one mole of an ideal gas is expanded isothermally and reversibly from pressure of 10.0 bar to 2.00 bar at 300k. please calculate (a) the change in entropy of the system;

Answer:

1. rotation. 2. axis

Explanation:

The Earths rotation on its axis causes day and night

Answer:

D) 2L. two liters......

Answer:

The answer is 'an equinox'.

An increase in the distance between the objects causes a greater change in the gravitational force than the same increase in mass. It depends on the object's mass and acceleration due to gravity.

Mass is an intrinsic unchanging property. Weight is a force and it depends on gravitational force. This force is directly proportional to mass the more mass the object has the stronger the force of gravity will be. Because of this, it turns out that gravity does not matter when we compare the distance traveled by objects with different masses. The important part of the force is air resistance also called drag.

The slope of the graph is the relationship between weight and mass. The slope tells how many newtons of weight pull down on each kilogram of mass. Mass is the measure of the amount of matter in an object. This is an immutable property inherent in the body. Mass cannot be destroyed or created. Weight is the production of mass and acceleration due to gravity.

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Answer:

The gravitational attraction between the two masses is 24.7 N.

Explanation:

We have,

Mass of object 1, \(m_1=15\times 10^5\ kg\)            

Mass of object 2, \(m_2=20\times 10^6\ kg\)

Distance between masses is 9 m

We know that there exists a gravitational force between masses when they are placed at certain distance. The gravitational force between masses is given by :

\(F=G\dfrac{m_1m_2}{r^2}\\\\F=6.67\times 10^{-11}\times \dfrac{15\times 10^5\times 20\times 10^6}{(9)^2}\\\\F=24.7\ N\)

So, the gravitational attraction between the two masses is 24.7 N.

The unit vector in the direction of the given vector is [-1, 1/2].

A unit vector in the direction of the given vector [−56/105], we need to normalize the vector by dividing each component by its magnitude.

The magnitude of the vector [−56/105] can be calculated as:

|[-56/105]| = \(\sqrt {((-56/105)^2)\) = \(\sqrt {(3136/11025)\) =\(\sqrt {(56^2 / 105^2\)) = 56/105

Normalize the vector, we divide each component by the magnitude:

[-56/105] / (56/105) = [-56/105] * (105/56) = [-1, 1/2]

a unit vector, we divide each component of the vector by its magnitude.

Dividing [-56/105] by (56/105) yields [-56/105] * (105/56) = [-1, 1/2].

A unit vector in the direction of the given vector is [-1, 1/2]. This means that the vector [-1, 1/2] has the same direction as the original vector [-56/105], but its length or magnitude is equal to 1.

Unit vectors are useful as they represent only the direction of a vector, allowing for easy comparison and calculation without concerns for the vector's scale or magnitude.

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Answer:

The speed of the ball when it hits the ground is 102.1 m/s

Explanation:

Given;

initial velocity of ball, u = 25 m/s

distance traveled by the ball = height of the building = h = 500 m

when the ball hits the ground, the final velocity, v = ?

The final velocity of the ball is given by;

v² = u² + 2gh

where;

g is acceleration due to gravity = 9.8 m/s²

v² = (25)² + 2(9.8)(500)

v² = 10425

v = √10425

v = 102.1 m/s

Therefore, the speed of the ball when it hits the ground is 102.1 m/s

Answer:

the average speed of the ocean waves in the series is 1.5m/s

Answer:

Henry Moseley was an English physicist whose contribution to the science of physics was the justification from physical laws of the previous empirical and chemical concept of the atomic number.

The distance between the moth and its image in the mirror is equal to the distance between the moth and your eyes, which is equal to 43.7 centimeters.

The distance from the moth to its image is 16.4 cm, which is equal to 48.8 cm, because it's a plane mirror. So, if you want to know how far away from you the moth looks like it is, just subtract 48.8 cm (the distance between your eyes) from 16.4 cm (the distance between you and the moth).

The angle between these two objects is 48 degrees,

so S = 1/2  2  sin(48)

= 0.958 meters.

Moth + Mirror (dist1) + Me (dist2) = 48 * 0.958 = 43.7 centimeters

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Frequency (f) of sound waves is defined as the number of cycles of a wave that pass a point in a given unit of time. The unit of frequency is Hertz (Hz), and it is defined as the number of cycles per second (cps).

The period (T) of a sound wave is the time taken for one cycle of the wave. It is given by the inverse of the frequency of the wave.So, f = 440 Hz => T = 1/f = 1/440 secGiven, speed of sound (v) = 343 m/sSince, v = f λ, λ = v/fNow, λ = 343/440mλ = 0.78 mHence, Period of the sound wave generated by an instrument playing an A4 is 1/440 seconds and its wavelength is 0.78m.

Frequency (f) = 440 HzPeriod (T) = 1/f = 1/440 sSpeed of sound (v) = 343 m/sWavelength (λ) = v/f = 343/440m= 0.78 mTherefore, the period of the sound wave generated by an instrument playing an A4 is 1/440 s and its wavelength is 0.78 m.

