(Please answer my question from second paragraph. The main Q is not the problem for now.)

A train increases its speed steadily from 10 m/s to 20 m/s in 1 minute. (a) What is its average speed during this time, in m/s? (b) How far does it travel while increasing its speed?

My teacher says the answer to (a) is ​​​​​​​​​10m/s
(without using any formulas or explanations, she just makes us choose between 10 or 20m/s.) and for (b) she makes us write down a sentence ​​​I dont recall anymore. I'm wondering if she is correct or not because​​​​​​​​ every answer I found on the internet contradicts her​​​​​​ ​otherwise. ​​​​​

Answer:

the number of protons.

Explanation:

the atomic number is the number of protons in the nucleus of an atom. the number of protons Define the identity of an element.

The net moment is 20N.m (30N.m - 10N.m). (A)

The net moment of the two forces about point P can be found by calculating the moment of each force and adding them together.

Using the CCW direction as positive, the moment of the 10N force is -10N.m and the moment of the 30N force is 30N.m.

To explain further, the moment of a force is the product of the magnitude of the force and the perpendicular distance from the point of rotation (in this case, point P) to the line of action of the force. The direction of the moment is determined by the direction of rotation, with CCW being positive and CW being negative.

In this problem, the 10N force creates a CW moment, so it has a negative sign. The 30N force creates a CCW moment, so it has a positive sign. Adding the moments together gives the net moment, which in this case is positive because the CCW moment is greater than the CW moment.(A)

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The temperature inside will be 413.2K.

T₁=373K

ΔH=40.65kJ/mol

P₁=1atm

P₂=3.6atm

we know that,

ln (P₂/P₁)=ΔH/R(1/T₁-1/T₂)

where,

T₁ is initial temperature

T₂ is final temperature

P₁ is initial pressure

P₂  is final pressure

on substituting value we get

T₂=413.2K

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The heavier elements are not much larger because of the greater electrical attraction by the greater charge in the nucleus. The size of an atom is determined by the charge present at the nucleus of the atom, greater the atomic number, greater is the number of protons in the nucleus.

The distance between the drone and the car will be 20,3 m/s.

In physics, velocity is a quantity that identifies the displacement of a body in a given time. Thus, the average velocity measures in an average time interval, the speed of displacement of a body.

With that being said, Suppose that both car and drone starts from 0 and move towards north and east, respectively. So, after T time:

Distance covered by the car, \(y = 20.T.m\)

Distance cover by the drone, \(x = 6.T.m\)

Considering the elevations of 25m, the actual distance between them at any T instant:

\(A = \sqrt{(20T)^{2} } + (6T)^{2} +25^{2}\)

Speed, \(V = \frac{ds}{dt} = \frac{[2(20T).20+2(6T).8}{\sqrt{(20.5)^{2}+(6T)^{2}+25^{2} } }\)

\(V = 20,3 m/s\)

So, the distance between the drone and the car will be 20,3 m/s.

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Answer:

20.3 m/s

Explanation:

dx / dt = 20 m / s

dy / dt = 6 m / s

dj / dt = ? when t = 5 s

The trick here is that the drone is flying at an elevation of 25 m.

x^2 + y^2 = j^2

Implicit Differentiation: 2x dx / dt + 2y dy / dt = 2j dj / dt

We are not given x and y values. Solve by d = vt. Distance = velocity * time

x = 20(5) = 100 m

y = 6 (5) = 30 m

Now we need to solve for j, but we need to solve the hypotenuse z of the right triangle first.

z = \(\sqrt{(100)^2 + (30)^2\) ≈ 104.4 m

A mistake occurs when z is used as the distance between the drone and the car. Visualize the distance between the drone and the car as the right triangle where j is the hypotenuse, z is the x value, and 25 m is the y value.

j = \(\sqrt{(104.4)^2+(25)^2\) ≈ 107.35 m

dj / dt = 1 / 2(107.35)((4000 + 360)) ≈ 20.3 m/s

Answer: No their are different chargers

No, Norbu cannot use the two thin copper wires to charge his mobile phone by inserting them directly into the socket.

Charging a mobile phone requires a proper charger and cable that are designed to regulate the flow of electricity and provide the appropriate voltage and current to the battery. Inserting copper wires directly into a socket is not only unsafe but also highly likely to result in electric shock, short-circuiting, overheating, or even causing a fire.

