A car accelerates from a velocity of 20 m/s in 5 seconds. What is the initial velocity of the car

Invariance principles and conservation laws are connected by Noether's theorem. Invariance is the quality of something that remains the same regardless of change. In mathematical physics, this refers to a scenario where physical laws or properties remain unchanged under some specified transformation.

The Lagrangian is a mathematical model used to derive the equations of motion of a system of particles or fields. The theory of rotational invariance states that the Lagrangian is unchanged under rotations about a particular symmetry axis.Suppose that the Lagrangian of an N-particle system is unchanged by rotations about a certain symmetry axis.

Without loss of generality, let this axis be the z-axis. We need to show that the Lagrangian is unchanged when all the particles (labelled by a) are moved simultaneously from (ra,θα,Pa) to (Ta,θα,φα+e).For a single particle, the Lagrangian L does not change under rotation, as long as the motion is confined to a plane.

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Answer:

\(\huge\boxed{\sf F= 350 \ N}\)

Explanation:

Considering pivot as the central point,

Key:

\(F_1r_1=F_2r_2\)

Here,

Substitute the givens in the above formula.

\(F(1.2)=600(0.7)\\\\F(1.2)=420\\\\Divide \ 1.2 \ to \ both \ sides\\\\F=420/1.2\\\\F= 350 \ N\\\\\rule[225]{225}{2}\)

Answer:

A. a total solar eclipse

Explanation:

During a solar eclipse,the moon comes between the sun and Earth, casting its shadow over the Earth

Answer:

sound waves

Explanation:

sound waves are mechanical waves that need a medium like air to propagate throuh

The charge to mass ratio of the electron (in 10^11 C/kg) can be determined by using the formula below, where e is the charge on an electron, and m is its mass:`e/m`

We can substitute the given charge of an electron as follows:`e = -1.60x10^-19 C`The mass of an electron is given by `9.11x10^-31 kg`.Therefore, the charge to mass ratio of the electron can be found as shown:`(-1.60x10^-19 C) / (9.11x10^-31 kg)`Multiplying by `10^11 C/kg` on both the numerator and the denominator:`= (-1.60x10^-19 C / 9.11x10^-31 kg) x (10^11 C/kg / 10^11 C/kg)`Simplifying:`= (-1.60 / 9.11) x 10^-8 (10^11 C/kg)`Therefore, the charge to mass ratio of the electron is:`= -0.175 x 10^3 C/kg = -1.75 x 10^11 C/kg.Given that the charge of an electron is -1.60x10^-19 C, we can find the charge to mass ratio of an electron by using the formula `e/m` where e is the charge of an electron and m is its mass.

To solve for the charge to mass ratio of the electron, we substitute the given values of e and m into the equation:`e/m = (-1.60x10^-19 C) / (9.11x10^-31 kg)`This simplifies to:`= -1.75 x 10^11 C/kg`Therefore, the charge to mass ratio of the electron is -1.75 x 10^11 C/kg.

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Answer:

721.5 N

Explanation:

F= m X a            F=8.18 kg x 88.2 m/s²    =  721.5 N

not sure if this is correct just guessing

721.5 N

F= m X    F=8.18 kg x 88.2 m/s²    =  721.5 N

To reduce the speed slow down and decelerate a car. 2: to decrease the rate of progress of decelerate growth decelerate soil erosion. intransitive verb. : to move at decreasing speed.

Deceleration is a slowing down: the unexpected deceleration of your car might mean that you've run out of gas. Use the noun deceleration when you talk about a gradual decrease in speed.

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Answer:

chemical changes

burning wood

rotting banana

fireworks

physical changes

shredding paper

melting ice

chopping wood

Explanation:

Answer:

3.33 A

Explanation:

Equalent Resistance=30 ohms

I = V / R

I = 100 / 30

I = 3.33 A

   Liquids are pourable because they do not maintain a "solid" structure as solids do, but still have structure, unlike gasses. Why is this? The forces between liquid particles are weaker than the forces between solid particles. The particles are further apart and move around more easily.

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- Heather

The shear stress distribution at the cross-section can be determined by calculating the shear stress at various points along the beam and plotting them accordingly.

