Definition: This is what causes acceleration. Two forces acting opposite each other.
Example: Ben pushes on a heavy box. Friction opposes Ben's push. The box moves. Ben's pushing force is
greater than the friction force.

Earth is surrounded by a magnetic field because of the rotating electric currents by the charged metallic particles in the earth crest.

On earth, electric currents are produced by the movement of liquid metal in the planet's outer core. These electric currents combine to create a magnetic field that surrounds the globe as a result of Earth rotating on its axis.

The magnetic field is crucial to keeping life on Earth alive. Without it, we would be exposed to a lot of solar radiation and our atmosphere would be unrestricted in its ability to escape into space.

A stream of charged particles emerging from the sun, interacts with the magnetic field that stretches from the interior of the earth into space. Electric currents caused by the movement of convection currents of a combination of molten iron and nickel in the earth's outer core produce the magnetic field.

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Answer:

[tex]44.27m/s[/tex]

Explanation:

The kinematic equation

[tex]v_f^2=v_0^2+2ad[/tex]

gives the final velocity [tex]v_f[/tex] of the object given the initial velocity [tex]v_0[/tex], the acceleration [tex]a[/tex], and the distance traveled [tex]d[/tex].

For our case, the object is dropped; therefore,

[tex]v_0=0[/tex]

I.e. the initial velocity is zero. The acceleration due to gravity is

[tex]a=9.8m/s^2[/tex],

and the distance traveled is [tex]d=100m[/tex].

Putting the values into the equation we get:

[tex]v_f^2=0+2(9.8ms^{-2})(100m)\\\\v_f^2=1960\\\\v_f=\sqrt{1960} \\\\\boxed{v_f=44.27m/s}[/tex]

The final velocity of the object is 44.27 m/s.

Answer:

Fields

Explanation:

The presence of a magnet's magnetic field best explains why a magnet can act at a distance on other magnets or objects containing certain metals. The magnetic field is an invisible force field that extends from the magnet, wherein other magnets or certain metals are influenced.

The feature of a magnet that allows it to act at a distance on other magnets or on objects containing certain metals is its magnetic field. A magnet's magnetic field is an invisible force field that extends out from the magnet in a pattern similar to the pattern formed by evenly spaced, radiating lines. Within the magnetic field, other magnets or certain metals are pushed or pulled by the magnetic force. For example, if you slowly bring a piece of iron closer to a magnet, you will feel the iron being attracted towards the magnet even before it physically touches the magnet. That's the magnetic field in action.

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Answer:

the force would not change

Explanation:

the answer is the force would double. i just did the test and got it right!

The answer & explanation for this question is given in the attachment below.

The magnitude of the gravitational force exerted on a rider of mass m during both ascent and descent on an amusement park ride is defined as F = mg, with F being the gravitational force, m the mass of the rider, and g the acceleration due to gravity (~9.81 m/s²).

The gravitational force exerted on a rider with a mass m during both ascent and descent in an amusement park ride is characterized by the same magnitude. This force is given by the expression F = mg, where F is the gravitational force, m is the mass of the rider, and g is the acceleration due to gravity, which is approximately 9.81 m/s² on Earth. Let's break this down:

In both scenarios, note that the actual sensation the rider feels (the 'felt' force) might be different due to the combination of gravitational force and the inertia of the rider's body. This inertia entails a resistance to changes in motion and can lead to what we often describe as the 'thrill' of the ride.

