A merry go round rotates from rest with constant angular acceleration `α` . Ratio of time to rotate first 2 revolutions & next 2 revolutions is 1) 1:1 2) (√2+1):1 3) √2:1 4) 1:√2

Answer:

Chondrules are mysterious little droplets of formerly molten silicate found in chondrite meteorites. Harold C. Connolly Jr. and Rhian H. Jones have written a concise review of the properties of chondrules and ideas for their origin. Over a century of chondrule studies have revealed much about their heating and cooling histories, mineralogy, textures (mineral sizes and how the crystals are intergrown), chemical and isotopic compositions, and ages (old–they formed during the first few million years of Solar System history). Nevertheless, cosmochemists are still uncertain how chondrules formed and whether they inform us of conditions and processes in the protoplanetary disk (also called the solar nebula) or are mere by-products of planet formation.

Answer:

Gravity

Explanation:

That's easy because gravity is the only thing that can pull us down that hard at that fast without anything helping it.

The current in each resistor is 4 A, 2 A, and 4 A, respectively. The voltage drop across each resistor is 12 V.

When three resistors are connected in series with a six resistor and a 12-volt battery, the total resistance of the series circuit is R = R1 + R2 + R3 + ...

The current flowing through the circuit is the same at every point. So, if we want to know the current flowing through each resistor, we need to use Ohm's law, I = V/R, where V is the voltage of the battery and R is the resistance of each resistor.

I1 = V/R1 = 12/3 = 4 AI2 = V/R2 = 12/6 = 2 AI3 = V/R3 = 12/3 = 4 A. The voltage drop across each resistor can be calculated using Ohm's law, V = IR.

V1 = I1R1 = 4 x 3 = 12 VV2 = I2R2 = 2 x 6 = 12 VV3 = I3R3 = 4 x 3 = 12 V.

Therefore, the current in each resistor is 4 A, 2 A, and 4 A, respectively. The voltage drop across each resistor is 12 V.

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Light will reflect at the same angle off a smooth surface as when it first touches it. The direction of reflected light beams for a flat surface is the same. Specular reflection is what is happening here.

When light reflects off of a surface, it happens. Light will reflect at the same angle it was incident upon if the surface is glossy and smooth.

A smooth polished surface is what is referred to as a reflection when a light ray strikes it and bounces back. Surface reflection occurs when a light beam hits it and then leaves it.

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Answer: The part of color that's reflected is the red that bounces off the paper.

Hope this helps you!!!

(☞ﾟヮﾟ)☞      ☜(ﾟヮﾟ☜)

Answer:

The term “chills” refers to a feeling of being cold without an apparent cause. You get this feeling when your muscles repeatedly expand and contract and the vessels in your skin constrict. Chills can occur with a fever and cause shivering or shaking. Your body chills can be constant.

Explanation:

Hope this helps , also put in your own words !!

The ways that the motor design would be improved have been written below

Here are two ways to improve the design of the motor and make it spin faster:

Increase the number of turns on the coil: The coil of wire in the motor generates a magnetic field when electric current flows through it. By increasing the number of turns in the coil, the magnetic field will be stronger, which will cause the motor to spin faster. This is because the force that causes the motor to spin (called the torque) is proportional to the strength of the magnetic field.

Increase the voltage of the battery: The battery in the motor provides the electric current that flows through the coil and generates the magnetic field. By increasing the voltage of the battery, more current will flow through the coil, which will increase the strength of the magnetic field and cause the motor to spin faster. This is because the torque is also proportional to the amount of current flowing through the coil.

Overall, by increasing either the number of turns on the coil or the voltage of the battery (or both), the students can increase the strength of the magnetic field and the amount of torque generated by the motor, which will make it spin faster.

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The magnet is moving down with the north pole downward, and during the transition, there will be an increase in magnetic flux through the ring, which will produce the induced current through the ring.

When the bar is moved toward loop the flux will increase and the induced current will counter this flux.

The induced current tries to oppose the change in magnetic flux and this is possible just if the current direction is counterclockwise.

