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mezya [45]
3 years ago
9

A piston raises a weight, then lowers it again to its original height. If the process the system follows as the piston rises is

isothermal, and as it falls is isobaric, then is the work done by the gas positive, negative, or zero? Explain
Physics
1 answer:
FinnZ [79.3K]3 years ago
6 0

Answer:

Negative

Explanation:

First law of thermodynamic also known as the  law of conservation of energy states that the total energy of an isolated system is constant; energy can be transformed from one form to another, but can be neither created nor destroyed.

The first law relates  relates changes in internal energy to heat added to a system and the work done by a system by the conservation of energy.

The first law is mathematically given as ΔU  = U_{F} - U_{0} = Q - W

Where Q  = Quantity of heat

            W = Work done

From the first law The internal energy has the symbol U. Q is positive if heat is added to the system, and negative if heat is removed; W is positive if work is done by the system, and negative if work is done on the system.

Analyzing the pistol when it raises in isothermal and when it falls in  isobaric state.The following can be said:

In the Isothermal compression of a gas there is work done on the system to decrease the volume and increase the pressure. For work to be done on the system it is a negative work done then.

In the Isobaric State An isobaric process occurs at constant pressure. Since the pressure is constant, the force exerted is constant and the work done is given as PΔV.If a gas is to expand at a constant pressure, heat should be transferred into the system at a certain rate.Isobaric is a fuction of heat which is Isothermal Provided the pressure is kept constant.

In Isobaric definition above it can be seen that " Heat should be transferred into the system ata certain rate. For heat to be transferred into the system work is deinitely been done on the system thereby favouring the negative work done.

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Why does the momentum of a billiard ball rolling on a billiard table change?
stiv31 [10]

If the billiard ball is going at the constant speed and contains its mass then the momentum WONT be changing. But realistically you have external forces like friction and air resistance changing the velocity thus changing the momentum. In this case momentum is not conserved because you're introduction an external force.

8 0
3 years ago
A magnifier allows one to look at a very near object by forming an image of it farther away. The object appears larger. To creat
Mashcka [7]

In order to create a magnifier in convex lens, you should choose a short focal length that is lesser than 1 meter.

<h3>What is a convex lens?</h3>

A convex lens is also referred to as converging lens and it can be defined as a type of lens that typically causes parallel rays of light with respect to its principal axis to come to a focus (converge) and form a real image.

In Science, a magnifier refer to an optical instrument that allow us to look at a very near object because its image is generally formed farther away. Thus, the image of the object appears to be much larger.

In this context, you should choose a short focal length that is lesser than 1 meter when you want to create a magnifier in convex lens because the nearer the object is to the lens, the larger would be the image formed.

Read more on convex lens here: brainly.com/question/10153605

6 0
2 years ago
Increase of green house gases, due to human activity, is warming the oceans. This causes changes in climate. Name three Earth sp
miskamm [114]
The three earth spheres which interact in this process are THE ATMOSPHERE, THE HYDROSPHERE AND THE BIOSPHERE.
The increase in the green house gases is destroying the ozone layers of the atmosphere, this makes it possible for more ultraviolet rays to penetrate through the atmosphere unto the earth surface. The increased temperature provided by these rays is warming up the oceans and this in turn is affecting the animals and the plants that reside in the oceans and those that depend on them. These chains of activities is changing the climate of the world and is affecting all the living things that live on the earth surface.
5 0
3 years ago
PLEASE HELP!!! DUE TOMORROW
Dmitry_Shevchenko [17]
Thermal energy measures the total kinetic energy of the particles in a substance. The greater the motion of particles, the higher a substance's temperature and thermal energy. A substance's total thermal energy depends on its temperature, number of atoms, and physical state.
6 0
3 years ago
show mathematically why an 80,000 pound ( 36,000 kg ) big rig taveling 2 mph (0.89 m/s) has the SAME MOMENTUM as a 4,000 pound (
bekas [8.4K]

The momentum value for both Big rig and sport utility vehicle are the same as 16000 pound mph

<u>Explanation:</u>

Given data are as follows  

For Big rig, Mass = 80,000 pound (36,000 kg)  

velocity = 2  mph (0.89 m/s)

where mph is meter per hour

For sport utility vehicle, Mass = 40,000 pound (1800 kg)

velocity = 40 mph (18 m/s)

The formula to find the Momentum of an object is

Momentum = Mass × Velocity (Kilogram meter per second)

Momentum for Big rig = 80,000 × 2 (pound mph)

 = 1,60,000 pound mph

Momentum for sport utility vehicle = 4000 × 40 (pound mph)

 = 1,60,000 pound mph  

Hence it is mathematically proved that  

The momentum of big rig = The momentum of sport utility vehicle

1,60,000 pound mph = 1,60,000 pound mph

3 0
3 years ago
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