What is freezing and does it require the addition or removal of energy? What is an example

\(Work=Force \: × \: displacement \\ => W=Fs \\ \\ Given, \\ Force=25 \: N \\ Displacement=2m \\ \\ so \: work = 25 \: N \: \times 2m \\ = > work = 25kgm {s}^{ - 2} \times 2m \\ = > work = 50kg {m}^{2} {s}^{ - 2} \\ = > work = 50J\)

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A weightlifter must exert 25 Newtons of force to lift a set of barbells 2 meters off the ground, the weightlifter did 50 Nm of work on the barbells when he lifted them. The correct option is A.

To calculate the work done by the weightlifter in lifting the barbells, we can use the formula:

Work = Force × Distance

Here, it is given that:

Force = 25 Newtons

Distance = 2 meters

Substituting the values into the formula:

Work = 25 N × 2 m

Calculating the multiplication:

Work = 50 Nm (Newton-meters)

Thus, the weightlifter did 50 Nm of work on the barbells when he lifted them, the correct answer is A. 50 Nm.

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SMM2 refers to the Standard Method of Measurement 2. It is a document that specifies the method and processes used in measuring buildings and civil engineering works. SMM2 is commonly used in the construction industry.

The following are explanations of the clauses under Standard Method of Measurement 2 (SMM2):

i. D.10: This clause under SMM2 relates to the painting of metal and timber surfaces. It stipulates that when painting the surfaces of timber or metal, the preparation of surfaces and application of paint must conform to manufacturer specifications. It also specifies that the paint must be applied using a brush, roller, or spray. The clause then goes on to outline specific measurements for the thickness of paint coating to be applied on surfaces.

ii. D.12.4: This clause under SMM2 refers to the construction of walls using concrete blocks. It states that the concrete blocks used should have a minimum density of 1500 kg/m3. It also outlines specific measurements for the thickness of the mortar to be used for bonding the blocks together. The clause further specifies the measurement of the joint thickness between blocks.

iii. D.12.6: This clause under SMM2 refers to the rendering of walls with a cement mortar mix. It specifies that before rendering, the surface of the wall must be clean, dry, and free of debris. It also outlines specific measurements for the thickness of the rendering to be applied to the wall. The clause then stipulates that the rendering should be finished with a smooth surface that conforms to the architect's specifications.

iv. D.12.8: This clause under SMM2 refers to the painting of interior plastered walls. It stipulates that the preparation of surfaces and application of paint must conform to manufacturer specifications. It also specifies that the paint must be applied using a brush, roller, or spray. The clause then goes on to outline specific measurements for the thickness of paint coating to be applied on surfaces.

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Answer:(of a reaction or process) accompanied by the release of heat.

Explanation: trust moi

A moon has more mass than the planet it circles and less mass than a star.

Do planets have a greater mass than stars?

By this definition, "stars" must be larger than planets in terms of mass. The size of a white dwarf would be comparable to that of a moon or small planet, but its mass would be approximately 200–1300 times that of Jupiter. Even more extreme are neutron stars, which are about the size of an asteroid but have a mass of several thousand Jupiters.

Why is the weight of the same object different on different planets Class 7?

The weight of an object is determined by its mass and the gravitational force that it experiences. The separation between two objects affects how strong gravity is. Because of this, an object weights differently on many planets.

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Answer:

The answer is -0.5m/s2

Explanation:

I did the test and got it right.

The magnitude of the acceleration of the dog is ​0.5 m/s².

Acceleration is the rate at which speed and direction of velocity vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates.

Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. Both effects contribute to the acceleration for all other motions. Acceleration is a vector quantity since it has both a magnitude and a direction.

Initial speed of the dog = 7.5 m/s

Final speed of the dog = 0 m/s

Time taken = 15 second

Hence acceleration of the dog = change in speed/ time interval

= (final speed - initial speed)/time interval

= ( 0 m/s - 7.5 m/s)/15 second

= - 0.5 m/s²

Hence, the magnitude of the acceleration of the dog is ​0.5 m/s².

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Answer:

Explanation:

Specific heat capacity of a body is expressed as H = mcΔt

H = heat energy released by the body

m = mass of the body

c = specific heat capacity of the body

Δt  = change in temperature of the body

Given H = 2000J, m = 0.5 kg, c = 4,186 J/kg° C.

Δt = H/mc

On substituting the given value;

Δt  = 2000/4,186*0.5

Δt   = 2000/2093

Δt = 0.96°C

The temperature difference between when the blood arrives at the body surface and returns back to the Interior of the body is 0.96°C

Answer:

11m/s^2

Explanation:

Acceleration can be calculated by diving speed by time. Since we know speed and time, acceleration can be calculated.

55/5 = 11m/s^2

Due to friction, it was converted to heat when the bicycle stopped and stopped. When the moving bicycle coasted to a stop, what happened to its energy

without difficulty or effort, advance or succeed: While I battled, my sister breezed through school and had excellent honours. SMART Vocabulary includes associated terms and expressions.