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Answer:

Q=mc∆tita.

490J= m× 0.5J/Kg/C × (18-0°C)

490J= m × 9J/kg

490J

9J/Kg = m.

m= 54.4Kg

The hydrogen molecules on average have same kinetic energy but more speed.

According to the kinetic theory of gases, the kinetic energy of a gas is given by,

K = 3/2RT

Where K is the kinetic energy, R is the gas constant and T is the temperature.

From the above relation it is quite clear that the kinetic energy of a gas molecule does not depend on the mass of the molecule. It only depends on the temperature of the gas both hydrogen and oxygen are at the same temperature so both of them will have same kinetic energy.

Also the kinetic theory of gases says speed of gas molecule is given by,

V = √(3RT/M)

Here M is the mass of the gas,

The temperature of both the gases same so we can say that the speed of the gas molecule is inversely proportional to the mass of the gas molecule

In between hydrogen and oxygen hydrogen is light so it will have more speed

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The answer to the correct number of significant figures is 6.774.

When a number(big) divided smaller number, the answer obtained greater than zero is called a quotient.

Divide 143.6 ÷ 21.2

143.6/21.2 = 1436/212

                  =6.77358

The quotient is rounded to three significant figures after decimal

143.6 ÷ 21.2 = 6.774

Thus, the answer to the correct number of significant figures is 6.774

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When there is zero voltage across an ideal photocell, the amount of current that flows from the photocell is zero.

What is a photocell? A photocell is a transducer that converts light energy into electrical energy. It is also known as a photoresistor or light-dependent resistor (LDR). It is a sensor that detects light and converts it into electricity.

A photocell is a component that senses light levels and reacts to them. It is a semiconductor device that has an electrical resistance that changes depending on the amount of light it receives.

The amount of light received by a photocell is proportional to the current generated. As the light intensity decreases, the resistance of the cell increases.

The current through the circuit and the voltage across the circuit decrease when the resistance of the cell increases.The current that flows from an ideal photocell when there is zero voltage across it is zero.

The photocell produces a current proportional to the amount of light it receives. As a result, the ideal photocell has zero current when there is zero voltage across it. The photoelectric effect is responsible for the current generated by a photocell.

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The deceleration experienced by the 1075 N sky diver as he opened his parachute is 13.39 m/s²

Force = mass × acceleration

We know that deceleration is the acceleration of stopping objects. Thus,

Force (F) = mass (m) × deceleration (a)

Thus, we can obtain the deceleration of the sky diver as follow:

Force = mass (m) × deceleration (a)

1469 = 109.69 × a

Divide both sides by 109.69

a = 1469 / 109.69

a = 13.39 m/s²

Thus, the deceleration is 13.39 m/s²

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The television commercial loudness increases by 10 decibels.

The decibel (dB) scale is a logarithmic measure of sound intensity. The intensity of a sound is measured in watts per square meter and the decibel scale is a way to express the relative loudness of a sound, compared to a reference level.

A 10 dB increase in intensity is a 10-fold increase in sound power. This means that a sound with an intensity of 10 watts per square meter is 10 times louder than a sound with an intensity of 1 watt per square meter.

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The tangential speed of the tip of the bat is 2.2 m/sec.

Any item travelling in a circular direction has a tangential velocity, which is its linear speed. In one full round of a turntable, a point at the outside edge travels further than a point close to the center.

The formula for tangential velocity is given by-

\(V_{r}\) = rω

r = radius of the circular path (m)

ω = angular speed

According to the question;

The angular speed of bat is  2. 0 rad/s.

The length of the bat is equal to radius of circular path = 1.1 m.

Angular speed = angular displacement/time

ω = Ф/t

2 = Ф/t

(∵ Ф = s/r); s is the actual distance travelled.

2 = s/(r×t)

s/t = r×2

    = 1.1×2

s/t = 2.2

v = 2.2 (∵ s/t = v)

Therefore, the tangential speed of the tip of the bat is v = 2.2 m/sec.

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The momentum of an object is 720000 gm. m/s.

Given momentum of an object is 72 x 10kg. m/s.

Let's convert kg into grams (gm).

We know that 1 kg = 1000 gm.

So, momentum in grams (gm) = 72 × 10 × 1000 gm. m/s

Momentum = 720000 gm. m/s

Thus, the momentum of the object is 720000 gm. m/s.

Write the answer as follows:

The momentum of the object is 720000 gm. m/s

Explanation: Momentum is defined as the product of mass and velocity of an object. It is a vector quantity. Its unit is kg. m/s.

It can also be expressed in equivalent units such as gram. cm/s, newton-seconds (N.s), etc.

Conclusion: Thus, the momentum of an object is 720000 gm. m/s.

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Two cars collide head-on and stick together Car A, with a mass of 2000 kg then the mass of Car B is 3000 kg.

The law of conservation of momentum can be used to find the mass of Car B after the collision.