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To explain, I will use the equations for kinetic and potential energy:

[tex]PE = mgh\\KE = \frac{1}{2}mv^{2}[/tex]

Potential energy is the potential an object has to move due to gravity.  An object can only have potential energy if 1) gravity is present and 2) it is above the ground at height h.  If gravity = 0 or height = 0, there is no potential energy.  Example:

An object of 5 kg is sitting on a table 5 meters above the ground on earth (g = 9.8 m/s^2).  What is the object's gravitational potential energy?  (answer: 5*5*9.8 = 245 J)

(gravitational potential energy is potential energy)

Kinetic energy is the energy of an object has while in motion.  An object can only have kinetic energy if the object has a non-zero velocity (it is moving and not stationary).  An example:

An object of 5 kg is moving at 5 m/s.  What is the object's kinetic energy?  (answer: 5*5 = 25 J)

Sometimes, an object can have both kinetic and potential energy.  If an object is moving (kinetic energy) and is above the ground (potential), it will have both.  To find the total (mechanical) energy, you can add the kinetic and potential energies together.  An example:

An object of 5 kg is moving on a 5 meter table at 10 m/s.  What is the objects mechanical (total) energy?  (answer: KE = .5(5)(10^2) = 250 J; PE = (5)(9.8)(5) = 245 J; total: 245 + 250 = 495 J)

Answer: 4N downward

Explanation: If 16N is applied on both the right and left then the object isn't moving either way, so we are left with 4N.

"The net force on the object is 4N downward.

To find the net force acting on the object, we need to consider the vector sum of all the individual forces. Forces acting in opposite directions (to the right and to the left in this case) will cancel each other out.

Given the forces:

- 16N to the right

- 16N to the left

- 4N downward

Since the forces to the right and to the left are equal in magnitude (16N), they will cancel each other out. This leaves us with only the downward force to consider for the net force.

Therefore, the net force [tex]\( F_{net} \)[/tex]is simply the downward force:

[tex]\[ F_{net} = 4N \text{ (downward)} \][/tex]

The horizontal components of the force (to the right and to the left) have no net effect on the object's motion because they are equal and opposite, so they sum to zero in the horizontal direction. The only unbalanced force is the 4N acting vertically downward. Hence, the net force on the object is 4N downward."

The work done is 140.3 J

Explanation:

Final answer:

The work done by the frictional force as the box moves 11.5 meters is -140.3 joules, indicating the force is opposing the box's motion.

Explanation:

To calculate the work done by friction as a box moves across a floor, we need to use the equation for work, which is work done (W) = force (f) × distance (d) × cos(θ), where θ is the angle between the force and the direction of motion. Since friction always acts opposite to the direction of motion, the angle θ here is 180 degrees, and cos(180°) is -1. Therefore, the work done by the frictional force is negative, indicating that it's in the opposite direction to the displacement of the box.

The frictional force between the box and the floor is given as 12.2 newtons, and the box moves 11.5 meters. Substituting the given values into the work equation gives:

W = f × d × cos(180°) = 12.2 N × 11.5 m × (-1) = -140.3 joules.

The negative sign indicates that the work done by the frictional force is in the opposite direction of the displacement, meaning it resists the motion of the box.

Answer:

2621.25 meters

Explanation:

First, write down what we are given.

Initial velocity = 27.5 m/s

Final velocity = 42.4 m/s

Time = 75 seconds

We need to look at the kinematic equations and determine which one will be best.  In this case, we need an equation with distance.  I am going to use [tex]v_{f}^{2} = v_{i}^{2} +2ad[/tex], but you can also use the other equation, [tex]x = v_{o}t+\frac{1}{2}at^{2}[/tex]

We need to find acceleration.  To find it, we need to use the formula for acceleration: [tex]a = \frac{v_{f}-v_{i}}{t}[/tex].  Plugging in values, [tex]a = \frac{42.4-27.5}{75} = .199\ m/s^{2}[/tex]

Next, plug in what we know into the kinematics equation and solve for distance.  [tex]42.4^{2} = 27.5^{2} + 2(.199)(d)\\d = 2621.25\ meters[/tex]

While the elevator is speeding up from zero to 3.25 m/s, the scale reads something more than 600N. But once the elevator settles into a constant speed ... whatever that is ... the scale settles back to 600N.

B) 37 V

The potential difference between point a and point b is equal to 37 V

The potential difference across a and b can be calculated by finding the equivalent resistance of the resistors R1, R2 and R3 and then by applying Ohm's law.