This may be a defence strategy that prevents from becoming overpowered or dealing with emotions we don't understand how to handle, or it may simply be a way to help us "push through." Simply put, you may be coasting if you find it difficult to exert the same level of effort, desire, or interest in daily activities.

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Answer: tortoise

Explanation:

Given the following :

Speed of tortoise = 1m/s

Speed of hare = 3m/s

Mass of hare = 5kg

Mass of tortoise = 20kg

Momentum = product of Mass and velocity

Momentum of hare = mass of hare × Velocity of hare

Momentum of hare = 5kg × 3m/s = 15kgm/s

Momentum of tortoise = mass of tortoise × Velocity of tortoise

Momentum of tortoise = 20kg × 1m/s = 20kgm/s

Therefore, tortoise has a greater momentum than hare.

Answer:

The equations are both written in slope-intercept form, so I can see that the slope of one equation is 2 and the other is 8. If the slopes of lines are different, they will always intersect at a point.

Explanation:

Answer:

The resulting speed of the ball is;

10 m/s

Explanation:

The given parameters are;

The amount of work done by the lever = 5.0 J

The mass of the ball on which the work is done, m = 0.10 kg

By the principle of conservation of energy, we have;

The work done by the lever = The kinetic energy. K.E., gained by the ball

The kinetic energy, K.E., is given by K.E. = 1/2·m·v²

Where, for the ball, we have;

m = The mass of the ball

v = The resulting speed of the ball

Therefore, by substituting the known values, we have;

The work done by the lever = 5.0 J = The kinetic energy. K.E., gained by the ball =  1/2 × m × v² =  1/2 × 0.10 kg × v²

∴ 5.0 J = 1/2 × 0.10 kg × v²

v² = 5.0 J/(1/2 × 0.10 kg) = 100 m²/s²

v = √(100 m²/s²) = 10 m/s

The resulting speed of the ball, v = 10 m/s.

Answer:

5 years\(\)

Answer: 0-3 minutes

Explanation:

On the side of the graph, it shows you the distance the car was moving. As you know, MPH (miles per hour) shows how fast an object is moving, meaning that the car was going around 0-1 mph around minutes 0-3. Just make sure you know how to read a graph and this will become an easy question for you :)

Answer:

5-8 minutes the car isn't traveling. The g above is wrong

Explanation:

When a car travels around two curves, one with twice the radius of curvature of the other, the change of velocity of the car is greater in the curve with the smaller radius of curvature. This is because the square of the speed is directly proportional to the radius of the turn, and the centripetal force required to keep the car moving in a circle is greater in the curve with the smaller radius of curvature.

As the radius of the circle decreases, the centripetal force required to keep the car moving in a circle increases. Since the car is traveling the same distance at a constant speed around both curves, the velocity must change in the curve with the smaller radius of curvature in order to maintain the necessary centripetal force.

Therefore, the change of velocity of the car is greater in the curve with the smaller radius of curvature.

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so the answer is easy it's air

A typical voltage for running an agarose DNA gel would be in the 4 - 10 volts/cm under horizontal electrophoretic conditions.

Agarose gel electrophoresis is a method of gel electrophoresis used in biochemistry, molecular biology, genetics, and clinical chemistry to separate a mixed population of macromolecules such as DNA or proteins in a matrix of agarose, one of the two main components of agarose.

Agarose is a natural polymer prepared from seaweed (red algae) and consists of the D-galactose and 3,6-anhydro-L-galactose.

Why agarose gel is used for DNA?

Agarose's high gel strength allows for the handling of low percentage gels for the separation of large DNA fragments.

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The answer is The boiling Point as the transition from liquid to gas occurs at the boiling point.

The actuality that it changes from liquid to vapor indicates that you are working with the substance's boiling point.

The material is pure if its temperatures does not change when it turns phases. Since water turns liquid at 100°C in this situation, water is likely the culprit.

The temperature at which a specific liquid will boil is known as its boiling point. For instance, water reaches its boiling point at 1 atm, or 100 degrees Celsius. The temperature of the liquid, the pressure of the atmosphere, and the pressure of the vapor all affect its boiling point.

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Knowing the velocity of a cloud in the disk of the Milky Way helps astronomers figure out how far away it is because of a principle called the Doppler effect.

The Doppler effect is the change in the frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. When an object, such as a cloud of gas, is moving away from an observer, the wavelength of light it emits appears longer, or red-shifted. Conversely, when an object is moving towards an observer, the wavelength of light it emits appears shorter, or blue-shifted.

By measuring the Doppler shift of the light emitted by a cloud in the disk of the Milky Way, astronomers can determine whether it is moving towards or away from us. If they know the cloud's velocity and can measure the Doppler shift, they can calculate how far away the cloud is using the Doppler equation. This allows astronomers to map out the structure of the Milky Way and better understand the movements of objects within it.

