohm
Answer:16ohm
Explanation:
Potential difference(v)=24volts
Current(I)=1.5amperes
Resistance(r)=?
r=v/I
r=24/1.5
r=16ohms
Final answer:
To calculate the resistance of an electrical appliance using Ohm's Law, divide the voltage by the current. With a 24-volt source and a draw of 1.5 amperes, the appliance's resistance is 16 ohms.
Explanation:
To find the resistance of an electrical appliance, we can use Ohm's Law, which states that resistance equals voltage divided by current (R = V/I). Given that the appliance draws 1.5 amperes of current from a 24-volt source, we can calculate the resistance as follows:
R = V / I
R = 24 V / 1.5 A
R = 16 ohms
Therefore, the resistance of the appliance is 16 ohms.
Which is an example of gaining a static charge by conduction?
A)
Rubbing a balloon against your hair.
Light
2:00
Tools
Shuffling your shoes across a carpet.
o
Bringing a charged rod near an electroscope.
Touching your car on a cold day and getting a shock.
Answer:
shuffling shoes
Explanation:
a force does 30000 J of work along a distance of 9.5m. Find the applied force.
Answer: F=3158N
Explanation:
Work is the product of force applied and the distance the object moves along the force applied. Work is measured in joules and the equation is as follows
W = F x d
So that F = W/d
F = 30000 J / 9.5m
F = ~3158 N
Final answer:
The applied force can be found using the work equation. Given that 30000 J of work was done over 9.5 m, the force is approximately 3157.89 N.
Explanation:
To find the applied force, we can use the equation for work, which is Work (W) = Force (F) × Distance (d). We were given the work done as 30000 J (joules) and the distance as 9.5 m (meters). Re-arranging the equation to solve for Force gives us F = W / d.
Plugging in our known values, we get:
F = 30000 J / 9.5 m
F = 3157.89 N (rounded to 2 decimal places)
Therefore, the applied force is approximately 3157.89 N (newtons).
A weightlifter lifts a 13.0-kg barbel from the ground an moves it a distance of 1.3 meters. What is the work se does on the barbell?
The work done on the barbell is -165.62 Nm.
Explanation:
Work done on any object is the measure of force required to move that object from one position to another. So it is determined by the product of force acting on the object with the displacement of the object.
In the present problem, the displacement of the object on acting of force is given as 1.3 m. And the weight of the object which is a barbel is given as 13 kg. As the work is to lift the object from the ground, so the acceleration due to gravity will be acting on the object. In other words, the force applied on the object to lift it should be in opposite direction to the acting of acceleration due to gravity.
Thus, [tex]Force = - Mass * Acceleration due to gravity = - 13 * 9.8 =-127.4 N[/tex]
Now, the force is -127.4 N and the displacement is 1.3 m.
So, [tex]Work done = F*d[/tex]
[tex]Work done = -127.4* 1.3 = -165.62 Nm[/tex]
So, the work done on the barbell is -165.62 Nm.
The main reason for making the cover of a vacuum
flask airtight is to prevent heat loss by
A. conduction
B. evaporation
C. radiation
D. convection
Answer:
(A) conduction
Explanation:
parts of that are touching other parts and thus create heat!!!! dont lose that heat!
Answer:
The answer is convention.
A train travels a distance of 240km in 3 hours. Calculate the speed of the train
A- 80km/h
B- 720km/h
C- 80m/h
The heat transfer depicted in the image is MOST likely
Answer:
Convection transferExplanation:
There are three kinds of heat transfer: conduction, convection, and radiation.
Conduction is the heat transfer by direct contact of a hot object with a cold object. It is transmitted by the vibration of the particles and not by translation motion. That is not what it is shown: the clouds are not in direct contact with the ground.
Heat transfer by convection is result of the motion of the particles in fluis, like water or air: particles move from hotter regions where they have high kinetic energy to colder regions where the particles have lower kinetic energy. Since the hotter fluids have lower density than the colder fluids, there will be a continous movement of parciles and heat. That is what is shown in the figure with the arrows.