Given:

R1 = 3.0 Ω

R2 = 8.0 Ω

R3 = 10.0

Current = I = 5 A

To calculate equivalent resistance of the circuit:

R2 and R3 are connected in parallel configuration. The equivalent resistance of R2 and R3 can be calculated as

[tex]\frac{1}{R_p} =\frac{1}{R_2} + \frac{1}{R_3} \\\\\frac{1}{R_p}=\frac{1}{8} + \frac{1}{10}= \frac{5+4}{40} = \frac{9}{40} \\\\ \frac{1}{R_p}=\frac{9}{40} \\\\R_p=\frac{40}{9}\ ohms[/tex]

Resistance R1 is in series with Rp. The equivalent series resistance is calculated as

[tex]R_s = R1+R_p = 3+\frac{40}{9}= \frac{27+40}{9} = \frac{67}{9} = 7.44\ ohms[/tex]

Thus the given 3 resistor circuit can be written as an equivalent resistance Rs equal to 7.44 Ω through which current I passes.

By Ohm's law;

If V is the potential difference between a and b

Potential difference across points a and b = Current flowing through the circuit × Resistance between points a and b

[tex]V = I\times R_s = 5\times 7.44 = 37.2\ V[/tex]

37.2 V ≈ 37 V

Therefore, the potential difference between point a and point b is equal to 37 V

Answer:

Explanation:

37V

Answer:

4. 9

Explanation:

For instance, if the speed of an object becomes double, its kinetic energy changes to four times the initial kinetic energy.Similarly, if the speed of the object triples the kinetic energy becomes nine times the initial kinetic energy.

Therefore the answer is 9.

Assume they weigh the same: If Sally is pushed harder than Bill,  Bill would come back sooner, Bill has a greater amplitude.  Assume Bill is heavier than Sally: If both are pushed equally hard, Bill would come back sooner, Sally has a greater amplitude

Explanation:

The amplitude of a wave refers to the maximum amount of displacement of a particle on the medium from its rest position. In a sense, the amplitude is the distance from rest to crest. Similarly, the amplitude can be measured from the rest position to the trough position.

In simpler terms, amplitude stands for the maximum extent of a vibration or oscillation, measured from the position of equilibrium. Amplitude is proportional to the energy of a wave, a high energy wave having a high amplitude and a low energy wave having a low amplitude.

Answer:

C. The provider's success claims seem too good to be true.

Answer:

carbon

Explanation:

Answer:

12,750

Explanation:

P = mv

Momentum = Mass x Velocity

Plug it in and finish equation

Answer:

P=12,750kgm/s

Explanation:

Momentum (P) = mass x velocity

Where velocity =15m/s

Mass=850kg

Therefore, momentum(P) = (850kg) x (15m/s)=12,750kgm/s

Hence,the momentum of the train is 12,750kgm/s

Answer: 130000 J

Explanation: Work is the product of force and distance.

W = F x d

= 5200 N x 25 m

= 130000 J

Answer:

No sand doesn't stay sand forever.

Explanation:

Answer:

Refraction

Explanation:

Refraction is the change in direction of waves that occurs when waves travel from one medium to another. Refraction is always accompanied by a wavelength and speed change. Diffraction is the bending of waves around obstacles and openings.

Waves bend or 'refract' when they move from one medium to another and change speed. This bending is impacted by the properties of the mediums and the angle of the incident wave. A common example is the apparent bending of a stick immersed in water, which we see as a result of light wave refraction.

The bending of waves, whether light, sound, or oceanic, is primarily caused by a phenomenon known as refraction. Refraction occurs when a wave moves from one medium to another, causing a change in speed and resulting in bending of the wave. A typical example of this is the apparent bending of a stick when it is partially immersed in water; what we're seeing is the refraction, or bending, of light waves as they move from water to air.

