Train cars are coupled together by being bumped into one another. Suppose two loaded train cars are moving toward one another, the first having a mass of 138000 kg and a velocity of 0.288 m/s, and the second having a mass of 123000 kg and a velocity of -0.131 m/s. (The minus indicates direction of motion.) What is their final velocity

The statement which violates the First Law of Motion is: C. The speed of an object changes even though no forces act on the object.

Newton's First Law of Motion is also referred to as Law of Inertia and it states that an object (physical body) in motion would continue in its state of motion at continuous velocity (in the same speed and direction) or if at rest, it will remain at rest unless it is acted upon by an external force.

This ultimately implies that, it describes the tendency of an object (physical body) to continue in its state of motion or remain at rest, unless when acted upon by an external force.

In conclusion, we can deduce that a violation of the First Law of Motion is the speed of an object (physical body) changes even though no forces act on the object.

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cause there's no gravity therefore they appear weightless

Answer:

hope this helps

Explanation:

Of the three phases of matter (gas, liquid, and solid), sound waves travel the slowest through gases, faster through liquids, and fastest through solids

so your answer would be B.

Answer:

it have to be a

Explanation:

The tangent of the angle at which the items slide equals the coefficient of static friction. The measurement of k can be done in a similar way. To accomplish it, push the upper object while angling it upward. The tangent of that angle equals k when the upper object slides along at a constant speed.

Why is the coefficient of static friction determined using an incline?

By calculating the angle at which the force of gravity overcomes the static friction, you can utilize an item that is inclined to calculate the static coefficient of friction.

How can you tell which way static friction is prevailing?

Static friction pushes in the direction you're trying to travel when you walk (see Figure 2 below). In the absence of friction, the foot would slip backwards as it presses on the ground (like walking on ice).

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The wavelength of a wave is the distance between two consecutive points on the wave that are in phase.

The wavelength is the distance between two consecutive nodes or two consecutive antinodes.

The first harmonious wavelength on a rope is given by the equation

λ = 2L/ n

where λ is the wavelength, L is the length of the rope, and n is the harmonious number. For the first harmonious, n = 1.

In this case, the length of the rope is L = 4m. Substituting into the equation over, we get

λ = 2( 4m)/ 1

λ = 8m

thus, the first harmonious wavelength on the rope is 8 measures.

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The difference in mass between the smaller nuclei that fuse together and the newly formed heavier nucleus, called mass defect.

A tangible body's mass is the amount of matter it possesses. It's also a metric of inertial, or the resistance to velocity when a net force is exerted.

When two small, light nuclei collide and fuse to form a larger nucleus, this is known as nuclear fusion.

One helium nucleus has a mass that is less than the sum of four hydrogen nuclei.

The missing mass, also known as a mass defect, is transformed to energy and radiates outward.

Thus, the difference in mass between the smaller nuclei that fuse together and the newly formed heavier nucleus, called mass defect.

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According to Freud's theory of psychosexual development, identification refers to a process in which a child models their behavior, attitudes, and personality characteristics after someone of the same sex, usually a parent or caregiver.

In other words, the child identifies with and internalizes the traits and values of the person they see as a role model. Identification plays a crucial role in the formation of gender identity, as the child learns what it means to be a boy or girl based on the behaviors and attitudes they observe from their same-sex parent or caregiver.

This process is believed to occur during the phallic stage of psychosexual development, which occurs between the ages of 3 and 6 years old.During this stage, the child's focus is on their genitalia and they begin to develop a sense of gender identity.

They also experience the Oedipus or Electra complex, which is a desire to possess the opposite-sex parent and a fear of retaliation from the same-sex parent. The child resolves this conflict by identifying with the same-sex parent and adopting their gender role as their own.

This process is essential for the child's development of a healthy sense of self and their ability to navigate relationships with others.

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Answer:

The coefficient of the blank is 2

Explanation:

The balanced equation is Mg + 2HCl -> MgCl2 + H2 .

Answer:

Mg + 2HCl  → MgCl2 + H2

Explanation:

The net force on particle q2 can be calculated by finding the net electric force acting on it. The net electric force acting on a particle is the vector sum of the forces exerted by all the other charges on it.