Radiation heat transfer mechanism always occur but is only important when the temperature of the hot object is really high, like in a fire, or in a resistance to red hot, or in the Sun. The heat is radiated by infrarred radiation. That is not what is shown in the figure.
What was happening to the can and the particples inside the can? (step by step in the vid attatched)
Experiment: Air Pressure Can Crush
Answer:
See the answer below.Explanation:
The picture shows a crushed can inside a bowl with iced water.
This experiment consists on pouring a small amount of water inside a can, heating the can directly on a kitchen burner, using a heat insulating clamp, and placing the can with the open end face down in a bowl with iced water.
What was happening to the can and the particles inside the can?The particles inside the can, when heated on the kitchen burner will expand, since the heat supplied increases the kinetic energy of the particles vigorously. Since the can is open, the pressure inside the can equals the pressure outside the can (the atmospheric pressure).
When the can is put face down in contact with the iced water, the air inside the can will cool down rapidly, causing the pressure (according to Boyle's law) to decrease quickly.
Now, there will be a huge difference between the atmospheric pressure and the pressure inside the can, which will generate a net force pointing radially toward the can strong enogh to crush the can.
What is the mass of an object that weighs 720 N on the surface of the earth?
Answer:73.47kg approximately
Explanation:
Weight(w)=720N
Acceleration due to gravity(g)=9.8m/s^2
Mass(m)=?
Mass=w/g
Mass=720/9.8
Mass=73.47kg approximately
To determine the mass of an object with a weight of 720 N, use the formula w = mg and divide the weight by Earth's gravitational acceleration, yielding a mass of 73.47 kilograms.
Explanation:To find the mass of an object that weighs 720 N on the surface of Earth, we can use the formula for weight, which is w = mg, where w is weight in newtons, m is mass in kilograms, and g is the acceleration due to gravity in meters per second squared (m/s²). On Earth, g = 9.80 m/s².
Starting with the weight equation:
Therefore, the mass of the object on Earth is 73.47 kilograms.
Along boundaries plates are brittle and the crust fractures (breaks and cracks) forming ___
Answer:
Along boundaries plates are brittle and the crust fractures (breaks and cracks) forming Faults
Explanation:
Brittle material are substances that looks hard but can be easily broken by strain. Brittle deformation leads to crack and fracture of the material involve. Brittle crust lacks elastic ability , elasticity in this rocks are almost absent.
Fractures and cracks in rocks form fault. Fault is a discontinuity in rocks with an appreciable displacement. Fault is a displacement in rocks relative to one part. Generally, Fault occur when brittle rock fracture or crack, the fractured rocks move relative to one another.
Differential stress can cause rocks to fracture. If that part of the crust lacks ductility the stress on the rock will cause a brittle deformation. The brittle deformation causes fracture(breaks and cracks) leading to structure like Faults and Joints.
A ____________ is a machine which contains a lever and a wedge that combine to make work easier.
A) knife
B) screw driver
C) pair of scissors
D) handicapped ramp
Answer:
D
Explanation:
You need to pull a special "lever" to let the handicapp ramp out and it uses a wedge to push itself out
C: pair of scissors
- this is because the blades on a pair of scissors would identify as the wedge
- and the grip part of the scissors would be the lever.
What is the approximate terminal velocity of a sky diver before the parachute opens
Answer:
The approximate terminal velocity of a sky diver before the parachute opens is 320 km/h.
Explanation:
The terminal velocity is the maximum magnitude of velocity that is attained by the diver when he or she falls in the air. The terminal velocity of the person diving in air before opening parachute is 320 km/h that means the velocity when the person is experiencing free fall is 320 km/h.During terminal velocity, we can represent mathematical equation as;Buoyancy force + drag force = Gravity
A student needs help completing an energy transfer diagram for a ceiling fan. Which BEST fills in the blanks labeled M and N to describe the transfer of energy
The M and N represents the electrical and kinetic energy, respectively.
