A 25 kg box is being pulled at a constant velocity with a tension force of 65 N. what is the coefficient of friction between the box and the ground?

Force is applied to change the kinetic energy of an object.

Energy is closely related to Newton's laws of motion, which describe the behavior of objects in motion.

For instance, the first law of motion, also known as the law of inertia, states that an object at rest will remain at rest, and an object in motion will remain in motion at a constant velocity, unless acted upon by an external force.

This law is related to energy because an object in motion has kinetic energy, which is the energy associated with its motion. In order to change the motion of an object, an external force must be applied, which can change the object's kinetic energy.

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The force exerted on the eardrum at the bottom of a 2.9m deep water-filled pool is approximately 1.4 x 10^-3 N, taking into account the pressure of the water and the atmosphere.

The pressure at the bottom of the water-filled pool can be calculated using the formula P = rho * g * h, where rho is the density of water (1000 kg/m^3), g is the acceleration due to gravity (9.81 m/s^2), and h is the depth of the pool (2.9 m). Thus, P = (1000 kg/m^3) * (9.81 m/s^2) * (2.9 m) = 28410 Pa. The total force exerted on the eardrum is then the product of pressure and area: F = P * A = (28410 Pa) * (5.0 x 10^-5 m^2) = 1.4 x 10^-3 N. This force takes into account the pressure of the water as well as the atmospheric pressure.

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Answer:

D

Explanation:

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The energy an object has while it is moving is called kinetic energy, or the energy of motion. Thus, the correct option for this question is D.

Kinetic energy may be defined as a type of energy that an object possesses due to its motion. It is defined as the work that is required in order to accelerate a body of a given mass from rest to its stated velocity. It is also known as the energy that is possessed by an object by the virtue of its motion.

Kinetic energy is the energy of motion, observable as the movement of an object, particle, or set of particles. Any object in motion is using kinetic energy: a person walking, a thrown baseball, a crumb falling from a table, and a charged particle in an electric field are all examples of kinetic energy at work.

Therefore, the energy an object has while it is moving is called kinetic energy, or the energy of motion. Thus, the correct option for this question is D.

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v= constant

mass of the cart = 1.5 kg

m2 (added)= 7.5 kg

The correct restart is for there to be another kick off taken in this type of scenario.

This is a method of restarting play in which the ball is put on the center circle and passed by a player.

Kick offs occur at the beginning of any halves or when a goal is scored during the match which is why it's the most appropriate choice.

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Answer:Kick offs occur at the beginning of any halves or when a goal is scored during the match which is why it's the most appropriate choice.

Explanation:

Answer:

Shed

Explanation:

Snakes have to shed, or else their skin will become really crusty and flaky. Especially the ones that live in a desert. The sun destroys their skin, as it isn't as strong as ours.  

The optical effect that is essential to the visual experience of motion pictures is known as Persistence of Vision.

Persistence of Vision (POV) is a phenomenon of the eye where an image or object is perceived by the brain for a short period of time after the image or object has been removed from the viewer's sight. The phenomenon occurs because of the retina's temporary retention of visual images even after they have been seen.

The Persistence of Vision enables the human eye to perceive the illusion of motion when viewing a series of still images in rapid succession. This effect is the foundation for the creation of motion pictures. In films, a sequence of still images is displayed in rapid succession (typically at a rate of 24 frames per second) that simulates motion to the human eye, tricking it into believing that the images are moving in a fluid and natural way.

POV is an essential aspect of the visual experience of motion pictures as it allows filmmakers to create an illusion of motion using a series of still images. The human eye is capable of retaining images for a short period of time after they have disappeared from the field of vision, which makes this effect possible.

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The new breathing rate on the mountain top would be approximately 12.6 grams of nitrogen per minute.

To calculate the new breathing rate at a different altitude with different temperature and pressure, we can use the formula for the Ideal Gas Law:

PV = nRT

where;

Assuming that the volume of air breathed in and out remains constant, we can rearrange the Ideal Gas Law formula to solve for n/V, which gives us the number of moles of air per unit volume of air:

n/V = P/RT

If we assume that the air being breathed is mostly nitrogen, which makes up about 78% of the atmosphere, we can use the molar mass of nitrogen (28.0134 g/mol) to convert from moles of air to grams of nitrogen.

So the formula for the rate of breathing in grams of nitrogen per minute is:

Rate = (n/V) x (molar mass of nitrogen) x (breathing rate in breaths per minute)

First, we need to convert the pressure from 760 mmHg to 240 mmHg:

P1/T1 = P2/T2

where;

Solving for P2:

P2 = P1 x (T2/T1) = 760 mmHg x (5+273.15)/(18+273.15) = 602.5 mmHg

Now we can calculate the new n/V:

(n/V)2 = (P2/RT2) = (602.5 mmHg)/(0.0821 L atm/mol K x 278.15 K) = 0.0268 mol/L

Finally, we can calculate the new breathing rate in grams of nitrogen per minute:

Rate2 = (n/V)2 x (28.0134 g/mol) x (16 breaths/min) = 12.6 g/min

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After connecting the conducting wire, the spheres will redistribute charges until they both have a charge of -1C.

To determine the new charges on the spheres, we need to consider the principle of charge conservation, which states that the total charge before and after an interaction remains the same.

Let's assume that the spheres have charges Q1 and Q2 initially. In this case, Q1 = -3C and Q2 = +1C.

When a conducting wire is connected between the spheres, charge can redistribute until the system reaches equilibrium. Since the spheres are conducting, charges are free to move within them.

In the final state, the charges on the spheres will redistribute to reach a new equilibrium. Let's assume the new charges on the spheres are Q1' and Q2'.

According to the principle of charge conservation, the total charge before and after the connection remains the same:

Initial total charge = Q1 + Q2 = -3C + 1C = -2C

Final total charge = Q1' + Q2'

Since the total charge remains the same, we can write the equation:

Q1' + Q2' = -2C

Since the spheres are of equal size, we can assume that the charges redistribute equally:

Q1' = -1C

Q2' = -1C

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The question probable may be:

A conducting wire is connected between two conducting spheres of equal size have a charge of -3C and +1C respectively. Find out the new charge on each sphere ?

Answer:

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Binocular disparity refers to the slight difference in the images captured by the two eyes, which the brain uses to perceive depth.

The ability to use binocular disparity as a depth cue is essential for proper depth perception in humans and other animals with binocular vision. This cue is particularly important for perceiving depth in objects that are close to the observer. The brain processes the information from both eyes and combines them to create a 3D perception of the world around us. Without the ability to use binocular disparity as a depth cue, individuals may experience difficulties with spatial perception, which can impact daily activities such as driving or playing sports.

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The carriage loses momentum as it passes through the tank, causing water to be pushed forwards with a speed of 19 m/s in the direction of the carriage's motion.

When the carriage moves through the tank, it experiences a loss of momentum. Momentum is a fundamental concept in physics that relates to the motion of an object and is defined as the product of its mass and velocity. The change in momentum of the carriage occurs due to external forces acting upon it, such as the resistance from the water in the tank.

As the carriage loses momentum, Newton's third law of motion comes into play. According to this law, for every action, there is an equal and opposite reaction. In this case, the action is the loss of momentum by the carriage, and the reaction is the forward push of water with a speed of 19 m/s in the direction of the carriage's motion.

The phenomenon can be explained by the principle of conservation of momentum. As the carriage loses momentum, an equal amount of momentum is transferred to the water in the tank, causing it to move forward with the mentioned speed. This transfer of momentum demonstrates the interaction between the carriage and the water, with the water gaining momentum as the carriage loses it.

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The most distant stars we can currently measure stellar parallax for are approximately 1,000 parsecs away.

A parsec is a unity used to measure distance in the Universe, which is hard to understand with human thinking.

A parsec equals to approximately 3.20 light-years, which is  a small distance in the Universe.

In conclusion, the most distant stars we can currently measure stellar parallax for are approximately 1,000 parsecs away.

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Answer:

A. stronger prevailing winds and more hurricane activity

Explanation:

edg2020

Answer:A

Explanation:

The plane travels a distance of 325 miles if the airplane travels for 2.5 hours at an average speed of 130 miles per hour. Using the distance formula (d = rt), we can calculate the distance.

To find the distance traveled by the airplane, we can use the distance formula, which is represented as d = rt. In this formula, "d" represents the distance, "r" represents the rate or speed at which the object is traveling, and "t" represents the time taken for the travel.

Given that the airplane travels for 2.5 hours at an average rate of 130 miles per hour, we can substitute these values into the formula. The rate of the airplane is 130 miles per hour, and the time taken is 2.5 hours.

Using the formula, we can calculate the distance traveled as follows:

d = rt

d = 130 mph × 2.5 hours

Multiplying the rate (130 mph) by the time (2.5 hours) gives us:

d = 325 miles

Therefore, the airplane travels a distance of 325 miles during the 2.5 hours of travel at an average rate of 130 miles per hour.

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Answer:

S = V0 t + 1/2 a t^2   standard equation

Where S is the distance traveled and V0 the initial speed

Answer:

2. 8.62×10² Nm

3. 2.30×10² Nm

4. 6.32×10² Nm

Explanation:

2. Determination of the work done by the applied force.

Force (F) = 225 N

Distance (d) = 5 m

Angle (θ) = 40°

Workdone (Wd) =?

Wd = Fd × Cos θ

Wd = 225 × 5 × Cos 40

Wd = 8.62×10² Nm

3. Determination of the work done by the frictional force.

Frictional Force (Fբ) = 60 N

Distance (d) = 5 m

Angle (θ) = 40°

Workdone (Wd) =?

Wd = Fբd × Cos θ

Wd = 60 × 5 × Cos 40

Wd = 2.30×10² Nm

4. Determination of the net work done.

We'll begin by calculating the net force acting on the crate

Force applied (F) = 225 N

Frictional Force (Fբ) = 60 N

Net force (Fₙ) =?

Fₙ = F – Fբ

Fₙ = 225 – 60

Fₙ = 165 N

Finally, we shall determine the net Workdone. This can be obtained as follow:

Net force (Fₙ) = 165 N

Distance (d) = 5 m

Angle (θ) = 40°

Workdone (Wd) =?

Wd = Fₙd × Cos θ

Wd = 165 × 5 × Cos 40

Wd = 6.32×10² Nm

Answer:

0.531m

Explanation:

Soln

Mass = 3.2kg

Kinetic energy = 8 J

Mechanical energy = 25 J

Recall,

Mechanical energy = K.E + P.E

But P.E = mass × g × h

where g = acceleration due to gravity = 10ms² and h = height.

Mechanical energy = K.E + mass × g × h

25 = 8 + 3.2×10×h

25 - 8 = 32×h

17 = 32×h

divide both sides by 32

17/32 = h

h = 0.531 metres.

Answer:

the answer is true Induction charging is a method used to charge an object without actually touching the object to any other charged object.

Explanation:

Answer:

yes Compression and rarefaction are commonly used with longitudinal waves. And Crests and trough are commonly used with transverse waves!

Explanation:

Answer:

a.  Frequency is 5.45 x 10^14 hz

b.   The period = 1.8 x 10^-15 sec  {or 1.8 femptoseconds]

Explanation:

The velocity of an electromagnetic wave is given by the product of the wave's frequency(f) times its wavelength(λ).  

V = λ f     where,

V is the wave speed,

f is the wave frequency,

λ is the wavelength.

To find frequency, rearrange to:

f = V/ λ

Light travels at 3.00x10^8 m/sec.

λ is 5.50 x 10^-7 m

f = (3.00x10^8 m/sec)/(5.50 x 10^-7 m)  meters cancels, secs is on the bottom]

f = (3.00/5.50)*(10^15)  [The base 10 exponent on the bottom ius subtracted from the one on top:  98-(-7)) = 15)  

f = 0.545 x 10^15 1/s or hz

f = 5.45 x 10^14 hz

b.  The period of a wave is the inverse of it's frequesncy.  It is the time it takes for 1 wave to pass.  Invert the frequency:

 Period = 1/f

  Period =  1/(0.545 x 10^15 1/s)

Period = 1.8 x 10^-15 sec  {or 1.8 femptoseconds]

The 45 kg weight is transported from 2 m to 18 m on the moon, changing its gravitational potential energy by 1,377.6 J.

The formula for gravitational potential energy is-

ΔU = mgh

Plugging in the given values, we get:

ΔU = (45 kg) × (1.62 m/s²) × (18 m - 2 m)

ΔU = 1,377.6 J

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Answer:

products

Explanation:

Answer: what is it in

Explanation:

The acceleration of the particle at time 3 sec is 8 m/s².

The acceleration of the particle is the change in velocity of the particle with time and it is calculated as follows;

a = dv/dt

where;

v = dx/dt

where;

v (x) = d (7t + 4t² )/ dt = 7 + 8t

v (y) = d (5t)/dt = 5

The acceleration of the particle at time 3 sec is calculated as;

a (x ) = dv(x) / dt = d (7 + 8t) / dt = 8

a (y) = dv(y) / dt = d (5) / dt = 0

Hence, a = 8 m/s²

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The two  corresponding resonance distances  would be:

Resonance distances refer to the lengths of the air column in a resonance tube that result in resonance. Resonance occurs when the pressure variations at the two ends of the air column are in phase, which means that the distance between the two pressure nodes must be equal to an integer multiple of one-quarter wavelength (i.e., one-quarter of the wavelength of the sound wave). The length of the air column that results in resonance is referred to as a resonance distance. When the air column is at a resonance distance, it acts as a standing wave, with both pressure and velocity antinodes at the open end of the tube and pressure nodes and velocity antinodes at the closed end. The resonance distances can be used to calculate the speed of sound in the gas filling the tube.

For the first resonance, where the length of the air column is 18.8 cm, the distance between the pressure nodes must be equal to one-quarter of the wavelength of the sound wave at a frequency of 440 Hz:

(1/4)λ = 18.8 cm

Knowing the frequency and wavelength, the speed of sound in air can be calculated:

v = fλ

Substituting the values for frequency and wavelength:

v = (440 Hz)(18.8 cm) = 8332 cm/s

For the second resonance, where the length of the air column is 57.3 cm, the distance between the pressure nodes must be equal to three-quarters of the wavelength of the sound wave:

(3/4)λ = 57.3 cm

Solving for wavelength:

λ = (57.3 cm)(4) / 3 = 76 cm

The next resonance distance can be found by adding one-quarter of the wavelength to the previous resonance distance. In this case, the next resonance distance would be:

18.8 cm + (1/4)λ = 18.8 cm + (1/4)(76 cm) = 18.8 cm + 19 cm = 37.8 cm

If the tube were filled with a gas in which the speed of sound is 264 m/s, the wavelength of the 440 Hz sound wave would be:

λ = v / f = (264 m/s) / (440 Hz) = 0.6 m

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Answer:

0.5s

Explanation:

Given parameters:

Mass of the complex  = 4 x 10kg

Distance moved  = 6.5m

Work done  = 2.6 x 10¹J

Power  = 5.7 x 10W

Unknown:

Time taken  = ?

Solution:

Power is the rate at which work is done.

  Power  = \(\frac{work done}{time}\)

  work done  = power x time

        time  = \(\frac{work done }{power}\)

  Insert the parameters;

       time  = \(\frac{260}{570}\)   = 0.5s

Answer:

This example of the effect of volume on the pressure of a given amount of a confined gas is true in general. Decreasing the volume of a contained gas will increase its pressure, and increasing its volume will decrease its pressure.

Explanation:

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