Which scientist developed the theory of gravitation and used it to explain the orbits of celestial bodies?

Christian Doppler discovered what we now call the ""doppler effect"" by measuring the frequency of light and sound waves and how it is affected by the relative motion of the source and the detector.

This is also known as Doppler shift and it is referred to as the change in wave frequency during the relative motion between a wave source and its observer.

Christian Doppler first measured the effect of motion on waves by hiring a group of musicians to play on an open railroad car as it was moving along the track which is therefore how it was discovered by this Austrian scientist.

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the difference of 10 dB is considered as having 10 times the intensity, so difference of 40 dB means :

=》10 × 10 × 10 × 10

=》10000 times

so the the intensity of one sound is 10000 times the other one.

Answer:B

Explanation:They help you evaluate yourself for your final grade.

a dont make sense, d dont make sense, B or C. B!

Uniform circular motion is defined as the constant-speed movement of an object in a circle.

The definition of speed is. The rate at which an object's position changes in any direction. Speed is defined as the ratio of distance traveled to time spent traveling.

Speed is classified as a scalar quantity because it has only one direction and no magnitude.

In summary, the act of turning away or in the opposite direction. reversal, reverse, reversion, turnabout, turnaround.

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The sled moves  160.97 meter up the incline before it comes to rest.

Energy cannot be created or destroyed, according to the law of conservation of energy.

According to conservation of energy:

initial kinetic energy = potential energy + work done against friction

1/2 × 20.0 × 4.0² = 20.0 × 9.8 ×h + 0.20 × 20.0 × 9.8 ×h

h = (1/2 × 20.0 × 4.0²) ÷ {(1 +0.20) × 20.0 × 9.8}

h = 68.03

Hence, l =  68.03/sin25° meter = 160.97 meter

Hence,  the sled moves  160.97 meter up the incline before it comes to rest.

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Answer:

The answers are red bone marrow and blood vessels.

Explanation:

Bone marrow is made of stem cells. These stem cells make red bone marrow, which creates blood cells and platelets for your blood.

The speed of the sports car at the moment of impact can be calculated using the principles of conservation of momentum and the coefficient of kinetic friction. Given the masses of the cars, the distance they skid, and the coefficient of kinetic friction, the initial speed of the sports car can be determined.

To calculate the speed of the sports car at impact, we can apply the principle of conservation of momentum. The total momentum before the collision is equal to the total momentum after the collision. Assuming the SUV is initially at rest, the momentum of the system before the collision is given by the product of the sports car's mass (820 kg) and its initial speed (v). After the collision, both cars skid forward together and come to a stop.

The frictional force between the tires and the road is responsible for this deceleration. The work done by friction is equal to the force of friction multiplied by the distance over which it acts. Using the equation for work done by friction (W = μN), we can find the magnitude of the frictional force. Since the work done by friction is equal to the change in kinetic energy (W = ΔK), we can equate the work done by friction to the initial kinetic energy. Rearranging this equation, we can solve for the initial speed (v) of the sports car at impact.

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The statement "Due to the earth's rotation, a person would be traveling faster at the equator than they would at a position halfway from the equator to the north pole"  is true  because Due to the Earth's rotation, a person at the equator is traveling faster than a person at a position halfway from the equator to the North Pole.

The Earth rotates on its axis once every 24 hours. The circumference of the Earth at the equator is about 40,075 kilometers. This means that a person at the equator is traveling at a speed of about 1,670 kilometers per hour. The circumference of the Earth at a position halfway from the equator to the North Pole is about 20,035 kilometers. This means that a person at this position is traveling at a speed of about 1,001 kilometers per hour.

The reason for this difference in speed is that the Earth is not a perfect sphere. It is slightly wider at the equator than it is from pole to pole. This is because the Earth's rotation causes it to bulge out at the equator. The centrifugal force of the Earth's rotation is strongest at the equator, and this force causes the Earth to bulge out.

The difference in speed between the equator and the poles is not very noticeable to us, but it is significant for objects in space. For example, satellites that are in orbit around the Earth need to be traveling at a much higher speed at the equator than they do at the poles in order to stay in orbit.

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In the preceding question, when you walk down the aisle of the train, your approximate speed relative to the Sun changes slightly.