Explanation:
As the law of conservation of energy states that energy can neither be created nor be destroyed, it can only be transferred from one form of energy to another. So in the case of ceiling fan, the electrical energy which is used to switch on the fan, is transferred as the kinetic energy of the blades of the fan for its working. Thus, the energy transfer diagram will show the transfer of electrical energy to kinetic energy.
So, the M and N in the energy transfer diagram will represent electrical and kinetic energy, respectively.
Answer: c) N= electrical energy and M= kinetic energy
Explanation:
The options are:
a) N= electrical and M= potential energy
b) N=light energy and M= electrical energy
c) N= electrical energy and M= kinetic energy
d) N= mechanical energy and M= electrical energy
In the ceiling fan we have:
We have that for a ceiling fan:
When we turn it on, we allow electrical current to flow into the fan system.
That electrical current is used to move the blades of the fan, in this way creating a wind current. As you may know, the energy of the movement is called kinetic energy.
So we have that the conversion here is Electrical energy into Kinetic energy, so the correct option is c.
One way to describe a wave crest is the amount of ___________ applied over an area.
A. force
B. mass
Answer: The answer is force
Explanation:
Which agents contribute to erosion? Check all that apply.
Answer:
Moving water
Ice and glaciers
humans and animals
Explanation:
Erosion is the removal of weathered materials from the surface of earth. It is one of the processes that sculpts the surface of the earth due to its unique earth moving capabilities.
Moving water is one of the most important agent that leads to erosion. As water moves, it carries materials in different form. It can be as bed load for sediments of large sizes, suspended load for medium and fine grains and as solution for solvable materials. Ice and glaciers are prominent agent of erosion in polar and temperate regions. Glacier carries weathered materials by trapping them. Humans and animals through their activities contributes significantly to erosion too.The main agents that contribute to erosion include water, wind, ice(glaciers), and gravity. They each shape the earth's landscape in distinct ways such as through water erosion, wind erosion, glacial erosion, and erosion caused by gravity.
Explanation:There are several agents that significantly contribute to erosion, a common geologic process. The main agents of erosion include water, wind, ice(glaciers), and gravity. Water erosion occurs when moving water such as rain, rivers, or ocean waves wear down the earth's surface. Wind erosion happens especially in dry, bare areas where loose soil can be easily picked up by the wind. A glacier's movement can erode the land through a process called glacial erosion. Lastly, gravity contributes to erosion through landslides and rockfalls, where rocks and soil are pulled down by gravity. Each of these agents shape the earth's landscape in different ways.
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A charge of 8.5 × 10–6 C is in an electric field that has a strength of 3.2 × 105 N/C. What is the electric force acting on the charge?
2.72 N
Explanation:
Step 1:
From the basic formula in electrostatics
F = E * q
where F = Force due to charges
E = Electric field strength
q = Charge
Step 2:
From the given question
q= [tex]8.5*10^{-6} C[/tex]
E = [tex]3.2 * 10^{5} N/C[/tex]
F = [tex]8.5 * 10^{-6} * 3.2 * 10^{5} = 2.72[/tex] N
Answer:
B
Explanation:
E2020
You want to practice running 50 m sprints for an upcoming race. However,
you are practicing on a football field with distances marked in yards. How
many yards are equivalent to 50 m? (1 m = 1.0936 yd)
O A. 46 yd
O B. 80 yd
O c. 55 yd
O D. 49 yd
from fastest to slowest, rank the speeds of the ball 1 second after being thrown.
ball A) weight of 1.8kg, travels at 7 m/s
ball B) weight of 0.1kg, travels at 11 m/s
ball C) weight of 3.1kg, travels at 4 m/s
Answer:the awnser is c
Explanation:
Awnser
Answer:
C
Explanation:
Where would you find the least dense water? at 1,000 m in the Antarctic Ocean ,at 200 m in the Arctic Ocean, at the surface of the Atlantic Ocean, below 1,000 m in the Pacific Ocean
Answer:
At the surface of the Atlantic Ocean
Explanation:
The atlantic ocean is a worm ocean and the surface has the least dense water. This is because the denser layer of water sinks, while the least dense floats.