To determine the absolute maximum shear stress in a simply supported beam and sketch the shear stress distribution at the cross-section, we need more information regarding the specific loading and cross-section of the beam. Without those details or the provided figure, it is not possible to provide an accurate calculation or sketch. However, I can explain the general concept of shear stress in a beam and the factors that influence it.

Shear stress is a measure of the intensity of internal forces that act parallel to a plane in a material. In a simply supported beam, shear stress arises due to the shear force applied to the cross-section of the beam. The magnitude of shear stress depends on the magnitude of the shear force and the cross-sectional properties of the beam.

To calculate the absolute maximum shear stress in a beam, one typically needs to consider various loading conditions, such as point loads, distributed loads, or concentrated moments. The cross-sectional properties, including the shape, dimensions, and material properties of the beam, also play a crucial role in determining the shear stress distribution.

Additionally, the type of loading (uniform, concentrated, or varying) and the support conditions (simply supported, fixed, or cantilever) influence the distribution of shear stress.

Once the loading and cross-sectional details are provided, it is possible to calculate the shear force at any location along the beam and determine the corresponding shear stress using principles of mechanics of materials, such as the shear stress formula:

τ = VQ / (Ib)

Where:

τ is the shear stress

V is the shear force

Q is the first moment of the area

I is the moment of inertia of the cross-section

b is the width of the beam

The shear stress distribution at the cross-section can be determined by calculating the shear stress at various points along the beam and plotting them accordingly.

In summary, to accurately calculate the absolute maximum shear stress and sketch the shear stress distribution in a simply supported beam, we need specific information about the loading conditions and the cross-sectional properties of the beam.

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Answer:

fn /2 .3 'in

Explanation:

The velocity at impact will be (-10) m/s if all forces acting on the spacecraft (weight, drag, and thrust) are included.

To find the velocity at impact, first, we need to consider all the forces acting on the spacecraft (weight, drag, and thrust). Then, we can use these forces to find the net force and acceleration. Finally, we can calculate the impact velocity.

Step 1: Calculate the weight of the spacecraft:-
Weight = mass × gravitational acceleration
Weight = 2060 kg × 3.7 m/s² = 7618 N

Step 2: Calculate the net force acting on the spacecraft:-
Net force = thrust - drag - weight
Net force = 4810 N - 7500 N - 7618 N = -10308 N

Step 3: Calculate the acceleration of the spacecraft:-
Acceleration = net force/mass
Acceleration = -10308 N / 2060 kg = -5 m/s²

Step 4: Calculate the velocity at impact:-
We know that the initial velocity is 40 m/s, and the propellant burns for 10 seconds. We can use the equation of motion (v = u + at) to find the final velocity:-
Final velocity(v) = initial velocity(u) + acceleration(a) × time(t)
Final velocity = 40 m/s + (-5 m/s²) × 10 s = 40 m/s - 50 m/s = -10 m/s

Therefore, the velocity at impact will be -10 m/s (the negative sign indicates that the velocity is in the opposite direction to the initial velocity).

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Answer:D

Explanation:

Because u have to make observation then ask a question

Answer:

p = 50 kg·m/s

Explanation:

attached is a good way to remember the formula!

The average speed of the car for the entire trip is 80 km/h.

The total distance travelled is the sum of the distances travelled in the two legs of the trip, and the total time taken is the sum of the times taken in each leg.

In the first leg of the trip, the car travels 200 km in 2.5 hours. Therefore, its speed in this leg is:

\(v1=d1/t1=200 km/2.5 hours = 80km/h\)

During the 0.5-hour rest stop, the car does not travel any distance, so we can ignore this time period when calculating the average speed.

In the second leg of the trip, the car travels another 200 km, this time in 2 hours. Therefore, its speed in this leg is:

\(v2=d2/t2 = 200km/2hours = 100km/h\)

The total distance travelled is 200 km + 200 km = 400 km, and the total time taken is 2.5 hours + 0.5 hours + 2 hours = 5 hours. Therefore, the average speed of the car for the entire trip is:

average speed = total distance / total time = 400 km / 5 hours = 80 km/h

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The effect of the distance of a launcher affects the speed of a car in that an optimum distance is desirable for optimal performance.