The extent of bending, or refraction angle, depends on the nature and properties of the transmitting mediums and the incident wave angle. When waves cross the boundary between different mediums at an angle, one side of the wave changes speed before the other, causing the wave to bend towards the medium that slows it down.

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A) Force: 0.0528 N

B) Power dissipated: 0.307 W

C) Power delivered: 0.307 W

Explanation:

A)

The  force experienced by a current-carrying wire in a magnetic field is given by

[tex]F=ILB[/tex]

where

I is the current in the wire

L is the length of the wire

B is the strength of the magnetic field

In this problem, we have:

L = 0.451 m

B = 0.751 T

I = 0.156 A

Therefore, the force is

[tex]F=(0.156)(0.451)(0.751)=0.0528 N[/tex]

B)

The rate of energy dissipation in the resistor is the power dissipated in the resistor, and it is given by

[tex]P=I^2R[/tex]

where

I is the current in the resistor

R is the resistance

For the wire in this problem,

I = 0.156 A

[tex]R=12.6\Omega[/tex]

Therefore, the power dissipated is

[tex]P=(0.156)^2(12.6)=0.307 W[/tex]

C)

The mechanical power delivered to the rod is given by

[tex]P=VI[/tex]

where

V is the potential difference across the rod

I is the current in the rod

The potential difference across the rod must be equal to the potential difference across the resistance, which can be  found by using Ohm's law:

[tex]V=RI=(12.6 \Omega)(0.156 A)=1.97 V[/tex]

Therefore, the power delivered to the rod is

[tex]P=(1.97 V)(0.156 A)=0.307 W[/tex]

This power is equal to the power dissipated on the resistor: this is due to the law of conservation of energy, in fact the total energy must remain constant, so here the electric energy is transformed into mechanical energy of motion of the rod.

Answer:

The less distance between the objects, the more force there is between them.

Relationship between the gravitational force and distance shown in the graph is

>increases, decreases.

As most gravitons exist in a cloud around any object so when distance from the object increases, the density of the graviton cloud goes decreases. There is less gravitational attraction due to this.

The relationship between the force of gravity and distance between the objects is explained by inverse square law. This implies that the force of gravity between objects is inversely proportional to the square of the distance.

Any influence that causes an object to undergo a change is called force. Distance implies how far an object travels over a period of time. When the force applied is greater on an object, it will travel more distance.

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Answer:

C) The gravitational forces of people is so small it is overshadowed by that of Earth.

To calculate the velocity of sound in air using the given information, we'll use the formula:

Speed=(distance)/(Time).Therefore, the velocity of sound in air is 332m/s.

To calculate the velocity of sound in air using the given information, we'll use the formula:

Speed=(distance)/(Time)

Given:

Time taken for the echo(t) = 0.2 seconds

Distance between the person and the hill(d) = 33.2 meters

Firstly, recognize that the sound traveled twice the distance (to the hill and back) to create the echo.

So, the actual distance the sound traveled is 2×distance=2×33.2meters=66.4meters.

Next, use the formula for speed:

Speed=(distance)/(Time)

Speed=(66.4m)/(0.2s)

Speed=332m/s

Therefore, the velocity of sound in air is 332m/s.

Answer: A. 1.77x10-² N

Explanation: Newton's Law of Universal gravitation is expressed in the following formula:

F= G x ( m1 x m2 ) / r²

= 6.673x10-¹¹ N.m²/kg² ( 2.0x10⁴ kg x 3.0x10⁴ kg) / (1.5m )²

= 0.0177 N or 1.77x10-² N

Which statements describe the Mercalli scale? Check all that apply.

A. This scale measures seismic waves based on their size.

B. This scale rates an earthquake according to how much damage it causes.

C.This scale produces a single rating for earthquakes that reach the surface.

D. This scale uses Roman numerals to rank the damage caused by an earthquake.

E.This scale measures the magnitude of an earthquake based on the size of seismic waves.

The Mercalli scale : This scale rates an earthquake according to how much damage it causes and This scale uses Roman numerals to rank the damage caused by an earthquake.