The Atlantic Ocean stands out in the choices with warmer temperatures at depths. This results from the different flow dynamics in the semi-enclosed Mediterranean Sea.
A disk initially rotated counterclockwise at 1.0 rad/s, but has a counterclockwise angular acceleration of 0.50 rad/s^2 for 2 seconds. After this acceleration, the disk is at an angle of 6.0 rad.
What is the disk’s angular position when the acceleration started?
Answer:
Initial angular position of the disc is 3 radian
Explanation:
As we know that the angular acceleration of the disc is given as
[tex]\alpha = 0.50 rad/s^2[/tex]
initial angular speed is given as
[tex]\omega = 1 rad/s[/tex]
now we know that angular displacement of the disc is given as
[tex]\theta = \omega t + \frac{1}{2}\alpha t^2[/tex]
[tex]\theta = 1(2) + \frac{1}{2}(0.5)(2^2)[/tex]
[tex]\theta = 3 rad[/tex]
now we have
[tex]\theta_f - \theta_i = 3 rad[/tex]
[tex]6 rad - \theta_i = 3[/tex]
[tex]\theta_i = 3 ard[/tex]
Final answer:
To find the initial angular position of the disk, we used the kinematic equation for rotational motion and the given values (angular acceleration, initial angular velocity, and final angle) to calculate that the disk's angular position when the acceleration started was 3.0 rad.
Explanation:
The problem is asking us to find the angular position of the disk when it started accelerating. Since we know the angular acceleration, the initial angular velocity, and the final angular position, we can use the kinematic equations for rotational motion to determine the initial angular position.
The kinematic equation we'll use is:
[tex]\( \theta = \theta_0 + \omega_0t + \frac{1}{2}at^2 \)[/tex],
where [tex]\(\theta\)[/tex] is the final angular position,[tex]\(\theta_0\)[/tex] is the initial angular position, [tex]\(\omega_0\)[/tex] is the initial angular velocity, [tex]\(a\)[/tex] is the angular acceleration, and [tex]\(t\)[/tex] is the time.
Given:
[tex]\(\theta = 6.0 \text{ rad} \)[/tex] (final angular position),
[tex]\(\omega_0 = 1.0 \text{ rad/s} \)[/tex] (initial angular velocity),
[tex]\(a = 0.50 \text{ rad/s}^2 \)[/tex] (angular acceleration), and
[tex]\(t = 2 \text{ s} \)[/tex] (time).
We rearrange the equation to solve for [tex]\(\theta_0\)[/tex]:
[tex]\(\theta_0 = \theta - \omega_0t - \frac{1}{2}at^2 \)[/tex]
Plugging in the values:
[tex]\(\theta_0 = 6.0 \text{ rad} - (1.0 \text{ rad/s} \cdot 2 \text{ s}) - \frac{1}{2} \cdot 0.50 \text{ rad/s}^2 \cdot (2 \text{ s})^2 \)[/tex]
[tex]\(\theta_0 = 6.0 \text{ rad} - 2.0 \text{ rad} - 0.50 \cdot 2 \text{ rad} \)[/tex]
[tex]\(\theta_0 = 6.0 \text{ rad} - 2.0 \text{ rad} - 1.0 \text{ rad} \)[/tex]
[tex]\(\theta_0 = 3.0 \text{ rad} \)[/tex]
So the disk's angular position when the acceleration started was 3.0 rad.
A light bulb is supplied with 100 J of energy each
second.
a How many joules of energy leave the bulb
each second in the form of heat and light?
b If 10 J of energy leave the lamp each second
in the form of light, how many joules leave
each second in the form of heat?