Using improper methods to charge electronic devices can lead to irreparable damage to the device, risk to personal safety, and damage to the electrical system. It's crucial to always use the correct and safe charging equipment provided by the manufacturer to ensure the safety of both the device and the user.

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Answer:

the answer is D I THINK

Explanation:

Answer:

3420.39 N

Explanation:

Applying,

Fd = 1/2(mv²-mu²)................. Equation 1

Where F = force on the bumber, d = distance, m = mass of the car, v = final velocity, u = initial velocity.

make F the subject of the equation

F = (mv²-mu²)/2d............... Equation 2

From the question,

Given: m = 890 kg, v = 0 m/s (to rest), u = 1.4 m/s, d = 0.255 m

Substitute these values into equation 2

F = [(890×0²)-(890×1.4²)]/(2×0.255)

F = -1744.4/0.51

F = -3420.39 N

The negative sign denotes that the force in opposite direction to the motion of the car.

Answer:

when waterways are polluted it affects all forms of life in the area - including us

expression:

for example when Lakes streams and ponds are polluted it can kill or harsh fish and other Wildlife that lives there!

hope that helps !

Among the materials listed, air (density 0.001 g/cm³), corn oil (density 0.93 g/cm³), wood (density 0.85 g/cm³), and ice (density 0.92 g/cm³) will float on water (density 1 g/mL).

These materials have lower densities than water, allowing them to be buoyant and remain on the surface. On the other hand, glycerine (density 1.26 g/cm³), corn syrup (density 1.38 g/cm³), steel (density 7.81 g/cm³), and rubber (density 1.34 g/cm³) will sink due to their higher densities compared to water. It is important to note that an object will float in water if its density is less than the density of water and will sink if its density is greater than that of water.

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"Code Talker: The First and Only Memoir by One of the Original Navajo Code Talkers of WWII" is a book written by Chester Nez in collaboration with Judith Schiess Avila. It is an autobiography of the author and his experiences in World War II as a Navajo code talker.

The Navajo Code Talkers were an elite group of Navajo Marines who used their language to develop a code that could not be deciphered by the enemy. The Japanese had broken all American codes, so the Marines wanted to create an unbreakable code. The Navajo language, which had no written form, was the perfect solution. Navajo Code Talkers developed an intricate code that used their language's complex syntax, tonal qualities, and dialects. It proved to be the only code that the Japanese couldn't break.

The Navajo Code Talkers took part in every major Marine operation in the Pacific, from Guadalcanal to Okinawa. Chester Nez, the book's author, was one of the original Navajo Code Talkers. He was born in New Mexico in 1921 and was educated in a boarding school where he was forbidden from speaking his native Navajo language. Chester Nez was a U.S. Marine who was recruited in 1942 and became a part of the Navajo Code Talkers program. He was a member of the 382nd Platoon and served in the Pacific, where he worked as a radio operator.

Code Talker is about the Navajo Code Talkers, the Marine unit that used the Navajo language to develop an unbreakable code that played a crucial role in the U.S. victory over Japan in World War II. The book offers a first-hand account of what it was like to be a Navajo Code Talker during the war, as well as the impact that the code talkers had on the outcome of the war. Chester Nez provides an in-depth look at Navajo culture and history while telling his own personal story of growing up on the Navajo reservation and joining the Marine Corps.

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Answer:

Crown glass. The material which the velocity of light greatest is AIR. Because the speed of light in crown glass is the speed of light in a vacuum divided by the index of refraction of crown glass, which is 1.52. This works out to 1.97 times 10 to the 8 meters per second is the speed of light in crown glass.

The time spent in air by the tuna before it hits the ground is determined as 1.375 seconds.

The time spent in air by an object or a projectile is the total time of motion of the object or projectile.

The time spent in air by the tuna can be determined by finding equation of the final velocity of the tuna when it hits the ground as follows;

h = 16t² + ut

where;

Velocity of the tuna when it hits the ground,

v = dh/dt

dh/dt = 32t + u

when the tuna hits the ground, final velocity = 0

0 = 32t + u

0 = 32t + 44

t = -44/32

|t| = 1.375 seconds

Thus, the time spent in air by the tuna before it hits the ground is determined as 1.375 seconds.

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Mineralogically, barite is a sulfate, bornite is a sulfide, cuprite is an oxide, magnesite is a carbonate.

