For each of the situations described below, the object considered is undergoing some changes. Among the possible changes you should consider are:
(Q) The object is absorbing or giving off heat.
(T) The object's temperature is changing.
(U) The object's internal energy is changing.
(W) The object is doing mechanical work or having work done on it.
(C) The objects chemical energy is changing.
For each of the situations described below, identify which of the four changes are taking place and write as many of the letters Q T U W C (or none) as are appropriate.
1. A cylinder with a piston on top contains a compressed gas and is sitting on a thermal reservoir (a large iron block). After everything has come to thermal equilibrium, the piston is moved upward somewhat (very slowly). The object to be considered is the gas in the cylinder.
Q T U W C
2. Consider the same cylinder as in part 1, but it is wrapped in styrofoam, a very good thermal insulator instead of sitting on a heat reservoir. The piston is pressed downward (again, very slowly), compressing the gas. The object to be considered is the gas in the cylinder.
Q T U W C
3. An ice cube sitting in the open air is melting.
Q T U W C
4. A mixture of two moles of hydrogen gas and one mole of oxygen gas in a thermally insulated vessel is subjected to small spark (contributing negligible energy) and converts to water vapor.
Q T U W C
Explain your reasoning for each of these cases.

Answer:

108 N

Explanation:

Use Newton's second law.

F = ma

F = (90 kg) (1.2 m/s²)

F = 108 N

At point 1, more reagents are converted to product than products are converted to reactants, and at point 2, the concentrations of H20, O2, and H2 are all moving toward their equilibrium concentrations.

The word equilibrium is derived from the Latin word libra, which means weight or balance.an open book that is lying flat. a vehicle that is going steadily. a chemical reaction that has equal forward and reverse reaction rates.

In order to sustain a blood pH around 7.35 and 7.45, carbon dioxide (H2CO3) & bicarbonate anion (HCO3) are buffers found in human blood. Death may result from a value of greater than 7.8 or less than 6.8.

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Mars Global Surveyors (MGS) and later orbiters found the following  minerals on the  Martian surface;

The Mars Global Surveyors (MGS) and later orbiters suggest that the Martian crust contains a higher percentage of volatile elements such as Sulphur and chlorine than the Earth's crust does.

These scientists also conclude that the most abundant chemical elements  in the Martian crust are those found in Igneous rock.

These elements include the following;

They also, suggest that hydrogen is found in ice (water) while carbon is found in carbon dioxide and carbonates.

From the given options the minerals found in Martian surface include;

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In vacuum, going at 2.99×10^8 m/s.

Answer:

Curvature

Explanation:

Answer:

The new speed of the car is 30 m/s.

Hope you could get an idea from here.

Doubt clarification - use comment section.

Answer:

hand feels pain

Explanation:

I think the right answer is hand feels pain.

According to Newton's third law of motion, for every action, there is an equal and opposite reaction. In the scenario you described, the action force is the hand hitting the table.

Hand feels pain: When the hand hits the table, the hand exerts a force on the table. Simultaneously, the table exerts an equal and opposite reaction force on the hand. This reaction force is responsible for the sensation of pain that the hand feels upon impact. It is essentially the force transmitted back from the table to the hand.

Hand stops moving: The reaction force from the table, acting in the opposite direction to the action force, causes the hand to stop moving. As the hand applies a force to the table, the table applies an equal and opposite force to the hand, resulting in a deceleration of the hand's motion until it comes to a stop.

Table hits hand: As mentioned earlier, the table exerts a reaction force on the hand. This reaction force acts in the opposite direction to the action force, causing the table to exert a force on the hand. Therefore, the table hitting the hand is a consequence of the reaction force resulting from the hand hitting the table.

Table makes a noise: The noise produced when the hand hits the table is not directly related to the reaction force itself. The noise is typically the result of the vibrations and movements caused by the impact between the hand and the table. These vibrations propagate through the table, air, and other surrounding objects, creating sound waves that we perceive as noise.

It's important to note that while Newton's third law states that the magnitudes of the action and reaction forces are equal, the effects they produce can be different due to variations in mass, acceleration, and other factors involved.

