a 31.0 kg solid cylinder is rolling without slipping across a horizontal surface at a speed of 5.8 m/s. how much work (in j) is required to stop it?

Answer:

-9ms-1

Explanation:

it will be dat because the initially both are moving at different direction,so for momentum to be conserved they had separate leading to the switching of the two initial velocities

Work and power are fundamental concepts in physics that have practical applications in everyday life.

Power and work are fundamental ideas in physics that have real-world implications. Power is the pace at which work is done, and work is defined as the product of force and displacement.

To calculate the amount of force and energy needed to complete a specific operation, such as lifting bulky objects or moving materials, engineers employ the concepts of work and power.

Work = fd while power = E/t

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Answer:

b

Explanation:

if there is a fire there is no time to waist

The answer depends on depends on your age and your capacities:

If you are a child, the correct option is A.

If you are a scientist adult, the correct option is B.

I will assume that you are a child, so you shouldn't be in any danger. In a laboratory, we can find a lot of glass and flammable things, so it is really dangerous to be near a fire.

Then really easily we can conclude that the correct option is A, immediately notify your instructor (who should have the knowledge to handle the situation)

Never try to handle it by yourself, especially never throw water on the fire, as there are a lot of cases (like if some oil starts combusting) where throwing water will make the situation a lot worst.

Now, if you are an adult and you are instructed in how to handle lab hazards, you should know where the nearest fire extinguisher is, then you can run to get it and extinguish the fire before it goes out of control.

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The missing neutrinos from the sun had merely tranformed into muon and tau neutrinos  escaped detection.Hardly interacting with other matter,neutrinos comes in three different types electron,muon,and tau.

Hence option (b) turning into different type of neutrino in a neutrino oscillation is correct

Disclaimer:The question given on the portal is incomplete .Here is the complete question .

Question :Astronomers and physicists now believe they know what is happening to the missing neutrinos from the Sun (the neutrinos that our theories say should be emerging from the Sun, but our experiments in that underground mine could not find). These neutrinos are:

a)not being produced by the Sun because our star's nuclear fusion period has ended

b)turning into a different type of neutrino in a neutrino oscillation

c)being converted to antimatter in the core of the Sun and being destroyed as they hit matter

d)changing course before they reach the Earth as they hit other neutrinos in space

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Given:

A ball bouncing eventually comes to stop.

To find:

What kind of a system is this?

Explanation:

An open system is a system where the free exchange of matter and energy with the surroundings takes place.

A closed system is where only the energy of the system is shared with the surrounding. In these kinds of systems, the exchange of matter does not take place.

An isolated system is where neither matter nor energy is exchanged between the system and the surrounding.

When a ball is bouncing, it gradually loses its kinetic energy to the surroundings and eventually comes to stop. But the mass of the ball remains the same. Thus this is a closed system.

Final answer:

The given system is a closed system.

Therefore the correct answer is option B.

Answer:

1=f 2=t 3=f 4=t

Explanation:

Answer:

The computers used in education and entertainment are:

Explanation:

Analog computer,Digital COMPUTER,Hybrid Computer

The two types of scientists who could be called upon to investigate a nuclear leak and assess the damage to the environment are: Nuclear Physicists and environmental Scientist.

Two types of scientists who could be called upon to investigate a nuclear leak and assess the damage to the environment are:

Nuclear Physicists: Nuclear physicists specialize in the study of atomic and nuclear processes, including radiation and nuclear reactions. They have expertise in understanding the behavior of radioactive materials, their decay processes, and the potential impacts on the environment. Nuclear physicists can help assess the extent of the leak, analyze the nature of the radioactive substances involved, and determine the potential risks and effects on the environment and living organisms.

Environmental Scientists: Environmental scientists study the interactions between humans and the environment, including the effects of various pollutants and contaminants. In the case of a nuclear leak, environmental scientists can play a crucial role in assessing the impact on ecosystems, air quality, water sources, and soil contamination. They can conduct environmental monitoring, collect and analyze samples, and evaluate the potential short-term and long-term consequences of the leak on local flora, fauna, and human populations.