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Among the mineral groups, barite is a sulfide mineral, bornite is a sulfide mineral, cuprite is an oxide mineral, and magnesite is a carbonate mineral.

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The correct answer is B. Different observers must always agree on the order in which all events happen, but can disagree on whether they happen at the exact same time.

Special relativity, as formulated by Albert Einstein, introduced the concept that the order in which events occur is not absolute but can be relative to different observers.

However, there is a fundamental principle in special relativity known as causality, which states that the order of cause and effect must be preserved.

This means that if one event can causally influence another event, all observers must agree on the order of these causally connected events.

However, special relativity also introduced the concept of relative simultaneity, which means that different observers moving relative to each other can have different perceptions of whether two events happen at the exact same time.

This is due to the relativity of time and the fact that the notion of "simultaneity" depends on the observer's reference frame.

Therefore, different observers can disagree on the simultaneity of events, but they must agree on the overall order in which events happen, especially if they are causally connected.

So, option B is correct: Different observers must always agree on the order in which all events happen, but can disagree on whether they happen at the exact same time.

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Answer:

option B

Explanation:

given,

Satellite B has an orbital radius nine times that of satellite A.

R' = 9 R

now, orbital velocity of the satellite A

........(1)

now, orbital velocity of satellite B

from equation 1

hence, the correct answer is option B

Answer: It represents the whole distance traveled. Hope this helps!

Explanation:

Your answer:

150 kilometer's per hour.

Answer:

Student A is correct.

Explanation:

An electromagnet can be defined as the magnet that is produced by the electric current passing through a wire surrounding a metal piece. In an  electric motor, magnets surrounds the the coil carrying currents. Because of the magnetic field, the current carrying coil experiences a force and it starts to rotate. Thus the electric motors uses the forces between the electromagnets to start running.

Therefore, student A is correct.

Answer:

one that produces sexually and has genetically different offspring

Explanation:

they can adapt to the new enviornment

Answer:

Because the sodium bicarbonate does not separate into sodium, hydrogen, carbon and oxygen

Explanation:

The components of sodium bicarbonate differ in their solubilities in water.baking soda is sodium bicarbonate.

3.375m/s is the final velocity of the car.

The final velocity depends on how large the acceleration is and the distance over which it acts.

Initial velocity of an object, you can multiply the acceleration due to a force by the time the force is applied and add it to the initial velocity to get the final velocity.

According to the question,

A toy car starts from the rest and accelerates

So the acceleration = 1.50m/s²

Time =  2.25s

\(x=x_{0} + vt\)

\(x = 0 + ( 1.50m/s^2*2.25s)\)

\(x = 3.375m/s\)

The final velocity, of the car is 3.375 m/s.

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The angle of projection through which the football is kicked is approximately 72.7 degrees.

We can use the kinematic equations of motion to solve this problem. We know the initial velocity of the football, the height it clears, and the horizontal distance it travels. We can use these values to find the angle of projection.

Let's first find the time it takes for the football to reach the goalpost. We can use the equation:

\(y = viy t + 1/2 at^2\)

where y is the vertical displacement, viy is the vertical component of the initial velocity, a is the acceleration due to gravity, and t is the time.

Plugging in the values, we get:

4 m = (12 m/s)sinθ t - 1/2 (10 m/\(s^2) t^2\)

Simplifying and rearranging, we get a quadratic equation in t:

\(-5t^2 + 24t - 24 = 0\)

Solving for t using the quadratic formula, we get:

t = 2.4 s

Now we can use the horizontal distance and the time to find the initial velocity in the horizontal direction:

x = vix t

9 m = vix (2.4 s)

vix = 3.75 m/s

Finally, we can use the initial velocities in the horizontal and vertical directions to find the angle of projection:

tanθ = viy / vix

θ =\(tan^{(-1)} (viy / vix)\)

θ = \(tan^{(-1)\)[(12 m/s) / (3.75 m/s)]

θ = 72.7 degrees (rounded to one decimal place)

Therefore, the angle of projection through which the football is kicked is approximately 72.7 degrees.

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Answer:

A

Explanation:

just did took quiz

Nuclear power plants provide cheap electricity to power people's

homes the statement that illustrates how engineering has influenced society, therefore the correct option is A.

It is a type of power plant in which the power is generated with the help of a nuclear reactor involving a nuclear which could be either nuclear fission or fusion reaction.