If the distance is too small the speed of the car will be minimal, also of the distance is too large, the speed of the car will be small also.

Hence, the speed is optima only when we have an optima distance in between.

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While it's important to exercise caution and be mindful of other drivers, it is not necessary to come to a complete stop when entering a highway without stop or yield signs. Safe and efficient merging can be achieved by using acceleration lanes and properly gauging the traffic flow.

While it is important to prioritize safety when entering a highway, it is not necessary to come to a complete stop if there are no stop or yield signs present. In fact, coming to a complete stop when entering a highway without such signs can be dangerous and disrupt the flow of traffic.

Highways are designed for higher speeds, and drivers merging onto the highway need to match the speed of the ongoing traffic to ensure a smooth and safe merge. Coming to a complete stop unnecessarily can confuse other drivers and increase the risk of rear-end collisions.

Instead of stopping, it is recommended to use the acceleration lane or on-ramp to gradually increase speed and merge into the flow of traffic. It's essential to signal your intentions, check your mirrors, and find a suitable gap in the traffic to merge smoothly.

In conclusion, while it's important to exercise caution and be mindful of other drivers, it is not necessary to come to a complete stop when entering a highway without stop or yield signs. Safe and efficient merging can be achieved by using acceleration lanes and properly gauging the traffic flow.

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Answer:

Table tennis and tennis

Explanation:

Tennis and table tennis.

While two of them have tennis in their names, they're actually both different and very well so.

Tennis is a bigger version of table tennis that takes place on a land. It's usually played in a court, outside, or even inside some sports center.

On the other hand, table tennis is a "low level tennis". It takes place on a table, like its name implies, it is played in a table. Table tennis is usually played for a shorter when compared with tennis but they have a lot of things in common

Explanation:

Average Velocity = Displacement / Time

= 1.2km / 5 min

= 1200m / 300s

= 4m/s.

The average velocity of a moving body is the distance covered by time. The average velocity of the traveler covers 1.2 km in 5 min is 4 m/s.

Velocity is a physical quantity which measures the distance travelled per unit time. Velocity is a vector quantity thus having both magnitude and direction.

Velocity is the ratio of distance to the time. Given that the distance travelled by the man = 1.2 km = 1200 m

time = 5 min = (5 × 60 s) = 300 s.

Thus, velocity = distance/ time

                       = 1200 m / 300 s

                       = 4 m/s.

Therefore, the velocity of the traveler is  4 m/s.

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According to the visible spectrum, we can deduce the following:

Light can be defined as a form of electromagnetic waves (radiation) that do not require any medium for its propagation. Thus, light is generally referred to as a visual signal because it can be seen with the eyes.

Based on scientific records, the wavelengths of light that can be seen by humans with their eyes is between the range of 400 to 750 nanometers (nm).

According to the visible spectrum, we can deduce the following:

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Answer:

B

Explanation:

The cochlea is the part of the inner ear involved in hearing. It is a spiral-shaped cavity in the bony labyrinth, in humans making 2.75 turns around its axis, the modiolus.

Answer:

the answer is the cochlea

Explanation:

the eardrum receives the sounds and the cochlea "decifers them" so you know what words people are saying or what sound is playing.

Answer:

B. Convection.

Explanation:

Convection is an energy transfer process which typically involves the transfer of heat as a result of the movement of mass. Convection is generally considered to be a more effective and efficient means of heat transport in the Earth when compared to conduction. The movement of tectonic plates is caused by the convection current because the heat gains pressure underneath the crust.

Hence, the type of energy transfer which is responsible for the movement of magma in Earth's interior is convection.

Additionally, subduction zone is a zone which represents the collision between the two (2) tectonic plates of planet earth. Subduction zone occurs in countries such as Japan, Canada, Indonesia, Russia, Alaska, and around the Pacific Ocean.

Generally, subduction zones are responsible for high intensity earthquakes, volcanoes and tsunamis around the world.

