Answer:
Some of the differences between a gravitational force and a magnetic force are:
Gravitational force is a type of attractive force that exists between two objects with mass, while magnetic force is a type of force that exists between two objects with a magnetic field.Gravitational force is always attractive, meaning that it pulls two objects towards each other, while magnetic force can be attractive or repulsive, depending on the direction of the magnetic fields.Gravitational force is proportional to the mass of the objects, while magnetic force is proportional to the magnitude of the magnetic field.Gravitational force is weaker than magnetic force, as it decreases with distance more quickly.Gravitational force is affected by the distance between the objects, while magnetic force is affected by the angle between the magnetic fields.Overall, gravitational force and magnetic force are two different types of forces that have different properties and behave differently in different situations.
2c. Explain why the diversity changes in the different successional stages.
[2 marks]
Increased availability of nutrients due to changes in soil composition leads to the emergence of new leaves, which boosts diversity.
How does biodiversity change through the stages of ecological succession?The variety of species found in an ecosystem is known as its biodiversity. The evolution of organisms following a catastrophe that wipes out an environment is known as ecological succession. Ecological succession boosts biodiversity by expanding the variety of species that exist in a region.
Site characteristics, the kind of events that start succession, interactions between the species present, and more stochastic elements, such the availability of propagules or the weather at the time of disturbance, can all have an impact on the course of successional change.
Ecological succession is the process by which a region's species and habitat mix changes over time. Until a "climax community," such as a mature forest, is reached or until a disruption, such as a fire, occurs, these communities gradually replace one another.
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object's velocity will not change unless it is acted on by a(n)
O net force.
O strong force.
O unbalanced force.
O opposite but equal force
A car is moving at 30.0 m/s, east in a straight line approaching the red traffic light as shown. The
time it takes for the car to stop is .6 seconds.
What is the acceleration of the car?
Answer:
–5
Explanation:
u = 30m/s , v = 0(comes to a stop) , t = 6s, a = ?
a = v – u/t
a = 0 – 30/6
a = –30/6
a = –5
A car is moving at 30.0 m/s, east in a straight line approaching the red traffic light as shown. The time it takes for the car to stop is 0.6 seconds. The acceleration of the car is -5 m/s.
What is speed?Speed is defined as the pace at which an object's location changes in any direction. The distance traveled in relation to the time it took to travel that distance is how speed is defined.
Given
u = 30m/s ,
v = 0(comes to a stop) ,
t = 6s
To calculate acceleration we use formula
a = v – u/t
a = 0 – 30/6
a = –30/6
a = –5 m/s
Thus, a car is moving at 30.0 m/s, east in a straight line approaching the red traffic light as shown. The time it takes for the car to stop is 0.6 seconds. The acceleration of the car is -5 m/s.
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A young girl jumps off the edge of a shopping trolley. The trolley is stationary at the moment the girl jumps. The girl jumps backwards. Describe and explain, using the idea of momentum, what happens when the girl jumps off the trolley.
Answer:
Momentum is a physical quantity equal to the product of mass of the object and its velocity. Since velocity is a vector (a quantity that has both magnitude and direction), momentum is a vector quantity as well. According to the law of conservation of momentum, the momentum is always conserved. This means that the initial momentum must be equal to the final momentum. Our initial momentum is zero since both, trolly and the girl on it are stationary. When the girl jumps, she has some velocity v. To compensate for that, the trolly will also move with some velocity v, but in the opposite direction so that the momentum stays conserved.
Explanation:
13. Squids and octopuses take in water and forcibly expel it through the
siphon in a sudden spurt that pushes them through the water. This
propulsion is an example of which Newton's Law?
A. 1st Law
B. 2nd Law
C. 3rd Law
D. All of Newton's Laws
Squids and octopuses forcefully expel water through the siphon after ingesting it, propelling themselves through the water. Third Law of Newton.
Describe the third law of Newton's law?His third law asserts that there is an opposite and an equal response in nature for every action (force). When an object A pulls on an object B, the opposite force is applied to the first object by object B. Alternatively said, interactions lead to forces.
What are examples of the third law of Newton?There are numerous real-world applications of Newton's third motion law. For instance, when you leap, the earth exerts an equal and opposing reaction force that propels you into to the air. This is because when you apply a force to it with your legs, it responds in kind. Rockets and other projectiles are designed using Newton's third law by engineers.
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A 2-meter-long pendulum, is set in motion, at 1.2 m/s, when the pendulum arm is at an angle of 25° from the vertical. Find the speed of the pendulum when it reaches the bottom of its swing.