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Explanation:

23 km/hr x 1.5 hrs = 34.5 km

34.5 km = 34500 meters

Answer:

First, we can find the velocity of the rock just before it hits the ground using the equation:

v^2 = 2gh

where v is the final velocity, g is the acceleration due to gravity (9.81 m/s^2), and h is the height the rock falls from (7.0 m).

v^2 = 2(9.81 m/s^2)(7.0 m) = 136.89 m^2/s^2

v = √136.89 m^2/s^2 = 11.7 m/s

The momentum change of the rock caused by its fall is:

Δp = mv = (18 kg)(11.7 m/s) = 211.2 kg m/s

The resulting change in the magnitude of earth's velocity can be found using the conservation of momentum equation:

m1v1 + m2v2 = (m1 + m2)v'

where m1 and v1 are the mass and velocity of the rock before it falls, m2 and v2 are the mass and velocity of the earth before the rock falls (which we can assume is negligible), and v' is the velocity of the rock-earth system after the rock falls.

We can rearrange this equation to solve for v':

v' = (m1v1)/(m1 + m2)

v' = (18 kg)(11.7 m/s)/(18 kg + 6.0 × 10^24 kg)

v' = 1.95 × 10^-24 m/s

This means that the change in the magnitude of earth's velocity is essentially zero (which makes sense, since the mass of the earth is so much greater than the mass of the rock).

The momentum change of the rock caused by its fall is 211.2 kg·m/s, and the resulting change in the magnitude of earth’s velocity is 3.5 × 10⁻²³ m/s.

What is Momentum?

Momentum is a physics concept that describes the amount of motion an object has.  The units of momentum are kg m/s. In a closed system, the total momentum before an event or interaction is equal to the total momentum after the event or interaction.

To solve this problem, we need to use the law of conservation of momentum, which states that the momentum of an isolated system remains constant.

The momentum change of the rock is given by the formula:

Δp = mv

where m is the mass of the rock, and v is the change in velocity.

First, we need to find the final velocity of the rock. We can use the formula for the velocity of a falling object:

v² = 2gh

where g is the acceleration due to gravity, and h is the height of the fall.

Plugging in the given values, we get:

v² = 2 × 9.8 m/s² × 7.0 m

v² = 137.2

v = √137.2

v = 11.7 m/s

The change in the magnitude of Earth's Velocity  can be found using the formula:

Δv = Δp / M

where M is the mass of the earth.

The mass of the earth is given as 6.0 × 10²⁴ kg.

Δp = mΔv

Δp = 18 kg × 11.7 m/s

Δp = 211.2 kg·m/s

Δv = Δp / M

Δv = 211.2 kg·m/s / 6.0 × 10²⁴ kg

Δv = 3.5 × 10⁻²³ m/s

Therefore, the momentum change of the rock caused by its fall is 211.2 kg·m/s, and the resulting change in the magnitude of earth’s velocity is 3.5 × 10⁻²³ m/s.

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Answer:

anticline

Explanation:

hope u will understand

Answer:

Got it right on edge 2020

Explanation:

anticline

Pressure builds under the surface of Earth, causing mountains to form.The correct answer is option D.

Uplift refers to the geological process that elevates the Earth's surface, resulting in the formation of mountains. This process is primarily driven by tectonic forces, including the movement and collision of Earth's lithospheric plates.

When two plates converge, immense pressure builds up beneath the surface, causing the crust to buckle and fold. This deformation leads to the formation of mountains, as rocks are pushed upward and displaced vertically.

As the uplift process continues over millions of years, mountains gradually take shape. Erosion and weathering play significant roles in shaping their features, but it is the initial uplift that initiates the formation of mountains.

As the Earth's surface is elevated, a wide range of landforms can emerge, including rugged peaks, deep valleys, and steep slopes.

Uplift has a profound impact on the Earth's surface and ecosystems. Mountains alter local climates, influencing precipitation patterns and creating variations in temperature and wind patterns.

Therefore, uplift plays a crucial role in shaping the Earth's surface and influencing various geological, biological, and climatic processes.

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The statement "Something established by authority as a rule for measurement is called a standard unit" is True.

Something established by authority as a rule for measurement is called a standard unit. Standard units provide a consistent and universally accepted basis for measuring quantities in various fields such as science, engineering, and commerce.

Standard units are essential because they ensure consistency and accuracy in measurements across different contexts and locations. They serve as a reference point for comparing and quantifying physical quantities. By establishing standardized units, authorities promote uniformity and facilitate effective communication and collaboration in scientific research, technological advancements, and global trade.

In the International System of Units (SI), which is the most widely used system of measurement, there are seven base units: meter (length), kilogram (mass), second (time), ampere (electric current), kelvin (temperature), mole (amount of substance), and candela (luminous intensity). These base units are defined based on fundamental physical constants or natural phenomena, providing a reliable and reproducible foundation for measurement.