The Modified Mercalli scale is intended to illustrate the consequences of an earthquake, at a contracted station, on tangible characteristics, on modern fittings and human beings.

The Modified Mercalli Intensity value ascribed to a particular site subsequent an earthquake has an extra significant means of severity to the nonscientist than the magnitude because intensity assigns to the outcomes really encountered at that position. This scale is comprised of 12 growing levels of intensity, denoted by Roman numerals, arranging from gradual shaking to catastrophic impairment.

Answer:

It is easier to move empty cart than of moving 20 empty carts because of surface that can affect balancing the carts in same array which makes the carts of array to move in different directions.

Final answer:

It's easier to get one empty cart moving than 20 because a single cart has less inertia and friction to overcome compared to the combined inertia and friction of 20 carts.

Explanation:

The question you've asked pertains to the subject of physics, specifically the principles of inertia and momentum. Inertia is the tendency of an object to resist changes to its state of motion. When you have one empty cart, the inertia is relatively low compared to a line of 20 empty carts. Therefore, it requires less force to get one cart moving than 20 carts because the combined inertia of all the carts is greater, hence more force is needed to overcome it.

In addition to inertia, frictional forces also play a part. Each cart adds its own frictional resistance to the total system. Thus, when you try to push 20 carts, you're trying to overcome the frictional force of 20 sets of wheels on the surface as opposed to just one. This makes it substantially more difficult to get the line of carts moving compared to just one cart.

Answer:

2,158N

Explanation:

According to the second newtons law of motion, Force(F) = mass(m) × acceleration (a)... 1

Given mass to be 800kg.

We need to get the acceleration of the body using one of the equations of motion.

v²= u²+2as ... (2)where;

v = final velocity = 50km/hr

u = initial velocity = 20km/hr

a is the acceleration

s is the distance covered by the boat = 30m

Converting 50km/hr and 20km/hr to m/s, this gives us

50km×1000m/1hr×3600s

= 50000/3600

= 13.9m/s

Similarly,

20km/hr = 20000m/3600s

= 5.6m/s

Substituting this values into the equation 2 to get acceleration, we have

13.9²= 5.6²+2a(30)

193.21 = 31.36+60a

60a = 193.21-31.36

60a = 161.85

a = 2.69m/s²

To get the force on the both we substitute the value of mass and acceleration in equation 1

F =ma

F = 800×2.69

F= 2,158N

Therefore the force of friction on the boat is 2,158N

Boyle's Law states that the volume of a gas decreases as pressure increases at constant temperature. This is a fundamental concept in Chemistry.

Boyle's Law, a fundamental principle in Chemistry and Physics, states that at a constant temperature, the volume of a gas is inversely proportional to the pressure applied on it. So, if the pressure on a gas increases and the temperature remains constant, the volume of the gas correspondingly decreases (Option B). In other words, if you squeeze a gas (increasing the pressure), it will take up less space (decreasing the volume), provided the temperature does not change.

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Answer:

float

Explanation:

a less dense material will float when placed in a material that is more dense than itself. The reverse is also true, that a denser material will sink when placed into into a less dense material.

formula for wavelength = speed/frequency

So 1500/200 = 7.5 meters

The wavelength of the wave is 7.5m.

The wavelength of light is described as "the distance between two consecutive peaks or troughs of a light wave" which is denoted by the Greek letter lambda (λ). Therefore, the distance between one crest or trough of one wave and the next wave is known as wavelength.

Wavelength can be expressed as:

[tex]\lambda=\frac{v}{f}\\\lambda = wavelength\\{v} = velocity\\{f} = frequency[/tex]

λ represents wavelength which is expressed in meters. The v is wave velocity that is calculated as meters per second (mps) and the f stands for frequency, which is measured in hertz (Hz).

For above given information,

speed of a wave is 1500 m/s

frequency is 200 Hz

So, wavelength= 1500/200= 7.5m

Thus, the wavelength of the wave is 7.5m.

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