Momentum is a quantity that is conserved in an isolated system in physics.

The law of conservation of momentum states that in a system, the total momentum remains constant unless acted upon by external forces.

The initial momentum of the system is given by the sum of the momentum of Car A and Car B.

Car A has a mass of 2000 kg and is moving to the east at a velocity of 10 m/s, therefore its momentum is: Momentum of Car A = mass of Car A x velocity of Car A= 2000 kg x 10 m/s = 20,000 kg·m/s

Car B is at rest initially, so its momentum is zero.

Therefore, the initial momentum of the system is 20,000 kg·m/s.

To calculate the final momentum of the system, we need to know the mass of Car B.

Let the mass of Car B be represented by m.

The final momentum of the system is the sum of the momentum of Car A and Car B after the collision.

After the collision, the two cars stick together and move at a velocity of 5 m/s to the west.

The momentum of the system after the collision is: Momentum of system after collision = (mass of Car A + mass of Car B) x velocity of the two cars= (2000 kg + m) x (-5 m/s)

The negative sign indicates that the velocity is in the opposite direction to that of Car A, which was moving to the east.

By applying the law of conservation of momentum, we can equate the initial momentum of the system to the final momentum of the system.

That is,20,000 kg·m/s = (2000 kg + m) x (-5 m/s)

Solving for m gives: m = 3000 kg

Therefore, the mass of Car B is 3000 kg.

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Answer:

option a

Explanation:

The phase of matter

maybe this might help u

To find out how many feet per hour light travels, we need to convert miles per second to feet per hour. There are 5280 feet in a mile and 60 minutes in an hour, so we can use the following formula:

186,283 miles/second * 5280 feet/mile * 60 seconds/minute * 60 minutes/hour = 671,088,960,000 feet/hour

Therefore, light travels at approximately 671 billion feet per hour.

This is an incredibly fast speed, and it is important to note that nothing can travel faster than the speed of light. The speed of light has a profound impact on our understanding of the universe and has led to many scientific breakthroughs, including the theory of relativity. Understanding the properties of light and how it interacts with matter is crucial for fields such as optics, astronomy, and physics.

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Explanation:

The electromotive force acts when the magnetic field is applied to a current-carrying wire.

The electromotive force is given by the formula

Here, v is the velocity, q is the charge and theta is the angle between the magnetic field and direction of velocity.

The electromotive force will be maximum when the coil of wire is moving perpendicular to the magnetic field.

Thus, the correct option is a

Answer:

C. the blue colour of the Earth's sky

Explanation:

The Pleiades is a cluster of sister stars that are among the closest star cluster to earth.

The reflection nebula of the Pleiades is due to the scattering of the blue light from the hot blue luminous stars that dominate the star cluster. Th blue light is scattered from dust molecules, thought to be predominantly carbon compound like diamond dusts, and other compounds like iron.

The blue colour of the Earth's sky is the closest terrestrial phenomenon to the reflection nebula. On a clear cloudless day, molecules in the air scatter the blue component of light more than the other component colours of white light, giving the sky its characteristic blue coluor.

The common characteristics of the luminous nebula and the Earth's blue sky is that they both have their light scattered by the presence of small particles.

The velocity of the object when it hits the Earth's surface depends only on the height from which it was dropped and the acceleration due to gravity.

The velocity of an object when it hits the Earth's surface can be calculated using the principle of conservation of energy. When the object is released from rest at a distance r0 from the Earth's center, it has an initial gravitational potential energy of mgh0, where g is the acceleration due to gravity and h0 is the height of the object above the Earth's surface.

As the object falls towards the Earth's surface, its potential energy is converted into kinetic energy. When it hits the Earth's surface, all of its potential energy has been converted into kinetic energy. Therefore, we can write:

\(mgh0 = (1/2)mv^2\)

where v is the velocity of the object when it hits the Earth's surface.

Solving for v, we get:

v = sqrt(2gh0)

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Answer:  Yes, I can go and ask for them as needed

Explanation:

Answer:

A) Yes, I can go and ask for them as needed

Explanation:

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The amount of work done by the motorcycle that produces a 70 W of power in 21.0s is 3.33 Joules

Power is the quantity of energy transferred per unit time. It can be expressed as;

P = E / t

Where P is power, E is energy/work done and t is time.

Given the data in the question;

To determine the work done by the motorcycle, plug the given values into the formula above and solve for E.

P = E / t

E = P × t

E = 70kgm²/s³ × 21.0s

E = 3.33kgm²/s²

E = 3.33J

Therefore, the amount of work done is 3.33 Joules.

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Answer:

9.17 m/s^2

Explanation:

Formula for force is given by

F = m*a

where F is the force in newton

m is the mass of body in KG

and

a is the acceleration of body on m/s^2

_______________________________________________

Given

F = 11,000

mass = 1,200 Kg

we have to find value of acceleration

using

F = m*a

11,000 = 1200*a

=> a = 11,000 /1200 = 9.17

Thus, the acceleration of a car is 9.17 meter per second square