Standard units are typically defined and maintained by internationally recognized organizations like the International Bureau of Weights and Measures (BIPM) to ensure global consistency. These organizations establish precise definitions, measurement protocols, and calibration procedures for standard units, often using advanced scientific techniques and technologies.

The use of standard units simplifies scientific research, enables accurate engineering designs, ensures fair trade practices, and facilitates international cooperation. It allows for the seamless exchange of information and data, promotes quality assurance, and supports the development of common standards and regulations in various industries.

In summary, a standard unit is a measurement rule established by authority to provide a consistent and universally accepted reference for quantifying physical quantities. It is a fundamental aspect of scientific progress, technological advancements, and global collaboration.

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The total charge in the circuit is 240 microcoulombs.

To calculate the total charge in a series circuit with capacitors, we need to use the formula Q = CV, where Q represents the charge, C is the capacitance, and V is the voltage.

In this case, we have three capacitors connected in series with capacitances of 4 μF, 3 μF, and 2 μF, respectively. The voltage across the circuit is 260 V.

To find the total capacitance (C_total) in a series circuit, we use the reciprocal rule: 1/C_total = 1/C1 + 1/C2 + 1/C3. Plugging in the values, we get 1/C_total = 1/4 + 1/3 + 1/2.

Simplifying this equation gives us 1/C_total = (3 + 4 + 6)/12 = 13/12. Taking the reciprocal, we find C_total = 12/13 μF.

Now, we can calculate the total charge (Q_total) using Q = C_total × V. Substituting the values, we get Q_total = (12/13) μF × 260 V.

Calculating the numerical value, Q_total = (12/13) × 260 = 240 μC (microcoulombs).
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Answer:

proton and neutrons

Explanation:

electron has negligible mass

Answer:

Explanation:

In case of soap film , light gets reflected from denser medium , hence interference takes place between two waves , one reflected from upper and second from lower surface . For destructive interference the condition is

2μt = nλ where μ is refractive index of water , t is thickness , λ is wavelength of light and n is an integer .

2 x 1.34 x t = 1  x 580

t = 216.42 nm .

Thickness must be 216.42 nm .

Answer: the focal length of the CCl4-glass combination is 102.31 cm

Explanation:

Given that;

Index of refraction n1 = 1.55

carbon tetrachloride (CCl4), which has n2 = 1.46

radii of curvature for its surfaces R1 = 4.6cm and R2 = 9.20 cm

the focal length of the CCl4-glass combination = ?

we can determine the focal length using the Formula;

1/f = ( n1 - n2) ( 1/R1 - 1/R)

so we substitute in our values

1/f = ( 1.55 - 1.46 ( 1/4.6 - 1/9.20)

1/f = 0.09 × 0.1086

1/f = 0.009774

f = 1 / 0.009774

f = 102.31 cm

Therefore the focal length of the CCl4-glass combination is 102.31 cm

Answer:

2 Pascal (Pa)

Explanation:

Pressure is defined as the force acting per unit area. Mathematically, it is expressed as:

Pressure (P) = Force (F) / Area (A)

Given:

Force exerted by the air inside the balloon (F) = 1 N

Area of the balloon (A) = 0.5 m^2

Plugging in the given values into the formula for pressure, we get:

P = F / A

P = 1 N / 0.5 m^2

Using basic arithmetic, we can calculate the pressure inside the balloon:

P = 2 N/m^2

So, the pressure inside the balloon is 2 N/m^2, which is also commonly referred to as 2 Pascal (Pa) since 1 Pascal is equal to 1 N/m^2.

two electrons are created from a quanta of kight

A collision at 30 mph will take any loose object in your car and give it the same force as if it were: shot from a canon.

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Answer:

Work done, W = 2 J

Explanation:

Given that,

Weight of a book, W = F = 1 N

It is lifted to a height of 2 m

We need to find the work done. It can be calculated using the formula as follows :

W = F d

Put all the values,

W = 1 N × 2 m

W = 2 J

So, 2J of work was done.

By supplying the fundamental knowledge required to create new instruments and techniques for medical use, physics enhances our quality of life

From can openers, light bulbs, and mobile phones to muscles, lungs, and brains; from paintings, piccolos, and pirouettes to cameras, vehicles, and cathedrals; from earthquakes, tsunamis, and storms to quarks, DNA, and black holes, physics aids us in understanding the workings of the world around us.