The expertise of these scientists is beneficial in determining the extent of damage caused by a nuclear leak because they can provide valuable insights into the behavior of radioactive materials, their dispersion in the environment, potential pathways of exposure, and the subsequent impacts on ecosystems and human health. By conducting thorough investigations and employing their scientific knowledge, these scientists can help assess the severity of the leak, develop mitigation strategies, and provide recommendations for remediation and protection of the affected environment.

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Answer:

Explanation:

log10 function is required to convert dB into intensity of a sound. Both are measures of loudness of a sound and the relationship can be expressed as follows:

dB = 10 log10(I/Io), where Io is 10^-12 W/m^2

Substituting, 82 = 10 log10(I/10^-12)

I = 0.0001585 W/m^2

or 1.58*10^-4 W/m^2

Answer:

Explanation:

82dB = 10log(Intensity/10^-12)

Intensity = 10^-12*10^(82/10)

=10^(-3.8)

=1.585*10^-4 W/m2

The magnitude of the average force you need to apply to stop the sled is approximately 352 N.

To find the average force required to stop the sled, we can use the concept of impulse and momentum. The impulse experienced by an object is equal to the change in momentum it undergoes. In this case, the sled's initial momentum is given by the product of its mass and velocity.

The change in momentum is equal to the final momentum minus the initial momentum. Since the sled comes to a stop, its final momentum is zero. Therefore, the change in momentum is equal to the negative of the initial momentum.

The impulse applied to the sled is equal to the product of the average force and the time interval over which the force is applied. Setting the impulse equal to the change in momentum, we can solve for the average force.

Plugging in the given values, which include the sled's mass and velocity, as well as the duration of the force application, we find that the magnitude of the average force needed to stop the sled is approximately 352 N.

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Florida is wet and humid, while California is dry and non-humid. Florida also contains lots of lakes which evaporate to create thunderstorms. Due to Florida's smaller size compared to California, there are more thunderstorms there than in California.

A thunderstorm is often referred to as an electrical storm or a lightning storm. It is defined as a storm characterized by the presence of lightning and its acoustic effect on the Earth's atmosphere, known as thunder. Weak thunderstorms are sometimes called thundershowers.

Some places experience thunderstorms more frequently than others. The state of Florida is smaller than the state of California which is why more thunderstorms occur in Florida than in California.

As Florida is smaller than California, there are therefore more thunderstorms in Florida than in California.

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The forward acceleration of the bicycle will be approximately 1.5244 m/s².

To calculate the forward acceleration of the bicycle, we can use Newton's second law of motion, which states that the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. The formula is:

a = F_net / m,

where a is the acceleration, F_net is the net force, and m is the mass of the object.

Given:

Net force (F_net) = 125 N,

Combined mass of the bicycle and rider (m) = 82 kg.

Substituting these values into the formula, we get:

a = 125 N / 82 kg ≈ 1.5244 m/s² (rounded to four decimal places).

Therefore, the forward acceleration of the bicycle will be approximately 1.5244 m/s².

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The ring will move farther than will the disk.

The torque required to achieve a desired angular acceleration about a rotational axis depends on the moment of inertia of a rigid body.

The moment of inertia of a ring is given by the following equation \(I=mr^{2}\)

similarly, the moment of inertia of a disk is \(I=m\frac{r^{2} }{2}\)

Where, m and r is the mass and the radii of the ring and the disc.

The body's mass distribution and the axis selected to affect the moment of inertia, with larger moments requiring more torque to change the rotation rate. The object with the lowest moment of inertia will descend to the bottom first because it is resistance to rotational motion.

Therefore the disc will reach the bottom first, but due to the higher moment of inertia than the disc the ring will move farther than the disc.

