2. A boy walks 3 miles north then turns around and walks on the same path
south for 2.1 miles. What is the boy's displacement?

You could purchase a fitness tracker to help your performance in your current physical activity.

Fitness tracker would help you in the area of goal setting.

Fitness trackers are effective because they have helped my friends to improve workout routine.

Wearable fitness trackers can monitor data like heart rate, number of steps taken, distance traveled, and number of calories burned.

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Working with a coach or personal trainer can help you attain your fitness objectives by offering personalized training regimens, comments on form and technique, and accountability.

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Answer:

mars

Explanation:

it is the fourth planet of the solar system

Answer:

a. democracy

Explanation:

beacouse the government control of their members

Answer:

Explanation:

If the work done on the cart is NET work

Then the work will result in an increase in kinetic energy

KE₀ + W = KE₁

½mv₀² + W = ½mv₁²

½(0.80)(0.61²) + 0.91 = ½(0.80)v₁²

v₁ = 1.626991...

v₁ = 1.6 m/s

The speed of the cart at the second point of observation is equal to 1.62 m/s.

Work can be demonstrated as the energy utilized when a force is exerted to make an object move through a particular displacement. Work done by this force is calculated from the product of the magnitude of the exerted force (F) and the distance (d) covered by the body

W= F.d

Where 'F' is the exerted force and 'd' is the displacement and W is work done.

Work and energy have a direct relationship with each other. Work done by an object can be expressed as a change in kinetic energy:

\(W =\frac{1}{2}mv_2^2- \frac{1}{2}mv_1^2\)

Where m is the mass of the object, v₂ is the final velocity (m/s), and v₁ is the initial velocity (m/s).

Given, the work done by the cart, W = 0.91 J

The mass of the cart, m = 0.80 Kg

The speed of the cart at the first point, v₁ = 0.61 m/s

\(0.91 =\frac{1}{2}\times 0.80 \times v_2^2- \frac{1}{2}0.80 \times (0.61)^2\)

0.40 v₂² = 1.06

v₂² = 2.65

v₂ = 1.62 m/s

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Answer: Hello! I'm Jungkook. Here is your answer.....

A. conductivity

Explanation:

Hope this helps! Anneyong/Bye!

xoxoKookie

The radii of the first five Fresnel zones is 3.6 mm.

Distance from the light source to the wave surface, d₁ = 1 m

Distance from the wave surface to the observation point, d₂ = 1 m.

Wavelength of the light used, λ = 5 x 10⁻⁶m = 5 μm

The expression for the radius of the Fresnel zones is given by,

rₙ = √[nλd₁d₂/(d₁ + d₂)]

Therefore, the radii of the first five Fresnel zones is,

r₅ = √[5 x 5 x 10⁻⁶x 1 x 1/(1 + 1)]

r₅ = √(25 x 10⁻⁶/2)

r₅ = 3.6 x 10⁻³m

r₅ = 3.6 mm

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Note the rate at which oil is flowing is: 7.19 m³/s . See the computation below.

We can use the principle of continuity of flow to solve this problem. According to this principle, the mass flow rate of the oil is:

m_dot = rho * A * v: where:

rho is the density of the oil,

A is the cross-sectional area of the pipe, and

v is the velocity of the oil.

The cross-sectional area of the pipe before the constriction is:

A1 = (pi/4) * d1² = (pi/4) * (0.978 m)² = 0.7526 m²

The cross-sectional area of the pipe after the constriction is:

A2 = (pi/4) * d2² = (pi/4) * (0.5868 m)² = 0.2701 m²

The velocity of the oil can be calculated using the principle of continuity of flow:

A1 * v1 = A2 * v2

where v1 is the velocity before the constriction and v2 is the velocity after the constriction.

