as a simple pendulum swings back and forth, the forces acting on the suspended object are the gravitational force, the tension in the supporting cord, and air resistance. (i) which of these forces, if any, does no work on the pendulum at any time? (select all that apply.)

2.939 × 10²⁴ molecules were released from the tank. We use the ideal gas law equation to determine the number of molecules released.

To determine the number of molecules released when the air pressure in a tank is reduced, we can use the ideal gas law equation, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

PV = nRT

28.0 atm = \(28.0 \times 1.01325 \times 10^5 Pa = 2.8394 \times 10^6 Pa\)

14.9 atm = \(14.9 \times 1.01325 \times 10^5 Pa = 1.5077 \times 10^6 Pa\)

1.00 m³ = 1000 liters

T = 273 K

Using the ideal gas law to calculate the initial number of moles:

\(n_1 = (P_1 \times V) / (R \times T)\\ = (2.8394 \times 10^6 Pa \times 1000 L) / (8.314 J/(mol \cdot K) \times 273 K)\\= 128.76 mol\)

\(n_2 = (P_2 \times V) / (R \times T) \\= (1.5077 \times 10^6 Pa \times 1000 L) / (8.314 J/(mol \cdot K)\times 273 K) \\ = 79.93 mol\)

Number of moles = 128.76 mol - 79.93 mol = 48.83 mol

Number of molecules

\(= 48.83 mol \times 6.0221 \times 10^{23} molecules/mol\\ \approx 2.939 \times 10^24 molecules\)

Therefore, approximately 2.939 × 10²⁴ molecules were released from the tank.

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The velocity of the object when it hits the ground is -29m/s (option C).

Velocity is a vector quantity that denotes the rate of change of position with respect to time, combining speed with a directional component.

The velocity of a moving object can be calculated using the following equation of motion;

v = u + at

According to this question, an object is dropped from a tall building and hits the ground 3.0 s later. Since the velocity is downwards, the equation will change to:

v = u - gt

v = 0 - (9.8)(3)

v = 0 - 29.4

v = -29m/s

Therefore, -29m/s is the velocity of the object falling from the tall building.

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The image of a shoplifter in a department store being viewed in a convex (diverging) mirror so the image of the shoplifter will appear smaller, upright, and virtual. This is because convex mirrors are designed to provide a wider field of view, making it easier for store staff to monitor potential shoplifters.

If the cut part of the hollow sphere is painted from the inside, then its outer surface becomes the reflecting surface. This kind of mirror is known as a convex mirror.

A convex mirror is also known as a diverging mirror as this mirror diverges light rays when they strike its reflecting surface.Virtual, erect, and diminished images are always formed with convex mirrors, irrespective of the distance between the object and the mirror.

So, convex mirrors are designed to provide a wider field of view, making it easier for store staff to monitor potential shoplifters.

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Answer

Explanation:

Simple arithmetic cannot be used if two or more vectors are not along the same direction. Vectors can be added when two vectors are in the same direction but for the subtraction of vectors, if the vectors are not in the same direction you then subtract.

Answer:

F = 1.25 N

Explanation:

The equation to calculate Gravitational Force is

F = G (m1 . m2) / r^2

where G is gravitational constant, m1 and m2 are the mass of the 2 objects.

So, assuming that the G, m1, m2 is constant, the equation will be

F1 . \(r1^{2}\)= F2 . \(r2^{2}\)

Therefore,

F2 = F1 .  \(r1^{2}\) /      \(r2^{2}\)

And finally we just need to find F2 by inserting this value

F1 = 5N

r1 = 10m

r2 = 20m

I hope you can understand, let me know if you need more explanation.

Answer:

Sorry if I kwon the

answer I telling u

the answer sorry

Answer:

A DC generator is the same as a(n)

C. armature

The goal of the campaign Mayor White started in 2008 was to reduce the pollution in the country and to use eco friendly resources for the environment.