Result: The current direction is counterclockwise

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Answer:

Solution

λ=v/n

Here, v=344 m s−1

n=22 MHz =22×106 Hz

λ=344/22×106=15.64×10−6m=15.64μm.

The wavelength of a 6.00 ×10² Hz sound wave in air at 20° C is 57.17 cm.

A sound is a vibration that travels as a mechanical wave across a medium. It can spread through a solid, a liquid, or a gas as the medium. Solids carry sound the quickest, liquids somewhat more slowly, and gases the least slowly.

According to physics, sound is described as a vibration that travels through a material like a gas, liquid, or solid as an audible wave of pressure.

Given parameters:

Frequency of sound wave = 6.00 ×10² Hz.

At 20° C, speed of sound in dry air = 343 m/s.

We have to find, the wavelength of the sound wave at 20° C = ?

For wave motion,

Speed = frequency × wavelength

Hence, the wavelength of the sound wave = speed / frequency

= 343 / 6.00 ×10² meter

= 0.5717 meter

= 57.17 cm.

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If a neutral material like fur is rubbed on another neutral object like a rubber ball then the balloon becomes negatively charged and the fur becomes positively charged. The correct option is A.

When two or more bodies come into touch and then break apart, static electricity results. The transport of electrons from one atom to another is caused by this interaction between surfaces.

When the positive and negative charges are out of balance, static electricity is produced.

While electrons like to hop all over the place, protons and neutrons don't move around very much. A negative charge is present when an object (or person) possesses more electrons.

The animal fur lacks electrons while the rubber balloon has an abundance of them.

The rubber balloon has an overabundance of negative charge due to its extra electrons. The absence of electrons on animal fur also gives it a positive charge.

Thus, the correct option is A.

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Answer:

See the answer below

Explanation:

The time Laura took to reach the post office would depend on the speed of cycling.

We know that;

 speed = \(\frac{distance}{time}\)

hence,

time = \(\frac{distance}{speed}\)

Since the distance from Laura's house to the post office is 4 km, the equation becomes;

time = \(\frac{4}{speed}\)

Just ensure that the speed is in km per hour, minute, or seconds in order to obtain the time in hours, minutes, or seconds respectively.

Answer:

D

Explanation:

The bottom of the mountain is not correct because your trying to stop.

The top is of the mountain is when you gain energy.

The middle is when you have the most kinectic energy.

Answer:

W = M g = 150 kg * 9.81 m/s^2 = 1470 N

You were only given 3 significant figures in the question.

The weight of the box is 1471.5 N.

In science and engineering, an object's weight is defined as the force of gravity acting on the thing. Weight is sometimes described as a vector quantity in common textbooks, denoting the gravitational force acting on the item.

Given parameters:

Mass of the box, m = 150 kg.

Acceleration due to gravity, g = 9.8 m/s².

Hence, weight of the box is, W = mg = 150 kg × 9.81 m/s² =1471.5 N.

SO, weight of the  box with a mass of 150 kg on Earth is 1471.5 N.

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Answer: methyl

Explanation:

Answer:

Well my good friend the other person did not give U a good answer, it is actually the third one

Explanation: well it is the most logical of all the answers if you think about it and a lot of the creatures we have in the water today are thought of to have once lived on land based on the fossils we still find to this very day my friend

Potential difference is constant across all branches, current is divided among the branches based on their resistance, and total resistance is determined by the reciprocal sum of individual resistances.

In simple parallel circuits, the potential difference, current, and resistance at different points can be calculated using specific formulas. Here's how each parameter is determined:

Potential Difference (Voltage):

The potential difference, or voltage, across each branch in a parallel circuit remains the same. Therefore, to calculate the potential difference at different points, you can measure the voltage across any component in the circuit.

Current:

In a parallel circuit, the total current flowing into the circuit is divided among the branches. The total current (I_total) is the sum of currents flowing through each branch. You can calculate the current in each branch using Ohm's law: I = V/R, where I is the current, V is the potential difference across the branch, and R is the resistance of that branch.