Solving for v1, we get:

v1 = (A2/A1) * v2 = (0.2701 m^2 / 0.7526 m^2) * v2 = 0.3590 * v2

The pressure difference across the constriction is:

deltaP = P1 - P2 = 7600 N/m² - 5700 N/m² = 1900 N/m²

Using Bernoulli's equation, we can relate the pressure difference to the velocity difference:


deltaP = (1/2) * rho * (v2² - v1²)

Substituting the expression for v1, we get:

deltaP = (1/2) * rho * (v2² - 0.1290 * v2²)

Solving for v2, we get:

v2 = sqrt(2 * deltaP / rho * (1 - 0.1290)) = 20.16 m/s

Finally, the mass flow rate of the oil is:

m_dot = rho * A1 * v1 = 821 kg/m³ * 0.7526 m² * 0.3590 * 20.16 m/s
= 5904.4 kg/s

Converting to cubic meters per second, we get:

Q = m_dot / rho = 5904.4 kg/s / 821 kg/m³ = 7.19 m³/s

Therefore, the rate at which oil is flowing is 7.19 m³/s

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The reaction of load L is 0 (no horizontal force), and the reaction of load R is 10 kN (vertical upward force).

To determine the reactions of the loads L and R, consider the equilibrium of the forces acting on the structure.

First, analyze the vertical equilibrium. The sum of the vertical forces must be zero:

ΣFy = R − 7 kN − 3 kN

ΣFy = 0

This gives:

R = 10kN

Next, analyze the horizontal equilibrium. The sum of the horizontal forces must be zero:

ΣFx = L

ΣFx = 0

This indicates that there is no horizontal force acting on the structure.

Therefore, the reaction of load L is zero (no horizontal force), and the reaction of load R is 10 kN (vertical upward force).

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Answer:

please I do not understand that question

That's a great question !

The answer is: It does !

A push on an object causes the object to accelerate in the direction of the force.  

The less mass the object has, the more the force accelerates it.

Now, when you jump, the forces on you and on the Earth are equal forces.

The up force on you causes you to accelerate up by some amount.

The down force on the Earth causes the Earth to accelerate down by some amount.

The Earth's mass is something like 5,972,000,000,000,000,000,000,000 kg, while your mass is something like 50 kg.

The Earth has something like 119,400,000,000,000,000,000,000 times as much mass as you have.

So your acceleration is something like 119,400,000,000,000,000,000,000 times as great as the Earth's acceleration.

==> The Earth's downward acceleration, caused by your jump, is there.  It's just too small to notice.

BUT . . . That's the reason why seismometers (instruments to detect and measure the vibrations from distant earthquakes) have to be located as far as possible from cities and busy roads.

In places that are too close to cities and roads, the Earth's surface is always vibrating, wiggling, jiggling, heaving and weaving, in reaction to the forces of people walking around, cars and trucks driving around, even rain falling down.  And kids jumping up and down !  

In such places, these people-motions are louder and stronger than the vibrations coming from distant earthquakes.  Seismometers wouldn't work there.    

The force the rod exerts on the ball at the given angle is determined as 3.94 N.

The force exerted is calculated as follows;

F = ma

F = mv²/r

F = mω²r

where;

r = 2cosθ

ωf² = ωi² + 2αθ

where;

ωf² = (1)² + 2(2)(15 x π/180)

ωf² = 2.04

ωf = √2.04

ωf = 1.428 rad/s

F = mω²(2cosθ)

F = (1)(1.428)²(2 x cos15)

F = 3.94 N

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Answer:

60n left

Explanation:

Do

Answer:

12.75N

Explanation:

Let's consider the forces acting on the bar:

Weight of the bar (W = 30.0 N): It acts vertically downward, passing through the center of gravity of the bar.

Tension in cord 1 (T1): It acts horizontally and to the left, making an angle of 90° with the bar. Since cord 1 is massless, it does not contribute to the torque.

Tension in cord 2 (T2): It acts at an angle φ = 40.0° with the vertical.

To find the tension in cord 1 and cord 2, we need to set up torque equilibrium equations. The torque of the weight about the point of suspension must be balanced by the torques of the tensions in cords 1 and 2.

Taking the left end of the bar as the reference point (pivot), the torque equilibrium equation can be written as:

Torque due to weight = Torque due to T1 + Torque due to T2

The torque due to the weight is calculated as follows:

Torque due to weight = Weight of the bar * Perpendicular distance between the weight and the pivot point

The torque due to T1 is zero since it acts along the line of action passing through the pivot point.