Answer:
a.95J
b.90J
Explanation:
a.Applying energy conservation laws:-
Energy Into Bulb=[tex]Light \ Energy+Thermal \ Energy(Heat \ Energy)[/tex]
Given that light energy=5J,and Total Energy=100J
[tex]Heat \ Energy= \Total \ Energy- Light \ Energy\\=100J-5J=95J[/tex]
b. Applying the laws in a above.
Total Energy=100J
Light Energy=10J
[tex]Heat \ Energy=100J-10J=90J[/tex]
The amount of property that is needed by a body or an object to work is called energy. It is conserved and can only be transferred from one object to another. It is estimated in Joules, calories or kW -h.
The energy that leaves the lamp is a. 95 J and b. 90J.
This can be estimated as:
a. According to the conservational law of energy:
[tex]\rm Energy \;in \;the\; bulb = Light \;Energy + Heat\; Energy[/tex]
Given,
Light Energy = 5 JTotal Energy = 100 JSubstituting values in the equation:
[tex]\begin{aligned}\text{ Heat Energy} &= \text{Total Energy - Light Energy} \\&= 100 - 5 \\&= 95 \text{J} \end{aligned}[/tex]
b. Applying the same law:
Given,
Total energy = 100 JLight energy = 10 JSubstituting values:
[tex]\begin{aligned} \text{Heat Energy } & = 100 - 10 \\& = 90 \text{J} \end {aligned}[/tex]
Therefore, energies released are a. 95 J and b. 90J.
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Which amendment deals with state rights
Answer:
The Tenth Amendment
Explanation:
It supports states rights. it is apart of the "bill of rights". it expresses the federalism and state rights. It explains the the United states of Government is made this amendments to protect do the state rights. What people want.
Which most likely could cause acceleration?
Select four options.
A. a flat road
B. wind
C. water movement
D. a hill
E. a stop light
Answer:
A few examples of acceleration are the falling of an apple, the moon orbiting around the earth, or when a car is stopped at the traffic lights. Through these examples, we can understand that when there is a change in the direction of a moving object or an increase or decrease in speed, acceleration occurs. Acceleration (a) is the change in velocity (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt. This allows you to measure how fast velocity changes in meters per second squared (m/s^2). Acceleration is also a vector quantity, so it includes both magnitude and direction.
Explanation:
Acceleration can be caused by a hill, wind, water movement, and a stop light.
Explanation:The options that would most likely cause acceleration are a hill, wind, water movement, and a stop light.
A hill causes acceleration when an object rolls down due to the force of gravity. Wind can cause acceleration if it pushes an object. Water movement can cause acceleration if it exerts a force on an object. Finally, a stop light can cause acceleration when a car goes from a stationary position to moving quickly when the light turns green.
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All the mass we ever encounter is positive - nothing weighs less than zero. What makes us think charge is different that there are both positive AND negative charges?
Answer:
Mass is considered as positive as it is the amount of matter and as nothing weighs less than zero. But the concept of charge in electricity can be both positive and negative because of the behaviour Observed in electrical phenomena , Conservation of charge , Interaction of charged objects and Atomic and subatomic structure
Explanation:
Understanding the nature of mass and its positivity
Mass is the amount of matter in an object. As the amount of matter cannot be less than zero. It is always greater than or equal to zero.
Exploring the concept of electric charge
Incase of electric charge it acts differently as per the system it belongs to, The following are some observation which substantiate the presence of negativity and positivity of electric charge.
a) Observations of electrical phenomena: People have observed electrical effects, such as static electricity, where objects can be attracted or repelled without physical contact. This led to the idea that there are two types of charges involved.
b) Conservation of charge: Scientists observed that charge is conserved in interactions. For example, during various experiments involving the charging and discharging of objects, the total amount of charge in a closed system remained constant. This observation supports the idea of positive and negative charges.
c) Behavior of charged objects: Through experiments, scientists found that like charges repel each other, while opposite charges attract. This behavior is consistent with the existence of positive and negative charges.
d) Atomic and subatomic structure: Detailed studies of atoms revealed that they consist of positively charged protons, negatively charged electrons, and neutral neutrons. The balance between protons and electrons determines the overall charge of an object.