Mayor white started a campaign to reduce pollution in Houston  he made a local factories and oil refineries reduce pollution he work to reduced the impact of energy consumption in the Houston he increase the use of solar energy in the city.

He introduced solar panels on several city buildings Houston is a country were Sun shines a lot so capturing the sun energy is the easy method. The energy produced by the sun will not produce any kind of pollution which is produced by coal gas or oil and this energy can be stored in batteries and can be used at nights people in this country

The people also  understood the need of solar energy and the impact of pollution which is caused in earth and environment.

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The final velocity of the system is 1.5 m/s. Therefore, the correct option is D) 1.5 m/s.

According to the conservation of momentum principle, if there are no external forces acting on a system, then the total momentum of that system is conserved. Hence, if a system has an initial momentum of P(initial), and the momentum is changed to P(final), then the change in momentum of the system (ΔP) must be equal to the impulse that causes this change.ΔP = P(final) - P(initial)By definition, impulse is the product of the force and the time interval for which it acts.ΔP = F•t where F is the force applied, and t is the time interval for which it acts.

Now, coming to the problem. The initial momentum of the system is P(initial) = m•v where m is the total mass of the system and v is its initial velocity. After the CO2 gas is ejected, the final momentum of the system is P(final) = m•v' where v' is the final velocity of the system. The mass of the person, chair, and cylinder is 80 kg, and the ejected CO2 gas has a mass of 2 kg. Hence, the total mass of the system is 82 kg. Initial momentum of the system, P(initial) = m•v = 82 kg × 0 = 0 kg•m/s

The CO2 gas is ejected with a speed of 60 m/s, and its mass is 2 kg. Hence, its momentum is, P(CO2) = m•v(CO2) = 2 kg × 60 m/s = 120 kg•m/s By the conservation of momentum principle, the change in momentum of the system (ΔP) must be equal to the impulse that causes this change.ΔP = P(final) - P(initial)Impulse, I = ΔP = P(final) - P(initial)The force applied, F is given by, F = I/t where t is the time interval during which the force acts. We need to determine the final velocity of the system after the gas is ejected. Let us assume that the ejected CO2 gas exerts a force F on the person-chair-cylinder system. The force acts on the system for a time t. Hence, the impulse I is,I = F•t

We know that, I = ΔP = P(final) - P(initial) Therefore, F•t = m•v' - 0which gives, F•t = m•v' Therefore, v' = (F•t) / m. The mass of the person, chair, and cylinder is 80 kg. Hence, the mass of the CO2 gas ejected is 2 kg. Therefore, the total mass of the system is 82 kg. The force exerted by the ejected CO2 gas on the system, F, is given by, F = m(CO2) • v(CO2) / t where m(CO2) is the mass of the ejected CO2 gas, v(CO2) is its speed, and t is the time during which the force acts. F = 2 kg × 60 m/s / t = 120 / t N Therefore, v' = (F•t) / m= (120 / t) × t / 82= 1.4634 m/s Approximately, the final velocity of the system is 1.5 m/s, which is closest to option D. Therefore, the correct option is D) 1.5 m/s.

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The thermometer measures the starting temperature as,

The temperature required for the boiling the water is

(a). The temperature requires to boil is,

The prove of  Angle XYZ- Angle NYM is given below:

Note that from the image given;

Since ∠XYZ is said to be congruent to ∠NYM it can be proven by the use of the reflexive property.

The reflexive property is one that informs that any shape is regarded congruent to itself.

Since ∠NYM has a different way to call ∠XYZ that uses a different vertexes, but the sides are made up of the two angles which are said to be the same.

Therefore , ∠XYZ ≡ ∠NYM are proved by the reflexive property.

Since ΔXYZ is the same with Δ NYM, it can be proven by the AA (angle-angle) similarity theorem.

We have 2 angles Δ XYZ and Δ NYM:

Note that ∠YXZ ≡ ∠YNM

              ∠XYZ ≡ ∠NYM

So,  ΔXYZ is said to be the same to ΔNYM and it is proven by the AA similarity theorem.

