g A child bounces a 50 g super ball on the sidewalk. The velocity change of the super bowl is from 20 m/s downward to 18 m/s upward. If the contact time with the sidewalk is 1 800 s, what is the magnitude of the average force exerted on the superball by the sidewalk

It takes the cheetah two seconds to accelerate at 20 m/s² from rest to a speed of 40 m/s.

Acceleration in colloquial terms means speeding up, but in physics, acceleration can mean speeding up, slowing down, or changing directions.

Mathematically speaking, acceleration a is equal to change in velocity Δv over time t (a = Δv/t). Change in velocity is equal to final velocity v minus initial velocity u (Δv = v - u).

Given that u = 0 m/s, v = 40 m/s, and a = 20 m/s², the time it takes the cheetah to accelerate is:

a = Δv/t

20 = (40 - 0)/t

20 = 40/t

20t = 40

t = 40/20

t = 2 seconds

The complete question is most probably "How much time does it take a cheetah to accelerate at 20 m/s² from rest to a speed of 40m/s?

Learn more about acceleration at https://brainly.com/question/460763.

#SPJ4

At pH 7, the dominant charge on the side group of arginine is positive.

Arginine has a basic amine group, which acts as a proton acceptor and gives arginine a positive charge at neutral pH. However, the exact charge on the side group can vary based on other factors such as ionic strength, presence of other charged species in the solution, and the specific chemical structure of the arginine molecule. To determine the exact dominant charge, a more detailed analysis of the specific chemical and physiological conditions would be required.

To know more about proton please refer:

https://brainly.com/question/12535409

#SPJ4

The sign on the charge of the yellow sphere is positive.

Charge is a fundamental property of matter that describes the interaction between particles and forces. It is one of the four fundamental forces of nature, alongside gravity, the strong nuclear force, and the weak nuclear force. Charge is measured in coulombs (C), and is either positive or negative. Positive charges attract negative charges, and negative charges attract positive charges. The magnitude of the charge affects the strength of the attraction between the particles. Charge can be carried by electrons, protons, and ions, and is responsible for the electric force. Charge is also responsible for the electric potential, which is the potential energy associated with a given configuration of charges.

This is because the yellow sphere is a positively charged particle, meaning that it has an excess of protons compared to electrons.

To learn more about charge
https://brainly.com/question/25923373
#SPJ4

Change in thermal energy = Work done + Heat added

= 55 J + 85 J

= 140 J

So, the change in the thermal energy of the system is 140J.

The change in the thermal energy refers to the difference in the thermal energy of a system before and after a process or a change occurs. Thermal energy is a measure of the total internal energy of a system due to its temperature, and it includes the kinetic energy of the particles and their potential energy due to their interactions.

The change in thermal energy can be positive or negative, depending on whether heat is added to or removed from the system. If heat is added to the system, the thermal energy increases, and if heat is removed from the system, the thermal energy decreases.

The change in thermal energy is a fundamental concept in thermodynamics and plays a key role in understanding the behavior of physical systems and the transfer of energy between them.

Learn more about thermal energy, here:

https://brainly.com/question/18989562

#SPJ1

Since a must be positive, a = √(-20.5136) is not a real value, so there are no values of a that satisfy the equation.

what are the steps to solve the problem:

(a) To find two unit vectors parallel to the vector v = (10, -24), we need to divide the vector by its length to find its direction. The magnitude of v is the square root of the sum of the squares of the components, so the length of v is:

√(10^2 + (-24)^2) = √(100 + 576) = √676 = 26

To find the direction, divide each component of the vector by its length:

v = (10/26, -24/26) = (10/26, -24/26) = (10/26, -24/26) = (10/26, -24/26) = (10/26, -24/26) = (0.3846, -0.9231)

So, the two unit vectors parallel to v are:

u1 = (0.3846, -0.9231)

u2 = (-0.3846, 0.9231)

(b) To find b, we need to scale the unit vector u1 to have a magnitude of 5.0. Since u1 is already a unit vector, we can simply multiply it by 5.0:

b = 5.0 * u1 = (5.0 * 0.3846, 5.0 * -0.9231) = (1.923, -4.616)

(c) To find all values of a such that w = ai - bj is a unit vector, we need to find a so that the magnitude of w is equal to 1.0. The magnitude of w is:

√(a^2 + b^2) = √(a^2 + 4.616^2) = 1.0

Solving for a, we have:

a^2 + 4.616^2 = 1.0^2

a^2 + 21.5136 = 1.0

a^2 = 1.0 - 21.5136

a^2 = -20.5136

Since a must be positive, a = √(-20.5136) is not a real value, so there are no values of a that satisfy the equation.

