PHYSICS
COLLEGE

Answer:

Answer : The volume of engine in cubic inches is,

Explanation :

As we are given that the volume of engine is, 7.0 liters. Now we have to calculate the volume of engine in cubic inches.

Conversion used :

So,

or,

As,

So,

Thu, the volume of engine in cubic inches is,

MIDDLE SCHOOL

An apple with a mass of 0.95 kilograms hangs from a tree branch 3.0 meters above the ground. If it falls to the ground, what is the kinetic energy of the apple just as it reaches the ground?

As per the question the apple is present at a height of 3 m above the ground.

The mass of the apple is given as 0.95 kg.

Now we have to calculate the potential energy of the apple at that height. Potential energy is the energy due to the position or configuration of the the body.

Mathematically potential energy=mass of the body×acceleration due to gravity×height of the body from the ground

i.e P.E=mgh

Where m is the mass, g is the acceleration due to gravity and h is the height.

As per the question m=0.95 kg

h=3 m

And we know g=9.8 m/s^2

hence P.E=mgh

=0.95 kg×9.8 m/s^2×3m

=27.93 J

We have been asked to calculate the kinetic energy of the apple when it just reaches the ground.

Before going to solve this first we have to know that the law of conservation of energy.

It states that energy can't be created nor be destroyed.The total energy of the system is always constant.

Hence the total mechanical energy of the apple at a height of 3 m is equal to the total kinetic energy of the apple when it just reaches the ground.

Here we have neglected air resistance.

The total mechanical energy at height of 3 m is nothing else than the total potential energy of the apple at that height.

Hence K.E=P.E

⇒K.E=27.93 J [ans]

Its kinetic energy at that point will be equal to its gravitational potential energy just before the fall, given by E=mgh=0.95*9.8*3.0=27.93J

MIDDLE SCHOOL

What two roles do forensic engineers play?

Accident reconstructions and failure evaluations of vehicles and structures are the two roles that performed by forensic engineers.

What is forensic engineering?When reconstructing crimes and accidents and figuring out their causes, forensic engineering makes use of ideas from mechanical, chemical, civil, and electrical engineering. Reconstruction of auto accidents is a significant part of that effort. