an air track car with a mass off 0.25 kg and velocity of 3.4 m/s to the right collides and couples with a 0.45 kg car moving to the left with a velocity of 3.9 m/s. what is the combined velocity of the cars just after the collision?

Answers

Answer 1

Answer:

Two objects are moving in opposite direction on a straight line. After collision, they stick together and move with common velocity

An Air Track Car With A Mass Off 0.25 Kg And Velocity Of 3.4 M/s To The Right Collides And Couples With
Answer 2

The total momentum of a colliding system is constant always. Therefore, by using this concept, the final velocity of the coupled mass will be 3.7 m/s.

What is momentum ?

Momentum of an object is the ability of an object to bring the force applied to make a maximum displacement. It is the product of its mass and velocity. Momentum is a vector quantity. It have both magnitude and direction.

The momentum in a collision is conserved. Thus total initial momentum is equal to the final momentum. Let m1 and m2 be the colliding masses and the u and v be the initial and final velocity.

Then, m1 u1 + m2u2 = (m1 + m2)v for a coupled mass after collision.

then final velocity v =  ( m1 u1 + m2u2 )/ (m1 + m2)

Apply the given values in the equation as follows:

v = (0.25 kg ×3.4m/s + 0.45 kg× 3.9 m/s)) (0.45 + 0.25) = 3.7 m/s

Therefore, the final velocity of the coupled masses after collision is  3.7 m/s.

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Related Questions


The fundamental measuring unit of Electromagnetism is?

Ampere (electric current)
Volt (electric potential)
Coulomb (electric charge)

Answers

The fundamental measuring unit of electromagnetism is Ampere (electric current.Option 1 is correct.

What is electromegnetism ?

The physical interplay of electric charges, magnetic moments, and the electromagnetic field is known as electromagnetism.

The electromagnetic field can be static, moving slowly, or forming waves. Electromagnetic waves are commonly referred to as light and are subject to optics laws.

The fundamental measuring unit of electromagnetism is Ampere (electric current.Option 1 is correct.

Hence option 1 is correct.

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How does nuclear fusion affect the life cycle of a star?.

Answers

Answer:

As the main sequence star glows, hydrogen in its core is converted into helium by nuclear fusion. When the hydrogen supply in the core begins to run out, and the star is no longer generating heat by nuclear fusion, the core becomes unstable and contracts

Explanation:

Describe the motion of the object in the graph below. *
(A) The object is at rest
(B) The object is accelerating
(C) The object is moving at a constant speed

Answers

the object moving at constant velocity so the answer is c

A box with a total surface area of 1.2 m2 and a wall thickness of 4 cm is made of an insulating material. A 10 W electric heater inside the box maintains the inside temperature at 15 oC above the outside temperature. What is the thermal conductivity of the insulating material in units of kcal/(s oC m)

Answers

For a box with a total surface area of 1.2 m2,  the thermal conductivity of the insulating material is mathematically given as

k=5.29*19^{-6} kcal/(s oC m)

What is the thermal conductivity of the insulating material?

Generally, the equation for the   is mathematically given as

P=Ka dT/L

Therefore

k=10*4*10^{-2}/1.2*1.5

k=5.29*19^{-6} kcal/(s oC m)

In conclusion, the thermal conductivity

k=5.29*19^{-6} kcal/(s oC m)

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How many galaxies similar in size to the milky way would you expect to find, on average, in cubes of that same size? in order to simplify the problem, assume that the total number of galaxies of each type has not changed between then and now.

Answers

We would discover 64 galaxies the size of the Milky Way in a cube that now holds one galaxy the size of the Milky Way.

What is a galaxy?

A galaxy is a massive clump of gas, dust, and billions of stars and their solar systems bound together by gravity.

The first galaxies were discovered in the 17th century by Charles Messier, who had no idea what they were at the time.

Messier, a proficient comet viewer, noticed many more fuzzy objects in the sky that he knew were not comets.

We would discover 64 galaxies the size of the Milky Way in a cube that now holds one galaxy the size of the Milky Way.

Hence there are 64 galaxies similar in size to the milky way.

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if you looked at the frequency spectrums of two friends saying the word dog, would they look the same or different?​

Answers

Answer:

different

Explanation:

everybody have there own way of saying it.

Laptop computers are made with batteries, but they must also be plugged into outlets to charge the batteries. which is true regarding laptops? they run only on alternating current. they run only on direct current. they can run on either direct or alternating current. they do not run on direct or alternating current.

Answers

The true statemement regarding laptops is they can run on either direct or alternating current.

What is direct current source?

This is the type of current that flows only in one direction. The source of this type of current in battery.

What is alternate current source?

This is the type of current that changes direction with time. The source of this type of current is current from outlet.

Thus, the true statemement regarding laptops is they can run on either direct or alternating current.

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Answer:

C

Explanation:

edge 2022

What is the formula for principle of moments ?​

Answers

Answer:

The Principle of Moments states that when a body is balanced, the total clockwise moment about a point equals the total anticlockwise moment about the same point. Moment =force F x perpendicular distance from the pivot d.

if i have 5.6 liters of gas in a piston at a pressure of 1.5 pa and compress the gas until it’s volume is 4.8 L what will the new pressure inside the piston be?

Answers

P1V1 = P2V2
Liters to m3 = divide by 1000 or multiply by 0.001
1.5Pa * 5.6*0.001 m3= P2* 4.8*0.001 m3
0.0084 Pa•m3 = 0.0048 m3• P2
P2= 1.75 Pa

What must be the acceleration of a box that is pushed with 86 N of force and experiences 29 N of friction? The mass of the box is 5 kg.

Answers

Answer:

In mechanics, acceleration is the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities (in that they have magnitude and direction). The orientation of an object's acceleration is given by the orientation of the net force acting on that object. The magnitude of an object's acceleration, as described by Newton's Second Law, is the combined effect of two causes: the net balance of all external forces acting onto that object — magnitude is directly proportional to this net resulting force; that object's mass, depending on the materials out of which it is made — magnitude is inversely proportional to the object's mass.

Explanation:

An electric generator converts kinetic energy into which kind of energy? stored mechanical potential electrical

Answers

Answer:

The generator, in turn, converts the mechanical (kinetic) energy of the rotor to electrical energy. Different types of turbines include steam turbines, combustion (gas) turbines, hydroelectric turbines, and wind turbines.

Answer:

electrical energy ;))

Explanation:

A lightning bolt transfers 6.0 coulombs of charge from a cloud to the ground. In 2.0*10^-3 second. What is the average current during this event.

Answers

Answer:

sup cuh,  i just want the point lol

Explanation: sorry not sorry reases

Astronomers know that dark matter is present in galactic halos because the speeds of orbiting stars _________ far from the center of the galaxy.

Answers

Astronomers know that dark matter is present in galactic halos because the speeds of orbiting stars is constant far from the center of the galaxy.

What is the speed of orbiting stars from center of the galaxy?

The speed of stars is in the range of 1 kpc to 16 kpc from the galactic centre.

These stars move approximately on circular orbits about the galactic centre along with small peculiar velocities.

For most of the stars, the velocities range between 200 km/s to 250 km/s.

The speed of the stars  orbiting stars remains constant far from the center of the galaxy.

Thus, Astronomers know that dark matter is present in galactic halos because the speeds of orbiting stars is constant far from the center of the galaxy.

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2. An electric motor transfers 2003 in 10.0 s. If it then transfers the same amount of energy in 8.0 s, has its
power increased or decreased?

Answers

Answer:

decreased

Explanation:

because it transfered from 10.0s

to 8.0s

The energy emitted from a single photon is 1.68 x 10^-27 Joules. Which of the following is most likely the type of electromagnetic wave that was
emitted?

Answers

limiteds edition oon substartion basiss i dont kkown

Why do perpendicular forces do No work?

Answers

Answer:

The definition of work is:

Force (dot product) distance = work

The dot product of vectors at right angles is zero - so no work can be done if the applied force is at a right angles to direction of motion

How can larger telescopes
give astronomers a more precise picture of the distances to the nearest stars?

Answers

Answer:

Explanation:

"Larger telescopes" generally means larger apertures. This is the part of the telescope which collects the light. The more light collected, the more clear the picture becomes

Which of the statements is true regarding the physical properties of hydrocarbons?
1.All hydrocarbons are liquids.
2.All hydrocarbons are gases.
3.Smaller hydrocarbons have higher boiling points and melting points.
4.Larger hydrocarbons have higher boiling points and melting points.

Answers

Answer:

4 is correct

Explanation:

The more carbons in a hydrocarbon there are the higher the melting point will become.

Which of the following concussion BEST describes the data Kevin collected?
A. Sound travels slower in the denser medium
B. Sound travels faster in the denser medium
C. Velocity of the sound wave does not change in the different media
D. Velocity of the sound wave does not change in the different media but in the frequency

Answers

A. Sound travels slower in the denser medium I think

A group constructed two pendulums of different masses and measured their periods multiple times. Their analysis indicated their two samples were distinguishable. What can you infer from these findings

Answers

What I can infer from these findings is that

The period of a pendulum is equal to 2pi'sqrt(e) The period of a pendulum is proportional to its length.

This is further explained below

What are pendulums?

Generally, A pendulum is simply defined as a body that is held from a point and swings under the effect of gravity.

In conclusion, The length of the pendulum varies, but the time period remains constant due to gravity's acceleration at different locations on Earth.

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CQ

A group constructed two pendulums of different lengths and measured their periods multiple times. Their analysis indicated their two samples were indistinguishable. What can you infer from these findings? The two lengths might have been too similar The period of a pendulum is equal to 2pi'sqrt(e) The period of a pendulum is proportional to its length. The two lengths might have been too different.

Cognitive psychology deals with ____.

a: neutral transmissions
b: behavior influence
c: thoughts

Answers

Answer:

B

Explanation:

Because the main focus of cognitive psychology is on the metal processes that affect behavior

an object is placed 20cm from a converging lens. If the real image is formed 80cm from the object, what is the focal length of the lens?​

Answers

Explanation:

Here,

object distance(u)=20cm

image distance(v)=80cm-20cm=60cm

focal length(f)=?

we know ,

(1/f)=(1/v)+(1/u)

1/f = 1/60 + 1/20

1/f = (1+3)/60

60 =4f

f=15cm

Hi, Can anyone help me? I don't understand.

A car horn has a frequency of 448 Hz when the car is stationary. If the car approaches a stationary recorder at a speed of 19.0 m/s, what frequency does the device record if the temperature is 20°C? What frequency does the device record after the car passes by?

**SHOW CALCULATIONS, PLEASE!

Answers

The frequency recorded by the device after the car passes by at the given speed is 474.27 Hz.

Observed frequency recorded by the device

The frequency recorded by the device is determined by using the following formula for doppler effect.

[tex]f_o = f_s(\frac{v + v_0}{v- v_s} )[/tex]

where;

v is speed of sound at 20°C = 343 m/s
vo is speed of the observer = 0vs is the speed of the sound towards the observer = 19 m/sfs is the source frequencyfo is the observed frequency

[tex]f_o = 448(\frac{343 + 0}{343-19} )\\\\f_0 = 474.27 \ Hz[/tex]

Thus, the frequency recorded by the device after the car passes by at the given speed is 474.27 Hz.

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A charge of 8.4 × 10–4 C moves at an angle of 35° to a magnetic field that has a field strength of 6.7 × 10–3 T.

If the magnetic force is 3.5 × 10–2 N, how fast is the charge moving?

9.1 × 10–5 m/s
1.3 × 10–4 m/s
7.6 × 103 m/s
1.1 × 104 m/s

Answers

Answer:

the correct answer is D

Explanation:

. A cylinder of mass M and radius R is released from rest at the top of an inclined plane. The cylinder rolls without slipping down the incline. The rotational inertia of the cylinder is MR2/2.
Derive an expression for the angular momentum of the cylinder about its center of mass when it has rolled a vertical distance h. Express your answer in terms of M, R, h, and physical constants, as appropriate.

Answers

For a cylinder of mass M and radius R is released from rest at the top of an inclined plane, the expression is mathematically given as

L=MR * √{gh/3}

What is the expression for the angular momentum of the cylinder about its center of mass when it has rolled a vertical distance h.?

Generally, the equation for the angular velocity  is mathematically given as

w=V/R

Therefore

[tex]w=\frac{\sqrt{ugh/3}}{R}[/tex]

In conclusion, at instance of IW, the angular velocity

[tex]L=MR^2/2 * 2\sqrt{gh/3}/R[/tex]

L=MR * √{gh/3}

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Suppose a star has the same apparent brightness as Alpha Centauri A ( 2.7×10−8watt/m2 ) but is located at a distance of 300 light-years. What is its luminosity?

Answers

For  a star that has the same apparent brightness as Alpha Centauri A ( 2.7×10−8watt/m2 is mathematically given as

L=2.7*10^30w

What is its luminosity?

Generally, the equation for the luminosity  is mathematically given as

L=4*\pi^2*b

Therefore

L=4*\pi^2*b

L=4* \pi *(2.83*10^{18})*2.7*10^{-8}

L=2.7*10^30

In conclusion, the luminosity

L=2.7*10^30w

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A person is attracted towards the center of Earth by a 440 N gravitational force. The force with which Earth is attracted toward the person is _____.

Answers

A person is attracted towards the center of Earth by a 440 N gravitational force. The force with which Earth is attracted toward the person is 440 N.

Reason: If you were to consider Newton's third law, it says for every action, there is an equal and opposite reaction. That means if the earth exerts a 440N force on the human, then the human will exert a 440N force on the planet.

p.s. Newton's three laws would be very helpful to know for these sorts of conceptual questions that involve forces

Research indicates that social isolation tends to decrease aggressive behaviors. please select the best answer from the choices provided t f

Answers

The statement "Research indicates that social isolation tends to decrease aggressive behaviors." is a False statement. This is further explained below.

What is social isolation?

Generally,  social isolation is simply defined as a lack of social relationships Some humans experience loneliness as a result of social isolation.

In conclusion,  Social isolation does not to decrease aggressive behaviors or acts of violence.

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Answer:

false

Explanation:


Is the moment of inertia of a body is unique? Give reason to your answer.

Answers

Answer:

The moment of inertia  about a "fixed"  axis is unique.

The moment of inertia of a square is different for an axis that passes perpendicular to the center of the square as opposed to an axis that lies in the plane of the square.

Torque = I * alpha shows that angular acceleration depends on I but not on the angle thru which I rotates     α = ω / t

004 (part 1 of 3) 10.0 points

Two moles of helium gas initially at 410 K
and 0.47 atm are compressed isothermally to
1.34 atm.
Find the final volume of the gas. Assume
that helium behaves as an ideal gas. The
universal gas constant is 8.31451 J/K · mol.

005 (part 2 of 3) 10.0 points
Find the work done by the gas.
Answer in units of kJ.


006 (part 3 of 3) 10.0 points
Find the thermal energy transferred.
Answer in units of kJ.

Answers

The final volume of the gas, work done, and the thermal energy transferred  is mathematically given as

vf=0,0623m^2

W=-4.03KJ

Q=-4.03KJ

What are the final volume of the gas, work done, and the thermal energy transferred?

Generally, the equation for the ideal gas   is mathematically given as

Pv=nRT

Therefore

vf=nRT/P

vf=2*8.314330/1*1.01*10^3

vf=0,0623m^2

In conclusion

vi=nRT/Pi

vi=0.1175m^3

w=pdv

w=2*8.314*330in()0.0623/0.117

W=-4.03KJ

Where

Q=W

Q=-4.03KJ

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