Resistance:

The total resistance (R_total) in a parallel circuit is inversely proportional to the sum of the reciprocals of individual resistances. You can calculate the total resistance using the formula: 1/R_total = 1/R1 + 1/R2 + 1/R3 + ..., where R1, R2, R3, etc., are the individual resistances of the branches.

By knowing the potential difference across any component, you can calculate the current flowing through it using Ohm's law. Similarly, by knowing the individual resistances, you can determine the total resistance of the parallel circuit.

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Answer:

2000 cm³

Explanation:

Assuming the pressure is constant:

V / T = V / T

1000 cm³ / 300 K = V / 600 K

V = 2000 cm³

The highest frequency a person can screech at is approximately 17,000 Hz. However, it's important to note that the actual audible range for humans typically extends up to around 20,000 Hz, and the ability to produce higher frequencies can vary among individuals.

The highest frequency a person can screech at can be determined by the speed of sound and the length of the vocal cords.

Given:

Length of vocal cords (L) = 0.02 meters

Speed of sound (v) = 340 m/s

The formula for calculating the frequency of a sound wave is: frequency = velocity / wavelength.

In this case, the wavelength (λ) can be determined by the length of the vocal cords. The wavelength of a sound wave is twice the length of the vibrating source. Therefore, λ = 2L.

Substituting the given values, we have:

λ = 2(0.02) = 0.04 meters

Using the formula frequency = velocity / wavelength, we can calculate the highest frequency:

Frequency = 340 / 0.04 = 8,500 Hz

However, this value represents the highest frequency a person can produce using their vocal cords. The actual audible range for humans is typically up to around 20,000 Hz. The upper limit may vary between individuals and can decrease with age or certain medical conditions. Therefore, the closest answer from the given options is approximately 17,000 Hz.

The highest frequency a person can screech at is approximately 17,000 Hz. This value is determined by the length of the vocal cords and the speed of sound. The length of the vocal cords corresponds to the wavelength of the sound wave produced. By using the formula for frequency, which is the velocity divided by the wavelength, we can calculate the highest frequency. However, it's important to note that the actual audible range for humans typically extends up to around 20,000 Hz, and the ability to produce higher frequencies can vary among individuals.

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The acceleration of the car will be -5.68 m/s, and it travels 13.76 m before stopping.

Acceleration is the general term for any process where the velocity changes. There are only two ways to accelerate: either by increasing speed or decreasing direction, or both. The reason for this is that velocity includes both a speed and a direction.

You cannot possibly be accelerating if you don't also change your direction and speed, regardless of how swiftly you are travelling.

It is a vector quantity with m/s² as its SI unit.

According to the question, the given values are :

Initial speed, u=12.5 m/s,

Final speed, v=0 and,

Time, t=2.20 seconds.

Now by using equations of motion :

v= u+at

0=12.5 m/s+a(2.20 s)

a=-12.5/2.20

a= -5.68 m/s

Now distance traveled will be :

v²-u²= 2as

0-(12.5 m/s)²= 2(-5.68 m/s)²×s

s= -156.25/-11.36

s= 13.76 meters.

Hence, the acceleration of the car was -5.68 m/s² and it travelled 13.76 meters before stopping.

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Answer:

C

Explanation:

Impulse is important because it is the force that changes an object's momentum.

Momentum is a physical concept that describes the movement of an object due to the product of its mass and velocity. Momentum is a vector quantity, meaning it has both a magnitude and a direction. In classical mechanics, momentum is conserved, meaning that the total momentum of a system remains constant over time.

In the examples given, impulse is what allows the elevator to be hoisted up, the nylon ropes to hold a climber's weight, the runner to move around the track, and the plane to take off from the runway. Without impulse, none of these activities would be possible.

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The largest producer of primary air pollution in the United States is what? electricity producing plants.

Answer:

electricity production

Explanation:

Answer:

Direction

Explanation: Hope this helps!

Answer:

nvm its direction :))

Explanation:

Speed and velocity both represent a way to measure the change in position of an object relative to time. In fact, for a straight line motion, the speed and velocity of an object are the same (since distance and displacement will be the same). Speed and velocity are measured in the same units: meters per second or m/s.