Hence the mass never considered as negative and we think differently for electric charge
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In a building with 10.000 cubic feet where the air changes every two hours, what the rate of air change? A. 167.7 cfm B. 83.3 cfm C. 133.3 cfm D. 50 cfm
Answer:
Flow rate of air is given as 83.33 cubic feet per minute
Explanation:
As we know that total volume of the air flow is given as
[tex]V = 10,000 cubic feet[/tex]
also we know that total time is
[tex]t = 2 hours = 120 min[/tex]
now we have flow rate given as
[tex]Q = \frac{V}{t}[/tex]
[tex]Q = \frac{10000}{120}[/tex]
[tex]Q = 83.3 cf/m[/tex]
Bumper car A(281 kg) * m * c moving +2.82 m/s makes an elastic collision with bumper car B (209 kg) * m * c moving - 1.72 m/s . What is the velocity of car A after the collision ?
The final velocity of the car A after collision is 1.884 m/s.
Explanation:
As per law of conservation of energy, the momentum of objects before collision is tend to be same for the momentum of objects after collision, in case of elastic collision.
So, from those equation, we can derive the final velocities for both the objects after collision.
[tex]v_{1} = \frac{m_{1}- m_{2} }{m_{1} + m_{2} } u_{1}+ \frac{ 2*m_{2} }{m_{1} + m_{2} } u_{2}[/tex]
[tex]v_{2} = \frac{2*m_{1} }{m_{1} + m_{2} } u_{1}+ \frac{ m_{2}- m_{1} }{m_{1} + m_{2} } u_{2}[/tex]
So if we consider the car A is having a mass m1 which is equal to 281 mc kg with initial velocity before collision as u1 = 2.82 m/s. And then the car B will be having the mass m2 equal to 209 mc kg with the velocity of 1.72 m/s. So if the final velocity of car A after collision is required to determine then we have to solve the formula for v1
[tex]v_{1} = \frac{m_{1}- m_{2} }{m_{1} + m_{2} } u_{1}+ \frac{ 2*m_{2} }{m_{1} + m_{2} } u_{2}[/tex]
[tex]v_{1} = \frac{281- 209 }{281 + 209} } * 2.82+ \frac{ 2*209 }{281+209}*1.72[/tex]
[tex]v_{1} = \frac{72 }{490} } * 2.82+ \frac{ 418 }{490}*1.72[/tex]
[tex]v_{1} = 0.414+1.47=1.884[/tex]
So the final velocity of the car A after collision is 1.884 m/s.
Pleaseeeeee helpppp meeeeeeee please don't skippp I am struggling baddd
Answer:
magnetic force: compass, door catch, speaker, armatureelectric force: air filter, socksExplanation:
You are expected to have some understanding of how these devices work. It is helpful to actually see one or take it apart.
Magnetic force is involved where there is a magnet or material that responds to a magnet.
Of course a compass aligns itself with the magnetic field of the earth.
A magnetic door catch uses a magnet or pair of magnets to attract a metal plate, holding the door closed.
A speaker uses the reaction between the magnetic field in a coil of wire and that of a fixed magnet to move the speaker cone. (There are versions of speakers that use electrostatic force (electric field), but those are less common.)
A motor moves by creating a magnetic field in the armature that reacts with one in the stator. The latter can be created by fixed magnets, or by an electric current.
__
Electric force is involved when the operation is a result of the attraction between oppositely charged particles.
An electronic air filter uses the attraction of charged particles to attract "dirt" in the air to a charged surface, so removing it from the air.
Socks from the dryer often cling to each other (static cling) because the charge they get from rubbing other dryer contents is not dissipated in the dry air. (Fabric softener can reduce this effect, presumably by making the materials more electrically conductive.)