To learn more about vectors follow the given link: https://brainly.com/question/28028700

#SPJ4

The fundamental length unit and length in the World System of Units is the meter, or meter (symbol: m) (SI). The distance covered by light is measured in meters.

What in physics is light?

Light is the electromagnetic radiation that the human eye can perceive. From radio waves with wavelengths measured in meters to gamma rays with wavelengths shorter than around 1 10 11 meters, electromagnetic radiation occurs throughout a very broad range of wavelengths.

What is energy from light?

Light Energy Uses & Source   Its ability to make different types of sunlight visible to our sight makes light energy a type of kinetic energy. The electromagnetic radiation known as "light" is emitted by warm objects like laser, lamps

To know more about light visit:

https://brainly.com/question/15200315

#SPJ4

The spring constant of the trampoline when the mass of the girl and the height upto which she jumps is given is calculated to be 212.55 N/m.

A girl is standing on a trampoline. She weighs 65 kg and has a 3-meter vertical leap.

We have to find the spring constant.

Since by Hooke's law,

F = -kx

Where,

F = force applied by the spring

k = spring constant

x = displacement

We also know that the spring will exert a force equal to the girl's weight.

So, F = mg

Therefore, (-mg) = -kx

65 × (9.81) = k × (3)

k = (65 × 9.81)/3 = 212.55 N/m

Thus, the spring constant of the trampoline is 212.55 N/m.

The given question is incomplete. The complete question is 'A girl is standing on a trampoline. Her mass is 65 kg and she is able to jump 3 m. What is the spring constant for the trampoline?'

To know more about spring constant:

https://brainly.com/question/12900028

#SPJ4

The trains move at a speed of 15 m/s in relation to the earth. The speed of the ball is -15 m/s in relation to the train. The ball's speed is therefore 15 - 15 = 0 in relation to the earth.

A particle or item's movement with regard to the time is expressed vectorially as velocity. The meter per second (m/s), usually referred to as speed, is the accepted unit of velocity magnitude.

Simply said, velocity is the rate of motion of an object in a specific direction. Using an automobile driving north on a highway as an example, or a rocket after it has launched, as an example of speed.

To know more about Velocity visit:

https://brainly.com/question/18084516

#SPJ1

The force on the proton due to the dipole is [tex]F = 6.67 * 10^{-11} N.[/tex]

This is because the dipole is an electric dipole, meaning that it consists of two charges of opposite sign. Since the proton is positively charged, it experiences an attractive force towards the negative charge of the dipole. The magnitude of this force is given by Coulomb's law,

[tex]F = k\frac{q1*q2}{r^{2}}[/tex]

,where k is the Coulomb constant, q1 and q2 are the charges of the two particles and r is the distance between them.

In this case, [tex]q1 = 1.6 *10^{-19} C[/tex] (the charge of the proton),[tex]q2 = -1.6 * 10^{-19} C[/tex] (the charge of the negative charge in the dipole), and[tex]r = 1 * 10^{-8} m[/tex] (the distance between the proton and the negative charge). Plugging these values into the equation yields [tex]F = 6.67 * 10^{-11} N.[/tex]

learn more about Coulomb's law Refer:brainly.com/question/506926

#SPJ4

complete question:A proton is located at <0, 3 ✕ 10-8, 0> m. What is the force on the proton, due to the dipole <1 ✕ 10-8, 0, 0> m?

Answer:

[tex]\huge\boxed{\sf Power = 1274\ W}[/tex]

Explanation:

Total mass = m = 90 kg + 40 kg = 130 kg

Height = h = 20 m

Acceleration due to gravity = g = 9.8 m/s²

Time = t = 55 s

Power = P = ?

[tex]\displaystyle P=\frac{Work}{Time}[/tex]

Here, the work is done in the form of potential energy.

So,

Work = P.E

As we know,

P.E = mgh

P.E = (130)(9.8)(20)

So,

Power = 25480 / 20

Power = 1274 W

[tex]\rule[225]{225}{2}[/tex]

The best motor for the above purpose is 3.5 kW.