The question is incomplete. The correct question is

A ring and a disk have identical masses, radii and velocities and are not attached to each other. If they each roll without slipping up an inclined plane, how will the distances that they move up the plane before coming to rest compare?

a. The ring will move farther than the disk.

b. The disk will move farther than the ring.

c. The ring and the disk will move equal distances.

d. The relative distances depend on the angle of elevation of the plane.

e. The relative distances depend on the length of the plane.

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Over the course of a year the states that will likely experience the most tornadoes is Kansas.

option C.

A tornadoe is a violently rotating column of air touching the ground, usually attached to the base of a thunderstorm.

Tornadoes are natures most violent storms. Spawned from powerful thunderstorms, tornadoes can cause fatalities and devastate a neighborhood in seconds.

Thus, over the course of a year the states that will likely experience the most tornadoes is Kansas . Kansas is located in an area of the United States known as Tornado Alley, which stretches from Texas to South Dakota.

So from the given options Kensas is the correct option, as it will likey experience the most tornadoes.

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The Cassini is approximately 1.529 x 10^12 meters away from Earth.

To calculate the distance, we can use the speed of light to calculate the distance Cassini is from Earth.

First, we convert the maximum one-way travel time of 85 minutes to seconds:

85 minutes x 60 seconds/minute = 5100 seconds

Next, we use the speed of light, which is approximately 299,792,458 meters per second, to calculate the distance:

distance = speed x time

distance = 299,792,458 m/s x 5100 s

distance ≈ 1.529 x 10^12 meters

Therefore, Cassini is approximately 1.529 x 10^12 meters away from Earth.

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Answer:

0.616

Explanation:

hve a wonderful weekend :) stay safe

The rotor shaft of a generator is spun or rotated by the fluid's force on the blades.

When sunlight strikes a solar cell, electrons in the silicon are expelled, causing the silicon to generate "holes"—the voids the departing electrons left behind.

Electrons will be moved to the n-type layer and holes to the p-type layer if this occurs in the electric field. The bonds [between silicon atoms] in a crystal are created by electrons that are shared by all of the atoms in the crystal.

One of the electrons in one of the bonds is stimulated to a higher energy level by the absorption of the light and is thus given more freedom to move than when it was bound. Silicon is the chosen photovoltaic (PV) material because it has a high absorption rate and can generate power from solar energy.

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The velocity of the stone is 0 after 5 seconds

We have the function h(t) = 400 + 60t - 6t^2 that gives the height of the stone at time t.

To find the time t at which the velocity is 0, we need to find the derivative of h(t) which will give us the velocity function.

So we have;h(t) = 400 + 60t - 6t^2

h'(t) = 60 - 12t

To find the time t at which the velocity is 0, we solve

h'(t) = 0 for t;

60 - 12t = 0

⇒ 12t = 60

⇒ t = 5 s

Therefore, After 5 seconds, the stone's velocity is 0.

Hence, the answer is "t = 5"

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Answer:

Physical change is a temporary change. A chemical change is a permanent change

examples of physical change are freezing of water, melting of wax, boiling of water, etc. A few examples of chemical change are digestion of food, burning of coal, rusting, etc.

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if i had chance to rearrange thw periodical table i would arrange like this because it's not fair to change it it's a fact

The electric force exerted on one sphere by the other is equal to  9.27  × 10⁻⁷ N.

According to Coulomb’s law, the force of attraction between two charged bodies is the product of their charges and is inversely proportional to the square of the distance by which they are separated. This force acts along the line joining the two-point charges.

The magnitude of the electric force is given by:

\(F = k\frac{q_1q_2}{r^2}\)

where k is constant proportionality and has a value of 8.99 × 10⁹ N.m²/C².

Given the charge on one sphere, q₁ = + 6 ×10⁻⁹ C

The charge on the other sphere, q₂ = -11 × 10⁻⁹C

The distance between these two charges, r = 0.80 m

The magnitude of electric force between the spheres will be:

\(F = 8.99 \times 10 ^9(\frac{6\times 10^{-9}\times 11\times 10^{-9}}{(0.80)^2} )\)

F = 927.09  × 10⁻⁹ N

F = 9.27  × 10⁻⁷ N

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Knowing the peak wavelength of light emitted by a star provides valuable information about its temperature.