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Analyze this: A 238.6-N force is applied at an angle of 18.8° above the horizontal
to accelerate a 14.5-kg object across a level surface. The coefficient of friction is
0.247. Complete the diagram.
H=
Units
Force: N
Mass: kg
Accel'n: m/s/s
Tap on a field to enter or edit its value.
0.247
Fnorm=
=Ffrict
Fgrav =
m=
a=
142.1
14.5
Fx
Fapp=
Fy
Fx =
Fy=
238.6
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Tap for Question-Sp
Help Me
Answer:
Minus the components
Explanation:
= minus components and figratives = answer 2 4
multiple choice
15) A coiled spring used to help a door close has ________ ________energy when the door is open.
16) After braking, a bicycle's tires increase in temperature as friction causes some of the
mechanical energy to transfer to ________ energy.
According to conservation of energy, the energy of interacting bodies in a closed system remains constant. The total energy of an isolated system remains constant; it is said to be conserved over a period of time.
Elastic energy is the mechanical implicit energy stored in the configuration of a material or physical system as it's subjected to elastic distortion by work performed upon it. Elastic energy occurs when objects are impermanently compressed, stretched or generally misshaped in any manner.
The mechanical energy is never lost forever , rather it gets converted to thermal energy because of the friction .
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How does Physics connect to the Greenhouse Effect?
Answer: The greenhouse effect is caused by certain gases in the Earth's atmosphere trapping heat from the sun, which leads to climate change. Physics plays a role in understanding this phenomenon and developing solutions to mitigate its effects.
Explanation:
If magnets are knocked around a lot or heated, their magnetism will be reduced or lost. Explain why.
Answer:
so heating a magnet disrupts the domain walls and it becomes easy for the magnet to become ordinarily misaligned and rotate. so when that happens they are now less aligned and point in the opposite direction to the neighbors causing a decrease in the magnetic field and loss of magnetism
the centers of two slits of width a are a distance d apart. if the fourth minimum of the interference pattern occurs at the location of the first minimum of the diffraction pattern for light of wavelength λ, the ratio a/d is equal to:____.
centers of two slots of width an are separated by this amount. If the initial minimum of the diffraction peak of light of wavelength is where the fourth minimum of the interferometer is located, then the ratio a/d is equal to 2/7.
The wavelength, what is it?A waveform signal's wavelength is defined as the separation between two similar points (adjacent crests) in adjacent cycles as the signal travels through space or along a wire. This length in wireless systems is typically expressed in metres (m), centimeters (cm), or millimeters (mm) (mm).
What exactly are wavelengths and frequencies?The wavelength is indeed the distance that separates two wave crests, while troughs have the same wavelength. The number of oscillations which pass over a specific place in a second is known as the frequency and is expressed in seconds of cycles (Hz) (Hertz).
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A weightlifter lifts a 20 kg barbell a distance of 0.4 m in 0.82 s. How much power is demonstrated by the lift?
95.60 watt much power is demonstrated by the lift.
What is power?Energy consumption per second is measured as power. The amount of force necessary to create a unit displacement is another way to quantify power. Power, a scalar quantity, is represented by the letter P. For instance, a light bulb with 100 W of electricity will provide more light than one with 10 W.
Given that,
weight (W) = 20 Kg
distance = 0.4 m
time (t) = 0.82 sec
As we know,
Power (P) = W/t
or, P = (20 kg × 9.8 × 0.4)/ 0.82
or, P = 95.60 watt
Thus, 95.60 watt much power is demonstrated by the lift.
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today, astronomers find compelling evidence that the energy source of the quasars and active galaxies is:_____.
The energy source of quasars or active galaxies is currently thought to be matter falling toward a massive black hole in the center of a galaxy, according to persuasive evidence discovered by astronomers.
How does science define energy?The definition of energy is "capacity to do activity, which is ability to apply force causing motion of an object." Energy is simply the force that moves objects, despite this definition's seeming complexity. Both potential and kinetic energy fall under this category.
what is The importance of energyDue to the fact that it is a fundamental human requirement, energy is crucial to our daily existence. Our constructions, which are constructed by humans, are heated and cooled by energy. Even the simplest tasks like lifting your finger or getting out of bed require energy.
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roller coasters are popular attractions at amusement parks. a cart on a roller coaster approaches the highest point on the coaster. as the cart reaches the top, it slows down.
As it climbs yet another hill, the roller coaster slows down. Kinetic energy is converted into potential energy.