The best motor for the above purpose is 3.5 kW.  In electric motors, electrical energy is converted into mechanical energy. An electric motor produces force in the form of torque by the interaction between its magnetic field and the electric current flowing through its coils. As we know power is defined as the rate of work. Here you have to raise the curtains and defy gravity

so we have

Width = mgH = 193*10*7.5m

= 1418.5 years

Power = W/t

1418.5/5

= 2.8kW

So the best motor for the above purpose is 3.5 kW.

Learn more about motor

brainly.com/question/13258299

#SPJ4

On this graph, a straight line with displacement a constant slope passes through the zero point (0, 0).

The definition of displacement When an object moves in relation to a reference frame, for as when a passenger moves to the back of an airplane or a professor shifts to the left in relation to a whiteboard, the item's position changes. Displacement is the term for this positional alteration.

The definition of displacement is the modification of an object's position. It has a magnitude and a direction and is a vector quantity. It is shown as a arrow that travels from the initial location to the conclusion. An object might move from location A to position B, for instance.

To know more about displacement  visit:

https://brainly.com/question/30087445

#SPJ4

It would take 2 seconds for the same sound wave to travel from the source to observer b who is located twice as far from the source as observer a.

The speed of sound in a medium is constant, meaning that the time it takes for a sound wave to travel a certain distance is proportional to the distance itself. Therefore, if observer b is located twice as far from the source as observer a, it will take twice as long for the sound wave to reach observer b as it would take to reach observer a.

This is because the distance that the sound wave has to travel is twice as great to reach observer b compared to observer a. To summarize, if the distance to the observer is doubled, the time it takes for the sound wave to reach the observer will also double.

To learn more about speed of sound visit: https://brainly.com/question/16012426

#SPJ4

Due to a number of circumstances, such as the growing use of technology and the accessibility of personal information online, fraud is rising alarmingly quickly.

Fraud is increasing for a number of reasons, including:

Technology: Due to the widespread use of technology in daily life, it is now simpler for fraudsters to gain access to private data and engage in fraudulent activity. This covers social media sites, internet stores, and online banking.

Personal data: Due to the growing internet availability of personal data, it is now simpler for fraudsters to access the data they need to commit fraud. This contains names, residences, birthdates, and financial data.

Globalization: As the world has become more interconnected as a result of globalisation, fraudsters are now able to operate internationally.

Learn more about alarming here:

https://brainly.com/question/4181783

#SPJ4

a.There are two types of charge: positive and negative. This is based on the observation that when two objects are rubbed together, they can either become positively charged or negatively charged. Additionally, when objects with different charges are brought near each other, they experience a force that depends on their charges.

The direction of the force is attractive if the charges are opposite, and repulsive if the charges are the same. These observations have been repeatedly confirmed in many experiments and are widely accepted in the scientific community.

Charge is conserved, meaning the total charge in a closed system remains constant. When two objects are rubbed together, they can transfer electrons and become charged. Opposite charges are attracted to each other, while like charges are repelled.

b. Currently, there is no experimental evidence for the existence of a third type of charge. However, some theories beyond the standard model of particle physics propose the existence of new types of charge.

To know more about charges refer to:

brainly.com/question/11944606

#SPJ4

It's possible for a planet like Earth to have formed around a first-generation star, also known as a Population III star.

Population III stars are believed to be the first generation of stars to form in the universe and are composed mainly of hydrogen and helium, with trace amounts of heavier elements. These stars are thought to have formed around 100 million years after the Big Bang.

However, it's also important to note that the conditions necessary for the formation of planets like Earth around Population III stars may have been rare. These stars are thought to have been much more massive and luminous than stars like our Sun, and the intense radiation they emitted may have made it difficult for solid planetary bodies to form and survive.

Additionally, the process of planet formation is thought to require the presence of heavier elements like carbon, oxygen, and nitrogen, which are the building blocks of the building blocks of rocky planets like Earth. These elements are thought to have been synthesized in later generations of stars, so it's likely that planets like Earth formed around later generation stars that had a higher abundance of these elements.

So, while it's possible for a planet like Earth to have formed around a first-generation star, the conditions for this to happen may have been rare, and it's more likely that planets like Earth formed around later generation stars.

You can learn more about planet at

https://brainly.com/question/18496962

#SPJ4

Disease, competition, and predation are examples of factors that depend on density. Population size and density-dependent variables can be positively or negatively correlated.

In ecology, a density-independent factor, also known as a limiting factor, is any force that has an impact on the size of a community of living things independent of the population's density, or the number of people living in a given area.