Therefore, The prove of  Angle XYZ- Angle NYM is given below:

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Answer:

1. parrael

2. corresponding angles theorem

3. NYM

4. AA

Explanation:

just took it

Answer:

D. Yes, because heat will not stop flowing until both objects reach the same temperature.

To determine the diameter of the cylindrical rod that can withstand a load of 650 N, we need to consider the yield strength of the material and the applied load. the diameter of the rod is approximately 11.62 mm.

By using the formula for stress (force divided by area) and rearranging it to solve for the diameter, we can find the required diameter of the rod.

The stress experienced by the rod can be calculated using the formula:

Stress = Force / Area

Given that the yield strength of the steel is 310 MPa, we can set up the equation:

310 MPa = 650 N / (π * (diameter/2)^2)

We can rearrange the equation to solve for the diameter:

diameter = √(650 N / (310 MPa * π)) * 2

Substituting the given values, we find:

diameter ≈ √(650 / (310 * 10^6 * π)) * 2 ≈ 11.62 mm

Therefore, the required diameter of the rod to withstand the load is approximately 11.62 mm.

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Answer: c. and a

Explanation:

Answer:

Replication of the DNA must occur. Segregation of the "original" and its "replica" follow. Cytokinesis ends the cell division process. Whether the cell was eukaryotic or prokaryotic, these basic events must occur.

The gravitational attraction of the Earth to the Sun is much greater than the attraction of the Moon to Earth due to the Sun's significantly larger mass and the greater distance between the Earth and the Sun compared to the Earth and the Moon.

The statement that the gravitational attraction of the Moon to Earth is greater than the attraction of Earth to the Sun is incorrect. In reality, the gravitational attraction between the Earth and the Sun is significantly stronger than the attraction between the Moon and the Earth.

The strength of the gravitational force between two objects depends on two factors: the mass of the objects and the distance between them.

The mass of the Sun is about 330,000 times greater than the mass of the Earth, while the mass of the Moon is much smaller, only about 1/80th the mass of the Earth. So, in terms of mass, the Sun has a much larger gravitational influence on the Earth than the Moon does.

Furthermore, the distance between the Earth and the Sun is about 93 million miles (or 150 million kilometers), whereas the average distance between the Earth and the Moon is about 238,900 miles (or 384,400 kilometers). The greater the distance between two objects, the weaker the gravitational force between them.

Considering both the mass and the distance, the gravitational attraction between the Sun and the Earth is about 180 times stronger than the gravitational attraction between the Moon and the Earth.

The gravitational force between the Sun and the Earth is what keeps the Earth in its orbit around the Sun, causing the Earth to experience a centripetal force that prevents it from drifting away into space. On the other hand, the gravitational force between the Moon and the Earth is responsible for the Moon's orbit around the Earth and phenomena like tides.

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The statement that the gravitational attraction of the Moon to Earth is greater than the attraction of Earth to the Sun is actually incorrect. In reality, the gravitational attraction between the Earth and the Sun is much stronger than the attraction between the Moon and the Earth.

The force of gravity between two objects depends on two factors: the mass of the objects and the distance between them. The Sun is significantly more massive than both the Earth and the Moon. Its mass is about 330,000 times greater than that of the Earth and approximately 27 million times greater than the mass of the Moon.

Although the Moon is much closer to the Earth than the Sun, the Sun's enormous mass compensates for the distance. As a result, the gravitational force between the Earth and the Sun is about 180 times stronger than the force between the Moon and the Earth.

The Moon's gravitational pull does have significant effects on Earth, such as creating ocean tides and causing the Earth's rotation to slow down gradually.  However, in terms of sheer gravitational strength, the Sun's influence on the Earth is far more dominant due to its immense mass.

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Answer:

base

Explanation:

I hope this helps

Answer:base

Explanation:

Answer:

wouldn't it be 17km?