The torque due to T2 can be calculated as follows:

Torque due to T2 = T2 * Perpendicular distance between the cord and the pivot point

Using the given values:

Weight of the bar (W) = 30.0 N

Length of the bar (L) = 3.0 m

Distance of the center of gravity from the left-hand end of the bar (d) = 2.2 m

Angle between cord 2 and the vertical (φ) = 40.0°

We can calculate the perpendicular distance between the weight and the pivot point as:

Perpendicular distance = L/2 - d

Using these values, we can solve for T2:

30.0 N * (L/2 - d) = T2 * L * sin(φ)

Let's substitute the given values and solve for T2:

30.0 N * (3.0/2 - 2.2) = T2 * 3.0 * sin(40.0°)

T2 ≈ 12.75 N

Therefore, the tension in cord 2 (T2) is approximately 12.75 N.

The minimum deceleration required to stop the car in 35 meters is 40000 m/s^2.

Deceleration is defined as  the decrease in speed as the body moves away from the starting point.

The minimum deceleration required can be calculated using the equation of motion:

d = v^2 / (2 * a)

where d is the distance, v is the initial velocity, and a is the acceleration.

Rearranging the equation to solve for a:

a = v^2 / (2 * d) = (3500 m/s)^2 / (2 * 35 m) = 40000 m/s^2

In conclusion, , the minimum deceleration required to stop the car in 35 meters is 40000 m/s^2.

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Answer:

simply because they all have direction

Explanation:

vector quantities are quantities which have both magnitude and direction.Force,acceleration and velocity have both magnitude and direction.

Answer:

True

Explanation:

According to Chargaff's rule, the amounts of adenine (A), thymine (T), and guanine (G) in the DNA molecule are equal to each other. The amounts of cytosine (C) and guanine (G) are also equal.

Erwin Chargaff was a biochemist, author, Bucovinian Jew who immigrated to America during the Nazi era, and professor of biochemistry at Columbia University's medical school.

Chargaff found patterns among the four bases, or chemical building blocks, of DNA, which are directly related to DNA's function as the genetic material of living things.

He was born in Austria-Hungary. Heraclitean Fire: Sketches from a Life Before Nature, an autobiography he penned, received positive reviews.

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The velocity of the car A as observed from car B is (15i - 22.5j) m/s

The acceleration of car A as observed from car B is 4.5j m/s²

The velocity of car A and car B in m/s is equal:

VA = 54 km/h * 5/18 = 15 im/s

VB = 81 km/h * 5/18 = 22.5 jm/s

The relative velocity is:

\(v_{AB} = v_{A} - v_{B} =\) (15 i -22.5 j ) m/s

The acceleration of the cars are:

\(a_{A} = v^{2}_{A} = 15^{2} /150 =1.5 jm /s^{2}\)

The relative acceleration is:

\(a_{AB} = a_{A} - a_{B} =\) 1.5- (-3), negative - because - the - car - is- slowly - down

\(a_{AB\) = 4.5 jm/ \(s^{2}\)

The relative velocity is defined as the velocity of an object with respect to another observer. It is the time pace of change of relative position of one object with respect to another object.

The relative acceleration (also or ) is the acceleration of an object or observer B in the rest casing of another object or observer A. Acceleration of B relative to An is =ab−aa.

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Answer:

Increase the rate and the same maximum energy of the electrons

Explanation:

According to the photoelectric effect we can say:

I hope it helps you!

Answer:

3kg

Explanation:

3kg is the appropriate mass

Answer:

3kg

Explanation:

just took the test

Explanation:Beta Rays are not Electromagnetic Waves

Beta rays also known as beta radiation is obtained through the emission of an electron. Beta rays are not electromagnetic waves because they are charged particles and are capable of getting deflected by the magnetic field.

Microwaves are a form of "electromagnetic" radiation; that is, they are waves of electrical and magnetic energy moving together through space. Electromagnetic radiation spans a broad spectrum from very long radio waves to very short gamma rays. ... But the most common consumer use of microwave energy is in microwave ovens.

Visible light is carried by photons, and so are all the other kinds of electromagnetic radiation like X-rays, microwaves and radio waves. In other words, light is a particle.

So the answer is sound.

The sound wave is not an electromagnetic wave

In terms of science, electromagnetic radiation is made up of electromagnetic field waves that travel over space while carrying electromagnetic radiant energy and velocity. It consists of X-rays, gamma rays, microwaves, infrared, light, and radio waves.