Competition and predation are two examples of factors that can have an impact on the density-dependent regulation of birth and mortality rates. Abiotic and environmental factors, such as extreme weather and situations like fire, can have an impact on density-independent regulation. These events can also have an impact on birth and mortality rates.

To know more about density visit :

https://brainly.com/question/6329108

#SPJ4

Out of the following conditions  (2) a diver about to dive off the 10-meter platform at the Olympics represents (s) potential energy.Potential energy is energy due to the position or state of an object and is not yet released or used.

The diver has the potential to release energy when they jump off the platform. This energy can be released in the form of kinetic energy when the diver begins to move. The other two conditions do not represent potential energy. Table sugar ready to be ingested does not involve energy stored in the object itself.

The energy present must be released through the process of digestion for the energy to be used. Similarly, a gerbil running on its exercise wheel does not possess any potential energy. The energy is released in the form of kinetic energy as the gerbil moves.

To know more about potential  energy refer to the link   brainly.com/question/27028397

#SPJ4

The change in gravitational potential energy of the couch with 120 kg mass is 9653 J.

The gravitational potential energy is defined as the energy possessed by an object due to its position above the ground. If an object is located near the surface of the earth then the change in gravitational potential energy is given by

ΔU - mgΔh

Where

m = the mass of the object

g = acceleration of gravity

g = 9.8 m / [tex]s^{2}[/tex]

Δh =  change in height of the object

For the couch in this problem, we have m = 120 kg which is its mass.

Δh = 8.2 cm

Now solving the equation, we get:

ΔU = 120 x 9.8 x 8.2 = 9653 J

The energy gained by the couch is 9653 J

If you need to learn more about potential energy click here:

https://brainly.com/question/21175118

#SPJ4

Time until close occurs on reciprocal courses will be 30 minutes, and we can calculate this by first finding out relative speed.

To determine the time it will take until closure occurs between two aircraft traveling on reciprocal courses, you must first calculate their relative speed. This can be done by subtracting the speed of one aircraft from the other. In this case:

The relative speed would be:

360 mph - 240 mph = 120 mph.

Next, you can use this relative speed and the distance between the two aircraft to calculate the time until closure using the formula:

Time until closure = Distance between aircraft / Relative speed

So, for the two aircraft traveling 60 miles apart and with a relative speed of 120 mph, the time until closure would be 60 miles / 120 mph = 0.5 hours or 30 minutes.

Learn more about time here:

https://brainly.com/question/29775794

#SPJ4

The Romans could have made the statue out of lodestone, or placed a core of lodestone inside. Then the frame of the statue would have had to be made of iron in order to have equal net forces around the statue.

Lodestones led to a magnetic compass.

Lodestone is a form of magnetite that exhibits distinctive magnetic qualities. This quality led to the use of lodestones as an early form of compass, as they could be used to show the way north.

As is often the case with scientific phenomena that are difficult to explain, gemstones have historically been associated with magical or alchemical events, and many people who practice magic use gemstones in their work. Magnets and objects with magnetic qualities continue to be popular in alternative medicine and magical practices.

Magnetite is a form of iron oxide. When a rock has a certain crystal structure and chemical composition, it has the potential to become a magnet. If a stone is magnetized, it will be attracted to the earth's magnetic poles, and when it is suspended in the air, it will slowly point towards the poles. It will also attract iron, as observed by the Chinese in the fourth century AD.

Seafarers used lodestones in their navigation; the Chinese seem to have been the first to discover the properties of magnetite in a navigational context.

Learn more about lodestone at https://brainly.com/question/3199122

#SPJ4

Answer:

Explanation:

ddddddddddddddddddd

The magnification of the lens is not constant but the linear magnification of the lens is constant.

There are various factors independent of the magnification. The magnification of the lens is constant but the linear magnification of the lens is not constant. This statements means that if we are displacing the object from one location to the other then the height of the object is not changing at all. But the height's image will eventually change. It gives a different value of the magnification.

The magnification of a lens can be defined as the ratio of the height of an image to the height of an object. It is also given in terms of image distance and object distance. It is equal to the ratio of image distance to that of object distance.

Learn more about magnification:

brainly.com/question/13129089

#SPJ4

Basically, light waves hit different parts of the spoon at different angles, so they all bend a little differently. By the time they come back to you, they're all crooked, so you're looking upside down. It has a concave side.