What type of potential energy does the roller coaster have at the top of the loop?The gravitational potential energy (PE = mgh) of an object is the energy it has as a result of its height and is equal to the mass of the object times its height times the gravitational constant. The gravitational potential energy on a roller coaster is highest at the peak and lowest at the bottom. The roller coaster's potential energy is converted into kinetic energy as it travels down the hill at high speed. As it climbs yet another hill, the roller coaster slows down. Kinetic energy is converted to potential energy.
How is energy transferred on a roller coaster?Potential energy is transformed into kinetic energy, which the roller coaster uses to go forward. Once it has around the first hill, it has all the kinetic energy it needs to complete the journey. Different wheel designs make for a comfortable ride once you're moving. Running wheels on the coaster guide it along the track.
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The angular momentum of the propellers of a small airplane points directly forward from the plane. Part A In what direction do the propellers rotate as seen from the rear of the plane? Clockwise Counterclockwise None of the above Submit Request Answer Part B If the plane is flying horizontally and suddenly pulls upward, in which direction does the nose of the plane tend to move? The nose of the plane would veer upward. The nose of the plane would veer to the left. The nose of the plane would veer downward. The nose of the plane would veer to the right. Submit Request Answer
In clockwise direction the propellers rotate as seen from the rear of the plane. If the plane is flying horizontally and suddenly pulls upward, the nose of the plane would veer upward. The correct options are B and A respectively.
The propellers rotate anticlockwise when viewed from the back of the aircraft.
When observed from the rear, an anticlockwise rotation direction corresponds to propellers spinning in the forward direction because the angular momentum of the propellers points directly forward from the plane.
The nose of a plane tends to pull forward when a plane flying horizontally suddenly pulls upward. This is brought on by the direction of the lift force produced by the wings changing.
By raising the nose, the angle of attack widens, increasing the lift force that raises the plane's nose upward. The change in the aerodynamic forces exerted on the aircraft is what causes the nose to rise upward.
Thus, the correct options are B and A respectively.
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Your question seems incomplete, the probable complete question is:
The angular momentum of the propellers of a small airplane points directly forward from the plane. Part A In what direction do the propellers rotate as seen from the rear of the plane?
A. Clockwise
B. Counterclockwise
C. None of the above
Part B If the plane is flying horizontally and suddenly pulls upward, in which direction does the nose of the plane tend to move?
A. The nose of the plane would veer upward.
B. The nose of the plane would veer to the left.
C. The nose of the plane would veer downward.
D. The nose of the plane would veer to the right.
When a person holds an object, it has potential energy. How will the potential energy change if the person lifts the object above his or her heads
The potential energy won't change. if the individual raises the object above their heads.
What transpires when an object is lifted in terms of potential energy?Depending on an object's height and mass, it will have a different amount of gravitational potential energy. The amount of gravitational potential energy an object possesses increases with weight and height above the ground. The relationship between weight, height, and gravitational potential energy.
In short, potential energy is the energy that an object has stored because of its position in relation to a zero position. If an object is located at a height that is higher (or lower) than the zero height, it has gravitational potential energy.
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calculate the change in entropy of 3 moles of liquid water if you heat it from 5Ëšc to 95Ëšc. the molar heat capacity of liquid water is 75.38 j/molk.
Water in liquid form has an entropy change of 63.4 J/K.
define entropy ?
A state of disorder, randomness, or uncertainty is most frequently associated with the scientific concept of entropy, which is also a quantifiable physical property. From classical thermodynamics, where it was first recognized, to the microscopic description of nature in statistical physics, to the fundamentals of information theory, the term and concept are used in a variety of disciplines. It has wide-ranging uses in physics and chemistry, biological systems and how they relate to life, cosmology, economics, sociology, weather science, and information systems, including the transmission of information through telecommunication.
We use the equation to determine the entropy change for the same phase at various temperatures:
ΔS=n x Cp x In(T₂/T₁)
ΔS=3 x 75.38 x In (368/27)
ΔS= 63.4 J/k
therefore the entropy change of the water is 63.4J/k
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The diagram below shows the path of a comet around the Sun.
A
B
C
D
How does the comet's energy change as it moves from point B to point C?
(Assume that total mechanical energy is conserved.)
Since a rotating comet is an isolated system, all of its mechanical energy (motion + potential) and angular momentum are conserved (constant).
What is angular momentum?Angular momentum is the quantity rotation of a body which is the product of its moment.
The angular momentum is given by,
L = mvr
where v= velocity of comet ,
r= distance of comet from sun ,
m= mass of comet,
At position 1, r is smaller therefore v (speed) increases to keep the angular momentum constant, similarly at position r be comes large do the speed v decreases again to keep the angular momentum to the constant , therefore at position 1 speed of the and it is greater than at 2. As speed is larger at 1 , therefore kinetic energy ( K=1/2mv² ) will also be greater at the position 1 compared of position 2 .