In order from highest to lowest energy, the sections of the EM spectrum are named: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves.

Given data ,

Let the electromagnetic wave be represented as A

Now , when A = microwaves

Microwaves are waves of electrical and magnetic energy traveling across  radio waves and infrared radiation on the electromagnetic spectrum combined. There is a wide range of electromagnetic radiation, from very lengthy radio waves to very brief gamma rays.

And , when A = x-rays

X-rays are high-frequency, and thus high-energy, electromagnetic radiation

They are found to reside between ultraviolet radiation and gamma rays on the electromagnetic spectrum.

X-rays are more energetic because they have shorter wavelengths. When discussing X-rays, we frequently refer to their energy rather than its wavelength.

Now , the sound waves are not electromagnetic waves as sound waves are examples of mechanical waves

Hence , sound waves are not electromagnetic waves

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Answer:

B. A problem or need is identified

Explanation:

hoep this helps

Answer:

B

Explanation:

edge

"The energy of the electromagnetic radiation from the highest to lowest energy is given as gamma rays, x-rays, ultra-violet radiation, visible light, infrared radiation and the radio waves."

The range of all forms of electromagnetic radiation is known as the electromagnetic spectrum. Electromagnetic waves typically move at velocities close to the speed of light in a vacuum.

Depending on how they are created, how they interact with matter, and how they are used practically, electromagnetic waves in these various bands have distinct properties.

The lowest energies are allegedly found in radio waves and micro waves.

With over 10,000 times more energy than the photons of visible light, gamma rays are the most powerful type of electromagnetic radiation. Their wavelength is the shortest. Nuclear blasts and radioactive atoms both produce these waves.

In the given question. The drop menu is missing. The order of electromagnetic radiation is given generally.

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Answer:

no..

Explanation:

in balanced force it will or in this case u would stay still or u would move at the same speed.. but when u jumps the speed changes..so this is an unbalanced force

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For a system released from rest at θ = 0° when a constant couple moment M = 100 N.m is applied,  the speed of the 10-kg block is mathematically given as

V=4.33m/s

Generally, the equation for the workdone  is mathematically given as

W=T tehta<dtheta

W=100(90*\pi/180)

W=1.5707*100

W=1.57Nm

The change in potential energy across the pulley

dP=mgh

dp=10*9.81*111.8

dp=10.97J

For the thrid position, potential energy is

dP=mg(0.3)

dP=17.658J

dP'=17.658J-13.125

dP'=-4.532J

For 2nd position dP=0

The change in Kinectic energy across the pulley\

dK.E=0.5mv^2

For 1st

dk.E=0.5m(10)^2

2nd

dK.E=0.5Iw^2

dK.E=0.5(7.5*10^-3)(v^2/0.05)^2

3rd

2nd=3rd

In conclusion,

157.07=dKE+dP.E

157.07=5v^2+ (7.5*10^-3)(v^2/0.05)^2+10.97-4.53

V=4.33m/s

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An astronaut measure the period of a mass spring system on Earth.

The period of a mass spring system on the moon would be longer than the period on Earth. This is because the period of a mass spring system is dependent on the square root of the ratio of the mass to the spring constant, and the acceleration due to gravity. Since the acceleration due to gravity on the moon is only 1/6th of that on Earth, the restoring force on the mass will be weaker, resulting in a longer period. Therefore, the astronaut would measure a longer period for the same mass spring system on the moon than on Earth.

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Answer:

The magnetic force was much stronger on Wednesday because the magnetic force is stronger closer to the magnets.

Explanation:

The magnetic force was much stronger on Wednesday than on Tuesday because the magnetic force is stronger closer to the magnets. Therefore claim 3B is more convincing.

Magnetic force can be described as a consequence of electromagnetic force which is caused due to the motion of charges. A moving charge surrounds itself with a magnetic field and the force that arises due to interacting magnetic fields.

The magnetic force between two moving charges is the effect exerted upon either charge by a magnetic field generated by the other. The magnetic force depends on the charge, the motion of each of the objects, and the separation between them.

The magnitude of the force is determined by the cross product of velocity and the magnetic field is equal to q.[v × B]. The resultant force can be described as perpendicular to the direction of the velocity and the magnetic field.

Therefore, the magnetic force was much stronger closer to the magnets.

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