The science of physics is the most fundamental and has many applications in contemporary technology. Because it makes it possible for smartphones, computers, televisions, watches, and many other modern technologies to function automatically, physics is crucial to modern technology.

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Answer: a. It would be 140 N

I don’t know, I just got it right

When a substance changes from one phase to another, which of the following events occurs (A) The substances loses or gains heat.

A Phase change is reversible physical change that happens when a substance changes from one state of matter to the another state of matter. when substances changes from solid , liquid or gas state to different state called as phase change. Temperature can change the substance from one phase to another. for example . we can freeze the water by putting it to freezer to change it into ice and when we put it on heat it changes to liquid.

Thus, When a substance changes from one phase to another, which of the following events occurs (A) The substances loses or gains heat.

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Answer:

The substance loses or gains heat.

Explanation:

Substances can be made to change phases by fluctuating the temperature, the pressure, or both

ANSWER

3) Radius of the wraps

EXPLANATION

We want to find the factor that will not affect the strength of a solenoid.

A solenoid is an electromagnet and there are four factors that mainly affect the strength of an electromagnet:

1) The wire size;

2) The number of loops/turns;

3) The current;

4) The presence of an iron core.

Therefore, the correct option is the radius of wraps/turns (option 3) since it does not affect the strength of a solenoid.

Hi there!

We can begin by using the following formulas:

Δd = vit + 1/2at²

vf² = vi² + 2ad

v = at

We can break this problem into 2 parts:

Distance traveled with acceleration:

Δd = vi(t) + 1/2at²

The rocket starts from rest so disregard the "vi(t)":

Δd = 1/2at²

Plug in the given acceleration and time:

Δd = 1/2(29.4)(5)²

Δd = 367.5 m

Distance traveled after thrust stops:

Find the displacement up to the top of the trajectory using the equation:

vf² = vi² + 2ad, where vf = 0 m/s

Calculate the initial velocity using the equation v = at:

v = (29.4)(5) = 147 m/s

Use the above equation and plug in the given values:

0² = (147)² + 2(-9.8)d

Solve for d:

0 = 21,609 - 19.6d

19.6d = 21,609

d = 1,102.5 m

Add the two displacements:

d1 + d2 = 1,470 m

A group of students are eating in the cafeteria. As they eat, the students break down the molecules in the food, which releases the energy. They are releasing the stored chemical energy within the food, enabling their bodies to perform various activities and functions.

The correct answer is option A.

The form of energy stored in food is chemical energy. Chemical energy is a type of potential energy that is stored in the bonds between atoms and molecules within substances. When food is consumed, it undergoes a process called digestion, where complex molecules such as carbohydrates, proteins, and fats are broken down into simpler molecules such as glucose, amino acids, and fatty acids. These molecules are then further broken down through cellular respiration, a biochemical process that occurs in cells, to release energy.

During cellular respiration, the bonds within the molecules of food are broken, and their stored chemical energy is converted into a more readily usable form of energy called adenosine triphosphate (ATP). ATP is a molecule that acts as a cellular energy currency, providing energy for various cellular processes. This energy is essential for the functioning of cells, tissues, and organs in the body.

So when a group of students are eating in the cafeteria they break down the molecules in the food, which releases the energy and chemical energy is stored in the food.

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Answer:

\(\mathrm{a.\:}123\:\mathrm{kg\cdot m/s},\\\mathrm{b.\:}95\:\mathrm{kg\cdot m/s},\\\mathrm{c.\:}28\:\mathrm{kg\cdot m/s}\)

Explanation:

The momentum of an object is given by:

\(p=mv\), where \(m\) is the mass of the object and \(v\) is the velocity of the object.

a)

The mass of the child and bike together is \(19+5.6=24.6\) kilograms. Since they're moving at a velocity of 5.0 m/s, their momentum is:

\(p=24.6\cdot 5=\fbox{$123\:\mathrm{kg\cdot m/s}$}\).

b)

The mass of the child is given as 19 kg. Since the child is on the bike moving at 5.0 m/s, it's implied the child is as well. Therefore, the momentum of the child is:

\(p=19\cdot 5=\fbox{$95\:\mathrm{kg\cdot m/s}$}\).

c) The mass of the bike is given as 5.6 kg and it is moving at 5.0 m/s. Therefore, the momentum of the bike is:

\(p=5.6\cdot 5=\fbox{$28\:\mathrm{kg\cdot m/s}$}\)