Now mechanical energy is the same at both positions of due to energy conservation law .
As mechanical energy is equal =KE+GPE , since it is kinetic energy is greater at the position 1 therefore GPE will be greater at position 2 .
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A 14 kg block is slid from a height of 7,6 m down a friction-less incline. It comes to a flat surface and crosses a 8.6 m strip of sandpaper with a coefficient of friction of
0.19. After passing over the sandpaper, the block is traveling on a friction-less surface again. How fast is the block traveling?
The velocity with which the block is travelling on the frictionless surface is 2.5 m/s.
What is the acceleration of the block?
The acceleration of the block is calculated by applying Newton's second law of motion as follows.
μ = F / N
where;
F is the force of frictionN is the normal force on the 14 kg blockμ is the coefficient of frictionμ = F / N
μ = ma / mg
μ = a / g
a = μg
a = 0.19 x 9.8 m/s²
a = 1.86 m/s²
The time of motion of the block is calculated as follows;
t = √ ( 2h / g )
t = √ (2 x 8.6 / 9.8)
t = 1.33 s
The velocity with which the block is travelling on the frictionless surface is calculated as;
v = u + at
where;
u is the initial velocity of the block = 0a is the acceleration of the block = 1.86 m/s²t is the time of motion of the block = 1.33 secondsv = 0 + (1.86)(1.33)
v = 2.5 m/s
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One important way astronomers can learn in some detail about what happens when galaxies collide is.
Astronomers can learn to simulate the galaxy's collisions on a large computer and watch what the simulation will predict.
What is a galaxy?A galaxy can be described as a system of stars, interstellar gas, dust, and dark matter, bound together by gravity. Galaxies from 100 million stars range in size from dwarf to million stars to the largest galaxies known as supergiants.
Most of the mass in a galaxy is in the form of dark matter, with only a few percentages of that mass visible as stars and nebulae. Supermassive black holes are a common characteristic at the centers of galaxies.
Galaxies can be categorized according to their visual morphology as elliptical, spiral, or irregular. The Milky Way's central black hole or Sagittarius A* has a mass 4 million times greater than the Sun.
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Sara pushed a box of lab equipment along the ground, displacing it by 1 metre. By doing this, she has done __________ on the box of lab equipment.
Sara pushed a box of lab equipment along the ground, displacing it by 1 meter. she has done work on the box of lab equipment.
When a force is applied and an object is moved over a specified distance, a work has been completed. The following formula is used to calculate an object's work,
W = Fd
Where, F is the applied force, and d is the object's displacement.
When we apply force "F" to a block, the body moves with some acceleration or, additionally, its speed increases or decreases depending on the direction of the force. The system's kinetic energy changes as speed increases or decreases. Since we are aware that energy cannot be created or destroyed, it must be changed into another form. This perspective refers to it as completed work.Therefore ,Sara has therefore completed her work on the box of lab equipment when she moves it by 1 m.
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A cat is running at 4.65 m/s and has 91.7 J of kinetic energy. What is the cats mass
the movement of earthy materials from higher region to lower region due to gravitational pull is called
Landslides are caused by earthy elements moving from higher to lower areas as a result of gravity. The sliding down of a slope of a volume of rock, rubble, or earth is known as a landslide.
What creates the attraction of gravity?All things with mass, including our Earth, really bend and curve spacetime, which is what causes gravity to pull you toward the ground. What you experience as gravity is that curvature.
What term best represents the pull of gravity?A mass attracts a mass; the amount of the gravitational force is direct proportion to the masses of both the two items and inverse to the square of both the distance between two pieces. Gravitational force is an electrostatic attraction and exists among the objects with mass.
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An external force of 5 n is applied to a 10 kg object over a time of 3 s. Determine the impulse of the object.
The impulse of the 10kg object is 15Ns.
How to calculate impulse?Impulse is the integral of force over time. The impulse of an object in physics is a term that is used to describe or quantify the effect of force acting over time to change the momentum of an object.
It is represented by the symbol J and usually expressed in Newton-seconds or kg m/s.
According to this question, an external force of 5N is applied to a 10kg object over a time of 3 s. The impulse can be calculated as follows:
Impulse = 5N × 3s = 15Ns
Therefore, 15Ns is the impulse of the object.
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two small objects each with a net charge of q exert a force of magnitude f on each other. two charges q, with equal and opposite forces f we replace one of the objects with another whose net charge is 4q: two charges, q and 4q the original magnitude of the force on the q charge was f; what is the magnitude of the force on the q charge now?