This relationship is described by Wien's displacement law, which states that the wavelength of maximum intensity (peak wavelength) of the radiation emitted by a black body is inversely proportional to its temperature.

The equation for Wien's displacement law is: λ_max = (b / T)

Where λ_max is the peak wavelength, b is Wien's displacement constant (approximately 2.898 x 10^-3 m·K), and T is the temperature of the star in Kelvin.

By rearranging the equation, we can determine the temperature of the star: T = (b / λ_max)

Therefore, if we know the peak wavelength of light emitted by a star, we can calculate its temperature using Wien's displacement law. This provides important insights into the physical properties, such as the spectral type and evolutionary stage, of the star.

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The constant force acting on a volleyball to accelerate it to a speed of 60 m/s for 5 seconds is 75 N. The acceleration of an object is given by the following formula: a = F/m Where, a is acceleration, F is force, and m is mass.

The force required to accelerate an object is given by: F = ma

We can use the above two formulas to find the constant force acting on a volleyball with a mass of 0.25 kg, which is accelerated to a speed of 60 m/s for 5 seconds.

F = maF

= (0.25 kg) x (60 m/s ÷ 5 s)F

= (0.25 kg) x (12 m/s²)F

= 3 N x 25F

= 75 N

Therefore, the constant force acting on the volleyball is 75 N.

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Friction force is a force that opposes relative motion of two bodies that have contacting surfaces

Yes, the velocity of the book will change as it moves across the surface with friction

Reason:

According to Newton's first law of motion, a body will remain at rest or move with a constant speed in a straight line unless acted on by a force

Friction force, f = Normal reaction, N × Coefficient of friction, μ

A surface with friction has frictional force that opposes the relative motion of an object in surface contact across it

When an object such as a book moves across a surface with friction, the friction force acts on the book having a velocity, opposing the motion of the book, therefore, slowing down the book

Therefore, the velocity of the will change (reduce) as it moves across the surface with friction

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Enough voltage between two points for the associated electric field to ionise air molecules and enable current to flow, a spark will result. It does not create the explosion. The explosion is not brought on by resistance.

An electric discharge (ESD) or abrupt electric current movement across an air gap that heats the air to temps high enough to cause it to illuminate is what causes a static electricity spark.

The insulation between both the electrodes dissolves under the high voltage created by the ignition system, current runs in the discharge occurrence, and an electronic spark is formed between the spark plug's ground electrode and center electrode.

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Answer:

No, some energy will be dissipated energy due to work of air resistance.

Answer:

Atmospheric temperature

The temperature of the atmosphere plays a major role in the heat loss during radiation, if the atmospheric temperature is lower than the radiating temperature then some of the heat is rejected to the atmosphere.

2.Ground surface reflectivity.

This indicates that how much of the rays are reflected from the ground,Metal surfaces, concrete and beach sand can all reflect UV ,while some surfaces do not.The more is the reflection the more will be the intensity of radiation.

3.Presence of pollutants in the atmosphere

Presence of impurities in the atmosphere can become an obstacle in the way of radiation,as rays after striking particles of impurity may get reflected or refracted depending upon the type of impurity present.

The impulse response of the LTI system is h(t) = u(t).Let's find the output for the given input and impulse response using the integral definition of the convolution, given as follows:x(t) h(t) = ∫x(τ)h(t-τ)dτWe have to consider two cases when t < 0 and t ≥ 0.

Case 1:

Case 2:

we can evaluate the integral:

In signal processing and control theory, the impulse response, or impulse response function, of a dynamic system is its output when presented with a brief input signal, called an impulse. More generally, the impulse response is the reaction of any dynamic system in response to some external change.

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