Nuclear cross section measures the likelihood of interaction between a projectile particle and a target nucleus. The cross section generally decreases with increasing velocity of the incident particle due to reduced interaction time and penetration depth.

In nuclear physics, the nuclear cross section is a measure of the likelihood of an interaction occurring between a projectile particle (such as a proton or neutron) and a target nucleus. It represents the effective area that the target nucleus presents to the projectile particle.

The nuclear cross section can vary with the velocity of the incident proton or neutron. At higher velocities, the cross section generally decreases. This is because at higher velocities, the projectile particle spends less time interacting with the target nucleus, leading to a lower probability of interaction. As the velocity increases, the projectile particle can penetrate deeper into the target nucleus before interacting, resulting in a smaller effective area and hence a smaller cross section.

The variation of nuclear cross section with velocity is influenced by factors such as the nuclear forces, the energy of the incident particle, and the properties of the target nucleus. At extremely high velocities, the nuclear cross section may exhibit resonances or other complex behaviors due to specific energy levels or interactions between the projectile and target nucleus.

Understanding the variation of nuclear cross section with velocity is crucial for applications such as nuclear reactors, particle accelerators, and nuclear astrophysics, as it helps predict and control the probability of nuclear interactions under different conditions.

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Answer:

a=f/p

Explanation:

p=f/a

f=p×a

this all

a. The Baseball will raise at 3 s

b. The Baseball will reach its highest point at 45 m

c. The baseball will return to the starting point at 6 s

d. The baseball will have a speed of 16 m/s at 1,4 s

a. Vo = 30 m/s

g = 10 m/s²

Vt = V₀ - (g) (t)

0  = 30 - 10 t

10t = 30

t = 30/10

= 3 s

b. Maximum height:

Vt² = Vo² - (2) (g) (h)

 0  = 30² - (2) (10) h

20h = 900

  h = 900/20

= 45 m

c. The baseball will return to the starting point at:

time up = time down

t = 2 (3 s) = 6 s

d. The baseball will have a speed of 16 m/s at:

Vt = 16 m/s

Vt = Vo - (g) (t)

16 = 30 - 10 t

10t = 14

  t = 1,4 s

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1.

a) Hydrogen chloride (HCl) - 1 hydrogen atom, 1 chlorine atom

b) Sulfur dioxide (SO₂) - 1 sulfur atom, 2 oxygen atoms

c) Ammonia (NH₃) - 1 nitrogen atom, 3 hydrogen atoms

d) Carbon monoxide (CO) - 1 carbon atom, 1 oxygen atom

2.

a) Hydrogen chloride (HCl) :

H

|

Cl--C--

|

H

b) Sulfur dioxide (SO₂) :

O

//

O=S

\\

O

c) Ammonia (NH₃) :

H

|

H--N--H

|

H

d) Carbon monoxide (CO) :

O

//

C=O

To determine the focal length of the eye when focused on an object at a distance of 270 cm, we can use the thin lens formula.

Here, f represents the focal length of the eye, do is the object distance (270 cm), and di is the image distance (2.60 cm from the retina).
Rearranging the formula to solve for f:
1/f = 1/do + 1/di
f = 1 / (1/do + 1/di)
Substituting the values:
f = 1 / (1/270 + 1/2.60)
Calculating the focal length:
f ≈ 2.56 cm
Therefore, the approximate focal length of the eye when it is focused on an object at a distance of 270 cm is 2.56 cm.

A compound microscope is a high magnification microscope that increases the amount of magnification by using two lenses. The objective lens in the first lens and the eyepiece lens in the second lens. Both lenses in a compound microscope are convex lenses. Due to its extremely short focal length, the objective lens has a very high magnification (P 1/f). The objective lens's created image acts as the eyepiece's subject. The eyepiece is held in place so that the image created by the objective lens fits inside the eyepiece's focal length.

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Answer:

monochromator

Explanation:

Answer:

The brain analysis technique which allows for identifying which part of the brain is functional per human activity is Neuroimaging.

Explanation:

Brain Imaging (or Neuroimaging) involves the use of direct observation in a living organism of the structure, function and anatomy of its central nervous system.

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