In conclusion, knowing the velocity of a cloud in the disk of the Milky Way helps astronomers figure out how far away it is through the use of the Doppler effect, which allows them to measure the shift in light wavelength and calculate distance.

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When a photon scatters from a free electron, both the photon and electron change direction. The energy and momentum of the photon before and after the scattering must be conserved. We can use conservation of energy to determine the angle at which the recoiling electron has kinetic energy equal to the energy of the scattered photon.

The energy of a photon is given by:

E = hf

where E is the energy of the photon, h is Planck's constant, and f is the frequency of the photon.

The momentum of a photon is given by:

p = h/λ

where λ is the wavelength of the photon.

Let's denote the energy and momentum of the incoming photon as Ei and pi, and the energy and momentum of the scattered photon as Ef and pf, respectively. The energy and momentum of the recoiling electron can be determined from the energy and momentum conservation equations:

Ei + mec^2 = Ef + (mev^2)/2

pi = pf + me*v

where me is the mass of the electron, c is the speed of light, and v is the velocity of the recoiling electron.

When the recoiling electron has kinetic energy equal to the energy of the scattered photon, we have:

Ef = E

pf = pi

Therefore, the energy and momentum conservation equations become:

Ei + mec^2 = E + (mev^2)/2

pi = h/λ

Solving for the velocity of the recoiling electron, we get:

v = sqrt(2*(Ei - E)/(me))

Substituting the expression for pi, we get:

sqrt((2*(Ei - E)λ)/me) = hcosθ/λ

where θ is the scattering angle.

Solving for the scattering angle, we get:

cosθ = (mec^2λ)/(2h(Ei - E))

Substituting the given values of λ = 0.00220 nm and Ei = E, we get:

cosθ = (mec^2λ)/(2hE) = (9.1094×10^-31 kg)(299792458 m/s)^2(0.00220×10^-9 m)/(26.6261×10^-34 J·s1.24×10^3 eV/nm)

cosθ ≈ 0.854

Taking the inverse cosine of both sides, we get:

θ ≈ 32.2 degrees

Therefore, the photon scattering angle at which the recoiling electron has kinetic energy equal to the energy of the scattered photon is approximately 32.2 degrees.

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Answer:

c.negative

Explanation:

Answer:

Look below.

Explanation:

If additives are having negative effects on health and the environment, it would be wise to not use detergents containing these additives. These additives could threaten living things such as humans and animals.

There is concern that extra additives in detergents can have negative health and environmental impacts, then it would be very unwise to use detergents containing these additives

It can be defined as the origination of the contaminant substance that poisonous or harmful to our natural environment.

There are several types of pollution that exist in our nature depending on the state and composition of the contaminant, for example, water pollution can exist due to the eutrophication process.

It would be quite unwise to use surfactants that include these additional ingredients since there is fear that they might have a harmful influence on your well-being and the environment.

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Answer: As Earth spins on its axis, we, as Earth-bound observers, spin past this background of distant stars. As Earth spins, the stars appear to move across our night sky from east to west, for the same reason that our Sun appears to “rise” in the east and “set” in the west.

Explanation:

Answer:

false plz mark brainliest

The International System of Units is the modern form of the metric system. It is the only system of measurement with an official status in nearly every country in the world.

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Force exerted on the skier is lesser than the weight of the skier.

There is a force which is pulling skier to down which is gravitational force but this force would have two component, because it makes an angle to the earth center.

So the normal force will be = mgcosФ

since the value of cosФ would vary from 0 to 1 , but in case of skis , the values cant be 0 or 1.

So, mgcosФ will always be less than 1.

It means if weight is mg then

mgcosФ < mg

which means normal force will always be less than the weight.

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Answer:

B

Explanation:

reading the volume of water in a graduated cylinder which can be read to the nearest mL is accurate, it lacks precision due to the bottom meniscus formed.

the bottom meniscus may cause a wrong reading due to refraction of light

A common unit for measuring energy is the calorie, defined as the amount of energy required to raise one gram of water from 14.5°C to 15.5°C. In food, energy is usually measured in kilocalories, which are often referred to as dietary Calories.

Thermodynamics is the study of energy transformations, which includes two types of energy: potential energy (stored energy) and kinetic energy (energy being used). Energy transformations are inefficient, meaning that organisms must take in and expend energy to live. The law of conservation of energy states that energy cannot be created or destroyed.

Energy transformations result in an increase in entropy, which leads to randomness and is measured as a disorder in a system. Entropy is often associated with inefficiencies in energy conversions. A common unit for measuring energy is the calorie, defined as the amount of energy required to raise one gram of water from 14.5°C to 15.5°C. In food, energy is usually measured in kilocalories, which are often referred to as dietary Calories.

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Answer:A

Explanation:

In a gas-powered car, a battery A) produces chemical potential energy to run the engine.