The electric force between two charges q1 and q2 is given by Coulomb's law: F = k * (q1 * q2)/r^2, where k is Coulomb's constant, q1 and q2 are the charges, and r is the distance between them.

The force on particle q2 due to q1 will be:

F1 = k * (q1 * q2) / (0.980m)^2

The force on particle q2 due to q3 will be:

F2 = k * (q2 * q3) / (0.750m)^2

The net force acting on q2 will be the vector sum of F1 and F2.

Keep in mind, q1 and q3 have opposite charges, so they attract each other, while q2 has the same charge as q1, so they repel each other.

Note: The unit of charge is Coulomb (C), but in this problem you are given the charges in microCoulomb (uC) so you need to convert it to Coulomb.

Answer:

Technology is the application of scientific knowledge to the practical aims of human life or, as it is sometimes phrased, to the change and manipulation of the human environment.

Please Mark it as brainlist answer.

Answer:

Los datos que tienes son:

m = 13 kg

d = 46 m

∪ = 0,45

g = 9,8 m/s²

Fr = ? 

w = ? 

Lo primero que haremos que calcular Fr

Fr = ∪mg

Fr = (0,45) (13 kg) (9,8 m/s²)

Fr = 57,33 N

Calculamos el trabajo realizado.

w = Fd

w = (57,33 N) (46 m)

w = 2637,18 Joules

Respuesta.

El trabajo realizado es 2637,18 Joules

Explanation:

To calculate the number of photons produced by the carbon dioxide laser, we need to use the formula relating the energy of a photon to its frequency or wavelength.

The formula is: E = hf = hc/λ, where E is the energy of the photon, h is Planck's constant (6.626 × 10^-34 J s), f is the frequency, c is the speed of light (3 × 10^8 m/s), and λ is the wavelength. First, we need to calculate the energy of one photon with a wavelength of 10.6 μm: E = hc/λ = (6.626 × 10^-34 J s) × (3 × 10^8 m/s) / (10.6 × 10^-6 m) = 1.862 × 10^-20 J. Next, we need to calculate the total energy produced by the laser in 1.00 ms: Energy = Power × Time = 9.50 MW × 1.00 × 10^-3 s = 9.50 × 10^3 J. Finally, we can calculate the number of photons produced by dividing the total energy by the energy of one photon: Number of photons = Energy / E = (9.50 × 10^3 J) / (1.862 × 10^-20 J) = 5.098 × 10^23 photons. Therefore, the carbon dioxide laser produced 5.098 × 10^23 photons when it emitted infrared radiation with a wavelength of 10.6 μm and a power of 9.50 MW for 1.00 ms.

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Answer: search engine optimization

Explanation:

Answer: slower in the air than in water

Explanation: in water, the particles are much closer together, and they can quickly transmit vibration energy from one particle to the next. this means that the sound wave travels four times faster than in air, but it takes a lot of energy to start vibration. a faint sound in the air wouldn't

be transmitted in water as the wave wouldn't have enough power to force the water particles to move.

Answer:

The answer is c

Explanation:

i had the same question and you have to believe me and if you don't that will be on you

Answer:

3600N

Explanation:

Given: m = 1200kg, Vo = 0m/s, Vf = 30m/s, Δt = 10s

ΣF = ma

we need to find 'a' first, using the definition of 'a' we get equation:

a = (Vf-Vo)/Δt

a = (30m/s)/10s

a = 3 m/s^2

now substitute into top equation

ΣF = ma

Fengine = (1200kg)(3m/s^2)

Fengine = 3600N

Answer:

P = 54000 W or P = 54 kW

Explanation:

P = Work/time

W = Force * distance

first, find acceleration to find net force using kinematics.

v = vo + at

30 = 0 + a(10)

a = 3 m/s^2

Fnet = ma = 1200(3) = 3600N = Force

Next, find the distance traveled using kinematics.

∆x = vo(t) + 1/2at^2

∆x = 0(10) + 1/2(3)10^2

∆x = 150 m

Now use the force and distance you just calculated to find the work done.

W = Force*distance

W = 3600N * 150m

W = 540000

Calculate power.

P = W/t

P = 540000/10

P = 54000 W

or

P = 54 kW

The mass would stay the same, but the weight would be only 16.5%.