There is an enormous amount of energy generated when a radioactive material goes into a nuclear reaction, this energy is utilized to form steam from the water in the nuclear reactor which is further passed through the turbine to produce the electricity.

As we can see how complex it is to produce electricity from a tiny amount of radioactive material,humanity has come so far to solve complex problems for the betterment of human society.

Science and its application with help of applicative engineering drive the growth of human civilization.

Hence , we can say that nuclear power plants provide cheap electricity to power people's homes the statement that illustrates how engineering has influenced society, therefore the correct option is A.

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The motion of the car in each interval of time are:

Δt(1) from 0 to 30 s and Δx(1) from 0 to 0.02 km

Δt(2) from 30 to 60 s and Δx(2) from 0.02 to 0.02 km

Δt(3) from 60 to 120 s and Δx(3) from 0.02 to 0.04 km  

We know that car has a speed of 2 km/h in 30 seconds, we can use this information to find the distance in this interval of time.

Let's use the definition of speed.

\(v=\frac{\Delta x}{\Delta t}\) (1)

Before finding the distance we need to convert the units of velocity, from km/h to km/s.

\(2\frac{km}{h}*\frac{1\: h}{3600\: s}=5.56*10^{-4}\: km\)

Now we can use the equation (1) and solve it for Δx

\(\Delta x_{1}=v\Delta t\)

\(\Delta x_{1}=5.56*10^{-4}*30\)  

\(\Delta x_{1}=0.02\: km\)

Then, the car stops 30 seconds, and finally, it returns its travel at half its previous speed, which means at 1 km/h.

\(1\frac{km}{h}=2.78*10^{-4}\frac{km}{s}\)

We calculate the final distance using \(t_{3} = 60 s\) because the plot shows this value as the maximum interval of time.

\(\Delta x_{3}=2.78*10^{-4}*60=0.02\: s\)

We can resume all the trajectories in the following list.

Δt(1) from 0 to 30 s and Δx(1) from 0 to 0.02 km

Δt(2) from 30 to 60 s and Δx(2) from 0.02 to 0.02 km

Δt(3) from 60 to 120 s and Δx(3) from 0.02 to 0.04 km  

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When you push a pencil off your desk, the energy transformation that takes place is that potential energy transforms into kinetic energy.

The correct answer to the given question is option C.

Potential energy is the energy stored within an object because of its position or configuration.

In this scenario, the pencil has potential energy because of its elevated position on the desk. When the pencil is pushed off the desk, it begins to move, which means that it has kinetic energy. Kinetic energy is the energy of motion.

As the pencil falls off the desk, its potential energy is transformed into kinetic energy, which is the energy that results from its motion. The faster the pencil falls, the greater its kinetic energy will be because kinetic energy is directly proportional to the square of an object's velocity.

Therefore, when you push a pencil off your desk, the potential energy that it has because of its elevated position is transformed into kinetic energy as it falls towards the ground.

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The speed of the snowball before Maya caught it was 104 m/s.

According to the law of conservation of momentum, the sum of the initial momenta will be equal to the sum of the final momenta.

Mass of Max = 15 kg

Mass of Maya = 12 kg

Mass of Snowball = 1.5 kg

Now, using the law of conservation of momentum, we have

The momentum of Max + Momentum of Snowball = Momentum of Maya + Momentum of Snowball

Initial Momentum of Max = 0 (as Max is standing on the shore)

The momentum of Snowball = mv (where m is the mass of the snowball and v is the velocity of the snowball)

The momentum of Maya = mv (where m is the mass of Maya and v is the velocity of Maya with snowball)

Final Momentum of Snowball = (m + m) × v

Now putting these values, Initial momentum = 0 + 1.5 × vi = 1.5vi

Final momentum = 15 × u + 12 (2 u) = 39u (where u is the velocity of Maya with snowball after catching)

Initial Momentum = Final Momentum 1.5vi = 39u

We can write u = 2m/s

Thus putting the value of u, we can calculate the initial velocity of the snowball.

vi = u × (39 / 1.5) = 104 m/s

Thus, the speed of the snowball before Maya caught it was 104 m/s.

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The maximum height travelled by the ball before returning to the ground is 8.62 m.

The maximum height travelled by the ball before returning to the ground is calculated by applying the following kinematic equation as shown below.

H = (u²sin²θ) / 2g

where;

H = (26² (sin 30)²) / (2 x 9.8)

H = 8.62 m

Thus, the maximum height travelled by a projectile depends on the initial velocity and angle of projection.