A glossy spoon is like a mirror, only curved. Since the surface is perfectly smooth, it creates a mirror image, or specular reflection. However, since the spoon is curved, the direction of the reflected light depends on where it hits. This outwardly curved surface is called a convex surface. Basically, light waves hit different parts of the spoon at different angles, so they all bend a little differently. By the time they come back to you, they're all crooked, so you'll look upside down. It has a concave side.

Learn more about concave

brainly.com/question/20380620

#SPJ4

A meteorites that strike the earth may be composed of chondrites and achondrites.

A meteorite is a piece of solid debris from a space-born object, such as a comet, asteroid, or meteoroid, that makes it through the atmosphere and lands on the surface of a planet or moon and it is made up of chondrites and achondrites.

The object heats up and emits energy as it enters the atmosphere due to a number of causes, including friction, pressure, and chemical reactions with the atmospheric gases. Astronomers refer to the brightest examples as "bolides"; it then transforms into a meteor and creates a fireball, also known as a shooting star or falling star. The sizes of meteorites vary widely. A bolide is a meteorite big enough to crater, according to scientists.

Learn more about meteorites

brainly.com/question/1207919

#SPJ4

The density of wood substance is about 1.5 grams per cc, and practically no differences in this value exist among species. *Based on specimens in air-dry condition (12-15% moisture content).

What is the mass in grams?

To learn more about mass refers to:

https://brainly.com/question/19385703

#SPJ1

The acceleration of the object is 5 m/s². The result is obtained by using the Newton's second law.

The Newton's second law states that "The acceleration is directly proportional to the net force acting on an object and inversely proportional to the object's mass." It can be expressed as

a = ∑F/m

Where

An object with a mass of 12 kg is acted upon by a force of 60 N.

Find the acceleration of the object!

Using the Newton's second law formula, we get acceleration.

a = ∑F/m

a = 60/12

a = 5 m/s²

Hence, the acceleration of the object is 5 m/s².

Learn more about Newton's second law here:

brainly.com/question/30396994

#SPJ4

The maximum height that the coin can reach is 17.46 meters and

The time taken to reach the coin to its initial position is 1.89 s

Given,

The coin is tossed into the air vertically upward with a speed of 18.5 m/s

Therefore, initial speed = 18.5 m/s.

acceleration acting on the coin is g m/s²

where g = 9.8 m/s²

we know,

v² - u² = 2aS          

final velocity (v) = 0      (when the coin reaches maximum height)

a = -9.8 m/s²          (g is acting opposite to the initial motion of the body)

S = the maximum height that the coin can reach

i) to find the maximum height

substitute the values in the equation

0² - (18.5)² = 2(-9.8) S

342.25 = 19.6 S

⇒ S = 342.25/19.6

∴ S = 17.46 m

Therefore, the maximum height that the coin can reach is 17.46 meters

ii) to find the time taken for the coin to reach the initial position

we use v = u + at   where t = time taken to reach initial position

0 = 18.5 - 9.8 t

⇒ t = 18.5 / 9.8

∴ t = 1.89 s

Therefore, the time taken to reach the coin to its initial position is 1.89 s

Learn more about the maximum height here: https://brainly.com/question/12446886

#SPJ4

Answer:

flammability, toxicity, acidity, reactivity (many types), and heat of combustion.

Explanation:

have great day

The statement is false, the faster the vehicle moves the less the kinetic energy. As fast the thing in motion the highest is kinetic energy.

An object's mass and velocity both affect its kinetic energy. According to the formula for kinetic energy,

KE = 0.5 mv^2, where m is the mass of the object and v is its velocity. As the velocity of an object increases, so does its kinetic energy. This means that a faster-moving vehicle has more kinetic energy than a slower-moving vehicle with the same mass. Kinetic energy has a number of important applications in physics and engineering. For example, in mechanics, it is used to calculate the amount of work that can be done by a moving object and to analyze the behavior of objects in motion. In thermodynamics, kinetic energy is used to describe the thermal energy of particles in a substance, such as the random motion of gas molecules.

To know more about kinetic energy please refer: https://brainly.com/question/26472013

#SPJ4

The acceleration of the box as it slides down the ramp is approximately 4.3 m/s^2.

The acceleration of the box can be calculated using the formula:

a = g * sin(θ)

where:

Converting 25 degrees to radians:

θ = 25° * (π / 180°) = 0.43 radians

Now we can plug in the values:

a = 9.8 m/s^2 * sin(0.43 rad) ≈ 4.3 m/s^2

You can learn more about acceleration at

https://brainly.com/question/605631

#SPJ4