When you walk down the aisle of the train in motion, you're already moving forward at the same speed of the train. Hence, when you walk down the aisle of the train, your speed increases, and you move away from the back of the train.

However, since you're moving forward with the train, your speed relative to the Sun only increases slightly. The change in your speed relative to the Sun depends on the speed of the train.

For instance, if the speed of the train is 60 mph, and you walk at 3 mph, your relative speed to the Sun is 63 mph. However, this change is slight in comparison to the speed of the train, which is 60 mph.

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In the preceding question, the approximate speed relative to the sun as you walk down the aisle of the train changed slightly. The change is by about 1/10,000th of the speed of light.

The relative speed of an object is determined by comparing its speed to the speed of another object. Here, the object is the person walking down the aisle of the train and the reference point is the sun. The speed of the person walking is relative to the speed of the train, which is moving relative to the sun.

The speed of the person walking down the aisle of the train is affected by the speed of the train, and this change is relatively small.

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Answer:  condensation

Explanation:    

i hope it helped

Answer:

True

Explanation:

I did this on a test and got it right, I swear

The minimum amount of following time needed to create an open front zone is 3 seconds.

An open front zone is a space in front of your vehicle that allows you to see and react to potential hazards. To create an open front zone, you need to have a minimum of 3 seconds of following time between you and the vehicle in front of you.

This means that you should be able to count at least 3 seconds from the time the vehicle in front of you passes a fixed object until your vehicle passes the same object.

Having a 3-second following distance gives you enough time to react to sudden changes in traffic and avoid collisions. It also helps you maintain a safe speed and avoid tailgating, which is a common cause of accidents. In adverse weather conditions, such as rain or snow, it is recommended to increase the following distance to at least 4 seconds to allow for the reduced visibility and longer stopping distance.

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We will have the following:

First, we transform the revolutions per second to radians, that is:

Now, we will have that the final angular velocit will be given by:

So, the angular speed after coupling is -12pi/s. [That is the total angular speed will be counterclock wise]

Answer:

Earth's magnetic field serves to deflect most of the solar wind, whose charged particles would otherwise strip away the ozone layer that protects the Earth from harmful ultraviolet radiation.

Answer:

Earth's magnetic field serves to deflect most of the solar wind,

whose charged particles would otherwise strip away the ozone layer that

protects the Earth from harmful ultraviolet radiation.

We say that momentum is conserved, we mean that the total momentum of a system remains constant.

This means that in any interaction or collision, the total amount of momentum before and after the collision is the same. This is due to the law of conservation of momentum, which states that the total momentum of a closed system (meaning that no external forces are acting on it) is constant. This means that the total momentum before and after an interaction must be the same, as the momentum of the system cannot be changed unless an external force acts on the system. Whether an elastic or non-elastic collision occurs, momentum is always conserved. Kinetic energy, however, is not conserved in a non-elastic collision; instead, it is transformed into heat energy, potential energy, etc.

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Given data:

* The initial velocity of the box is 0 m/s.

* The final velocity of the box is 2.7 m/s.

* The time taken by the box to reach the final velocity is 30 s.

Solution:

(a). By the kinematics equation, acceleration of the box is,

where v is the final velocity, u is the initial velocity, t is the time taken, and a is the accelration,

Substituting the known values,

Thus, the acceleration of the box is 0.09 meter per second squared.

(b). As the acceleration remain uniform,

By the kinematics equation, the distance moved by the box in 6 seconds is,

Here t is 6 seconds,

Substituting the known values,

Thus, the distance traveled by the box in 6 seconds is 1.62 m.

Analytical maps can be created to depict historical ownership, paved areas for cars, parks, natural amenities, and community street design. Streets, being public spaces, require measurement to determine their intended beneficiaries.

Analytical maps offer a valuable tool for visualizing and understanding various aspects of urban planning. By creating maps that showcase historical ownership patterns, paved areas designated for cars, locations of parks and natural amenities, and community street design, it becomes easier to assess the distribution of resources and infrastructure within a city.

In this context, streets hold a significant role as public spaces. They are not solely meant for vehicular traffic but should also prioritize the needs and activities of pedestrians, cyclists, and the wider community. Analyzing street design through mapping can help evaluate whether streets are primarily designed to cater to cars or if they accommodate a balanced and inclusive approach that considers the needs of all users.