Velocity is a measure of both speed and direction of motion. Velocity is a vector, which is a measurement that includes both size and direction. Velocity can be represented by an arrow, with the length of the arrow representing speed and the way the arrow points representing direction.

The amount of lateral strain in a tension member can be calculated using Poisson's ratio.

To calculate the lateral strain, we can use the equation: ε_lateral = -ν * ε_longitudinal

Where:

ε_lateral = Lateral strain

ν = Poisson's ratio

ε_longitudinal = Longitudinal strain

Poisson's ratio (ν) is a material property that describes the ratio of lateral strain to longitudinal strain when a material is subjected to an axial load. It is defined as the negative ratio of the transverse strain to the longitudinal strain.

Calculating the lateral strain involves determining the longitudinal strain, which can be calculated using the equation:ε_longitudinal = ΔL / L

Where:

ε_longitudinal = Longitudinal strain

ΔL = Change in length of the tension member

L = Original length of the tension member

Once the longitudinal strain is calculated, we can use Poisson's ratio to determine the lateral strain by multiplying the longitudinal strain by the negative value of Poisson's ratio.

It is important to note that the lateral strain is typically very small compared to the longitudinal strain in a tension member, especially for materials with a low Poisson's ratio.

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a)

The initial speed, u = 0 m/s (The boat starts from rest)

Th final speed, v = 7 m/s

The time, t = 15 s

To find the average acceleration, use the equation below

The acceleration of the boat is in the direction of the motion

b) If the boat continues with the same acceleration for another 6 seconds:

Total time, t = 6 + 15 = 21 s

Speed = Acceration x time

Speed = 0.47 x 21

Speed = 9.87 m/s

Answer:

Given,

Object distance, u=25cm

Focal length, f=20cm

From mirror formula

f

1

​

=

v

1

​

+

u

1

​

−20

1

​

=

v

1

​

−

25

1

​

⇒

v

1

​

=−

20

1

​

+

25

1

​

v=100cm

The image will be real, inverted magnified

Explanation:

Given,

Object distance, u=25cm

Focal length, f=20cm

From mirror formula

f

1

​

=

v

1

​

+

u

1

​

−20

1

​

=

v

1

​

−

25

1

​

⇒

v

1

​

=−

20

1

​

+

25

1

​

v=100cm

The image will be real, inverted magnified

Given the statement:

The further away the galaxy is, the ____________ the shift found by the Hubble.

Let's complete the statement.

According the Hubble's brilliant observation, the shift of the galaxy is directly proportional to the distance of the galaxy from the Earth.

This means that as the distance of the galaxy increases, the shift also increase.

Therefore, the further away a galaxy is, the greater the shift found by the Hubble telescope.

ANSWER:

D. Greater

When an engineering team reaches the stage of iterating to improve the solution in the engineering design process, there are various activities that the team might be doing. One of the most crucial activities at this stage of the design process is testing. Here are a few things that an engineering team might do to test and improve the solution:

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In the balloon simulation, the red circles represent positive charges.

Electrostatics is the branch of physics that studies electric charges at rest. The interaction between electric charges is the foundation for electrostatics. These interactions can either be repulsive or attractive, depending on the types of charges. Electrostatics plays an important role in many aspects of our daily lives.
For example, we use it in the design of electrical circuits, lightning rods, and particle accelerators. The simulation demonstrates the following electrostatic principles: Like charges repel and opposite charges attract.

Each balloon has an equal amount of positive and negative charges when it is neutral.When a balloon is rubbed, electrons are transferred from one surface to the other, creating an imbalance of positive and negative charges.The excess charge is spread over the surface of the balloon. This charge creates an electric field.

As the balloon is rubbed, some of the electrons from the balloon's surface are transferred to the wool. The balloon becomes positively charged while the wool becomes negatively charged. As the balloon is brought closer to the wall, the positive charges on the surface of the balloon repel the positive charges on the surface of the wall.

This repulsion results in the balloons sticking out from the wall, indicating that the charges on the balloon are repelling the charges on the wall.The red circles in the simulation represent the positive charges.

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