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The rotational speed of the motor 3 in rpm. b. 92

The figure shows a hydraulic circuit that uses three chain conveyors. The torque that drives the motors is T: =1500 N.m. T2 =700 Nm and, T3 = 300Nm.The volumetric flow rate produced by the pump is 6.3 liters per minute. The displacement volume of the motors is V01 =1000 cm3/rev. V02 =1000 cm3/rev and, V09 =500 cm3/rex.

The motors have a volumetric efficiency of 0.9 and an overall efficiency of 0.85. The leakage of hydraulic motors 1 and 3 is internal completely, while the leakage of hydraulic motor 2 is external completely.The orifice of the flow control valve has a diameter of 0.5 mm. The capacity coefficient of the needle valve is 0.7.

The pressure losses through the pipes are ignored. The volumetric flow rate through the needle valve is Q = C × A2 × ΔP / ρ where C is the capacity coefficient, A is the area of the orifice, ΔP is the pressure difference through the needle valve, and ρ is the density of the fluid. The density of the oil used in the hydraulic system is 860 kg/m3. We need to determine the rotational speed of motor 3 in rpm.

So,Let’s first determine the volumetric flow rate required by hydraulic motor 3. Using the expression of volumetric flow rate through the needle valve, we have Q = C × A2 × ΔP / ρ… (i)We are given that the capacity coefficient of the needle valve is 0.7. Its orifice diameter is 0.5 mm.

Hence, the area of the orifice is given byA2 = π d2 / 4where d is the diameter of the orifice. So, A2 = π × (0.5 mm)2 / 4 = 0.196 mm2 = 1.96 × 10-7 m2Using equation (i), we haveQ = C × A2 × ΔP / ρNow, we will calculate ΔP. To do this, we need to determine the flow rates Q1, Q2, and Q3.Let Q’ be the total volumetric flow rate through the system.

Since the overall efficiency of the system is given as 0.85, we haveQ’ = 0.85 × 6.3 l/min = 5.355 l/min = 5.355 × 10-3 m3/minWe know that the volume of fluid passing through the hydraulic motors is equal to their displacement volume multiplied by the number of revolutions per unit time.So, we haveQ1 = V01 × n1 … (ii)Q2 = V02 × n2 … (iii)Q3 = V03 × n3 … (iv)where V01, V02, and V03 are the displacement volumes of hydraulic motors 1, 2, and 3, respectively.

We are given that V01 = V02 = 1000 cm3/rev and V03 = 500 cm3/rev, which gives V01 = V02 = 1 × 10-6 m3/rev and V03 = 0.5 × 10-6 m3/rev.Substituting equations (ii), (iii), and (iv) in equation (i), we haveQ = C × A2 × (Q1 + Q2 - Q3) / ρSolving for Q3, we getQ3 = (Q1 + Q2 - Q) / C × A2 × ρPutting the given values in the above expression, we haveQ1 = V01 × n1 = (1 × 10-6 m3/rev) × n1Q2 = V02 × n2 = (1 × 10-6 m3/rev) × n2Q3 = V03 × n3 = (0.5 × 10-6 m3/rev) × n3Q = 5.355 × 10-3 m3/min = 5.355 × 10-3 / 60 m3/s = 8.925 × 10-5 m3/sA2 = 1.96 × 10-7 m2C = 0.7ρ = 860 kg/m3

Substituting the above values, we get8.925 × 10-5 = (1 × 10-6 × n1 + 1 × 10-6 × n2 - 0.5 × 10-6 × n3) / (0.7 × 1.96 × 10-7 × 860)Solving for n3, we have n3 = 91.6 rpmSo, the correct option is b. 92.

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Answer:A 1000 kg car and a 2000 kg truck have the same momentum when the car is travelling at twice the speed of the truck, i.e. 38 m/s.

When a 1000kg car and a 2000kg truck have the same momentum, the speed of 1000 kg car is twice that of the  2000kg truck.

The product of a particle's mass and velocity is its momentum. Being a vector quantity, momentum possesses both magnitude and direction. According to Isaac Newton's second equation of motion, the force applied on a particle is equal to the time rate of change of momentum.

As  a 1000kg car and a 2000kg truck have the same momentum,

1000 kg × v₁ = 2000 kg × v₂

v₁ = 2v₂

Hence, the speed of 1000 kg car is twice that of the  2000kg truck.

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