To achieve equitable urban environments, it is crucial to assess the intended beneficiaries of street design and identify any discrepancies or biases in the allocation of public space. By utilizing analytical maps, planners, policymakers, and communities can have a clearer understanding of the current state of street design and work towards creating more people-centric and sustainable cities.

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Answer:

The answer is 0.33 H!

Explanation:

Answer:

-2

Explanation:

v0=20

v=10

t=5

a=(v-v0)/t=(10-20)/5=-2

b. upthrust. The upward force exerted by a gas or liquid is called upthrust.

This force is generated due to the content loaded and the pressure exerted by the gas or liquid. A fluid's buoyancy, also known as upthrust, opposes the weight of an item that is partially or completely submerged by exerting an upward push. The weight of the fluid on top causes pressure in a fluid column to rise with depth. As a result, the pressure at the bottom of a fluid column is higher than at the top. Similar to this, an object submerged in a fluid experiences greater pressure at its bottom than it does at its top. A net upward force is exerted on the item as a result of the pressure differential.

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(a) The period of a wheel can be found by dividing the time it takes for each revolution by the number of revolutions per period.

(b) The angular speed of the wheel in rad/s can be determined by dividing 2π (the full angle in radians) by the period.

(a) To find the period of the wheel, we divide the time it takes for each revolution (2.25 s) by the number of revolutions per period. Since the wheel completes one revolution per period, the period is equal to the time per revolution. Therefore, the period of the wheel is 2.25 s.

(b) The angular speed of the wheel can be calculated by dividing the full angle in radians (2π) by the period. Since the wheel completes one revolution per period, the angle traversed is 2π radians. Dividing 2π by the period of 2.25 s gives us the angular speed of the wheel in rad/s. Thus, the angular speed of the wheel is approximately 2.79 rad/s.

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As we know that there are two types of planets in our solar system, the terrestrial and jovian planets. Terrestrial planets are the planets that are made up of rock or metal and are much denser and smaller than the jovian planets.

The jovian planets are the planets that are made up of gases and are much larger and less dense than the terrestrial planets. Now let's talk about the number of moons each planet has. Each of the six terrestrial planets has at least five moons, while the jovian planets have no moons at all.

The planets of the solar system have been classified into two categories. The first type of planets is the terrestrial planets, also known as rocky planets, and the second type is the jovian planets, also known as gas giants. The terrestrial planets are smaller, denser, and composed mostly of rock and metal. On the other hand, the jovian planets are larger, less dense, and mostly composed of gases such as hydrogen and helium. As per the given question, a solar system has six terrestrial planets and four jovian planets.

Each of the six terrestrial planets has at least five moons, while the jovian planets have no moons at all.This implies that the terrestrial planets are much more likely to have moons than the jovian planets. It is because the gravitational pull of a planet depends on its size and mass. A smaller planet will have less gravitational pull, which means it can easily capture and hold onto a moon in its orbit. In contrast, a larger planet will have a stronger gravitational pull, which can cause it to lose moons or not capture any at all. Therefore, the terrestrial planets can hold onto moons better than the jovian planets.

The number of moons a planet can have depends on its size, mass, and gravitational pull. The terrestrial planets in our solar system have a higher likelihood of having moons because they are smaller, denser, and have less gravitational pull than the jovian planets. The jovian planets have no moons at all because they are larger, less dense, and have a stronger gravitational pull that can cause them to lose moons.

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The volume of the gas change by a factor 4/3.

An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.

Calculation:-

From the ideal gas equation

PV = nRT

V =  nRT/P

where n and R are constant

new changes

P' = 3P

T' = 4T

V =  nR4T/3P

Hence, the volume changed by a factor of 4/3.

Volume is a degree of occupied three-dimensional space. it's far more frequently quantified numerically the usage of SI-derived gadgets or by way of diverse imperial gadgets. The definition of length is interrelated with the extent.

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Answer:

striking and fielding

Explanation:

striking and fielding

Explanation:

Force is push or pull on a body.

Contact force is a force that requires contact. It acts between two body that touches on another.

Examples are pushing a car, ringing a bell, kicking a ball.

Non contact forces are forces applied to another object without contact. The action of this force is usually through a targeted force field.

Examples are magnetic force, gravitational force

Answer:

My teacher said 36m when I asked her

Explanation:

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