Explanation:

Mass is the amount of "matter" in an object, which stays the same everywhere. Weight is the force acting on an object by gravity, which changes depending on nearby bodies. In this case, weight on the moon is 16.5% of that on Earth.

Ten devices that use batteries are: smartphones, laptops, flashlights, digital cameras, portable speakers, electric toothbrushes , remote controls, electric shavers, handheld game consoles, and electronic toys

What are the batteries?

Here are ten devices that use cells or batteries:

Whether or not the cells or batteries used in these devices are the best choice depends on various factors such as the device's power requirements, energy efficiency, cost, and environmental impact.

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The equation governing the voltage drop across a capacitor in an RC (resistor-capacitor) circuit is \(V(t) = V0 * (1 - e^{(-t/RC)})\), where V(t) is the voltage across the capacitor at time t, V0 is the initial voltage, R is the resistance, C is the capacitance, and e is the base of the natural logarithm.

In an RC circuit, when an external voltage is applied, the capacitor starts charging or discharging based on the difference between the externally imposed voltage and the voltage across the capacitor.

The equation mentioned above is derived from Kirchhoff's loop rule and describes the time-dependent behavior of the voltage across the capacitor.
The voltage drop across a capacitor in an RC circuit is governed by the equation \(V(t) = V0 * (1 - e^{(-t/RC)})\), which takes into account the initial voltage, resistance, capacitance, and time.

The externally imposed voltage is accounted for in the initial voltage, V0, in this equation.

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Answer:

hudroelectricity

..........

Answer:

generator, crystal oscillator, alternator are sources of AC current.

Answer:

1 both increase

2. highest to lowest A C D B

3 the kinetic energy is higher in the larger vehicle as they have the same speed

Explanation:

Answer:

20 5/6 sec

Explanation:

To find the solution we divide 5000 by 240

However, when you see a problem, always try to simplify

5000/240=500/24=250/12=125/6

Now the division is much easier

20 5/6 sec

It would take 20.833 seconds for an airplane to fly 5000 meters if it maintains a speed of 240 meters per second.

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.

As given in the problem we have to find out, how long it take an airplane to fly 5000 meters  if it maintains a speed of 240 meters per second,

The total distance covered by the plane = 5000 meters

the speed of the plane = 240 meters/seconds

Time is taken by plane = distance /speed of the plane

                                       = 5000 meters/240 meters/seconds

                                        = 20.833 seconds

Thus, It would take 20.833 seconds for an airplane to fly 5000 meters if it maintains a speed of 240 meters per second.

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Answer:

It takes 0.47 seconds for the OJ to reach the ground.

Explanation:

d = vi*t + (1/2)at^2

(-1.1) = (0)t + (1/2)(-9.8)t^2

-1.1 = -4.9t^2

0.22445 = t^2

0.47s = t

The two capacities in which engine oil is sold are large and small. The large can contain more oil than the small can.

Engine oil is essential for the maintenance and longevity of your vehicle's engine. It is sold in two capacities: large and small. The amount of oil required depends on the engine's size and other factors.Large cans usually contain 5 quarts or more of oil, whereas small cans typically contain 1 quart or less of oil. However, the specific amount of oil in each can may vary depending on the brand and manufacturer. It's important to check your vehicle's owner's manual to determine the correct type and amount of oil to use for your engine. Additionally, always make sure to dispose of used oil properly, as it can be harmful to the environment if not disposed of correctly.

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Answer:

C. oversaturated

Explanation:

Sana nakatulong

Answer:

the answer is A. A school crossing guard raises a stop sign that weigh 10 N

Only the school crossing guard who raises a stop sign that weighs 10 N does the work.

Work done in physics is defined as the dot product of force and displacement caused by it. Mathematically -

W = F.x

W = |F| |x| cos Ф

where Ф is the angle between force and displacement

Given are the various situations from which we have to select the situation in which work is done.

A specific amount of displacement is needed for the work to be done. Similarly, the displacement and the force vectors should not have 90 degree angle between them. If any of this is zero than -

W = F × 0 = F × x × cos(90) = 0

It is only in case A that the guard applies a force equal to the weight of the stop sign and displacement is in the same direction. While in other three cases, either displacement is zero (C) or the angle between displacement and force is 90 degrees (B & D).

Therefore, we can conclude that, only the school crossing guard who raises a stop sign that weighs 10 N does the work.

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