Explanation:

Since its 10km and 7km it would make 17km in total. sorry if this didnt help i suck at this stuff :/

Since the displacement is equal to zero, the velocity from 30 to 40s will also be zero.

Velocity is the distance travelled by a body in a specific direction per time taken. It is measured in meter per second. That is, m/s

Given that a car started its journey at point A. After 30 seconds, the car had reached point B. The car stops at point B for 10 seconds. Then, the car turned around and arrived at point A after 15 seconds. The car stopped at point A for 20 seconds. The car then went on his way and get to the point C after 10 seconds.

To find the velocity from 30 to 40s, we must realize that velocity can also be defined as;

Velocity = displacement / time

The displacement from point A to B and back to A is equal to zero.

Therefore, The velocity from 30 to 40s is also zero.

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Answer:

It doesn’t it may burn the road a little but nothing much other than that I can think ok

Explanation:

Answer:

OA. . review all safety procedures and the lab activity procedure

Explanation:

Answer:

12.01

Explanation:

Given parameters:

Abundance of C-12  = 98.89%

mass of isotope  = 12amu

Abundance of C - 12  = 1.11%

mass of isotope  = 13.003

Unknown:

Average atomic mass of carbon  = ?

Solution:

The average atomic mass ;

R.A.M  = (mass of isotope x abundance of isotope)-12 + (mass of isotope x abundance of isotope)- 13

Insert the parameters and solve;

R.A.M  =( 12  x 98.89%)  + (1.11% x 13.003)

 R.A.M = 11.87 + 0.14 = 12.01

Contact pressure occurs due to the contact between two distinctive objects. Non-contact pressure happens due to either appeal or repulsion between two objects such that there is no contact between these objects. There is no area linked with the contact force.

A non-contact pressure is any force applied to an object via another body without any contact. For example, magnetic force, gravitational pressure and electrostatic force.

Force utilized through direct touching an object is called contact force. Like me pushing a wall i.e. muscular pressure or frictional pressure etc.

A force that can purpose or change the movement of an object by means of touching it is referred to as Contact Force. For example, muscular force,frictional force,spring force,tension force,air resistance pressure etc.

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Each gamma-ray photon resulting from the annihilation of a proton and an antiproton carries an energy of 938.3 MeV (megaelectron volts).

When a proton and an antiproton annihilate, they convert their mass into energy according to Einstein's famous equation, E = mc^2. The rest mass of a proton is approximately 938.3 MeV/c^2. Therefore, when a proton and an antiproton annihilate, their combined mass of 2 * 938.3 MeV/c^2 is converted entirely into energy.

Since two gamma-ray photons are emitted during the annihilation, each gamma-ray photon carries half of the total energy. Thus, each gamma-ray photon has an energy of 1/2 * 938.3 MeV = 469.15 MeV.

Converting MeV to eV (electron volts), we multiply by a factor of 10^6. Therefore, each gamma-ray photon resulting from the proton-antiproton annihilation has an energy of approximately 469.15 MeV * 10^6 eV/MeV = 4.6915 * 10^8 eV.

Hence, each gamma-ray photon has an energy of approximately 469.15 million electron-volts (eV).

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Answer: B

Explanation:

Heating up objects makes them expand, this is called thermal expansion and is due to the fact that the molecules of the object are now moving faster than before and thus are further away from each other. The same logic applies to cooling down objects. Cooling down objects makes them contract due to the fact that the molecules of the object are now slower than before and thus get closer to each other.

If the temperature of ice at 0 degrees Celsius is decreased, the volume of the ice will decrease. Hence the correct answer is b.

This is because water undergoes a phase change from a solid to a liquid as it warms up, and a phase change from a liquid to a solid as it cools down. When water freezes, its molecules arrange themselves into a rigid, crystalline structure with a fixed volume.

As the temperature of the ice is lowered, the molecules move less and less, and the attractive forces between them become stronger, causing the ice to contract and occupy less volume.

Therefore the correct option is B

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Because they are placed in different habitable zones