When one of the Charges Q is swapped out for another charge 4Q, there is a force on Q that is 4F strong.
Coulomb's equation of electricity states that the amount of the force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance separating the two charges.
Calculation:Mathematically, F = KQ₁Q₂ /d²
The coulombs law equation gives the magnitude of the force between the items, F, if the initial charges on the two objects are each equal to Q and the distance between the charges is d. i.e. F = KQQ/d².
The force between the charges will now be given as follows if one of the charges is swapped out for a charge 4Q:
F` = KQ₄Q / d²
F` = 4 × KQQ / d²
Comparing the force's initial and ultimate magnitude on the objectsF' = 4F.
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Question:
Two small objects each with a net charge of Q (positive) exert a force of magnitude F on each other. We replace one of the objects with another whose net charge is 4Q. The original magnitude of the force on the Q charge was F; what is the magnitude of the force on the Q now?
A. 16F
B. 4F
C. F
D. F/4
In a uniform motion
- Acceleration is non zero constant
- Direction of velocity may vary
- Speed is not constant
- Velocity and speed are constant
Answer:
pls mark as brainliest
Explanation:
Velocity and speed is constant
calculate the maximum speed that the car can have without losing contact with the road at the top of the hill
The maximum speed that the car can have without losing contact with the road at the top of the hill of radius 50m is 22.14 m/s.
We need to apply the concept of centripetal force, force of gravity that produces the weight and the balance of these two, in order to solve this problem.
The force of weight must be equal to the centripetal force so that the weight must be equal to centripetal force.
∑ F = 0
Fc - Fw = 0
Fc = Fw
mg = mv²/r
where, m is mass
v is velocity
r is radius
Making v as subject, we have, v = √(g * R)
v = √(g * R) = √( 9.8 * 50) = 22.14 m/s
Thus, the velocity of the car that it can have without losing contact with the road is 22.14 m/s.
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racquetball strikes a wall with a speed of 30 m/s and rebounds with a speed of 26 m/s. the 189) collision takes 20 ms. what is the average acceleration of the ball during the collision?
The acceleration of the racquetball during the collision is found to be 1330m/s².
According to the second law of motion proposed by Newton the force on the body is equal to the change in momentum per unit time of the body.
So, we can write,
Ma = M∆V/t
Where,
M is the mass of the body is the,
a acceleration of the body,
∆V is the change in speed of the body after the collision,
t is the time taken during the collision.
It is given to us that the racquetball strikes the wall with a speed of 30m/s and it rebounds with the speed of 26 m/s the collision time is 20 milli seconds.
Putting the values,
a = 30-(-26)/0.02
a = 1330m/s².
So, the acceleration of the racquetball is 1330m/s².
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Thermogenesis has been studied the plants in the genus arum, including skunk cabbage and the corpse flower. In these plants, what hypotheses have been provided to explain the reason behind thermogenesis? select all that apply.
Thermogenesis has been studied the plants in the genus arum, including skunk cabbage and the corpse flower. In these plants, these hypotheses have been provided to explain the reason behind thermogenesis
protection from frost damageleaf production and photosynthesis.seed germination.What is Thermogenesis?Thermogenesis, which takes place in specialised tissues such brown adipose tissue and skeletal muscle, is described as the disposal of energy through the generation of heat.
All metabolic activities involved in keeping the organism in a live condition require mandatory thermogenesis, which takes place in all organs. It also includes the energy used when food is consumed, digested, and processed (thermic effect of food, or TEF).
Thus, the reason behind thermogenesis are:
protection from frost damageleaf production and photosynthesis.seed germination.To know more about thermogenesis refer to:
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a stream is transporting particle a. the velocity of stream is decreasing, but for the moment, particle a is still moving. however, when the water drops below 50 cm/sec, particle a falls below its fall velocity and is deposited. based on this information, what is the likely particle size for this object?
The most likely size of the particle is 10 mm
What happens as the velocity of water in a stream decreases?Point bars are formed as a result of silt deposition brought on by a decrease in water velocity inside the channel bend. Where there are low gradients and a mostly fine-grained load, meandering channels can emerge.
When a particle's velocity falls to the point that the water lacks the kinetic energy to carry it, sediment deposition occurs, causing the particle to fall out of suspension. Silt is a sediment that is bigger than clay but smaller than sand.
Given is a S curve
and in this graph we can see that when the speed of the water is 50 cm/sec in the x axis propotionatily the size of the particle is 10 mm in the y axis.
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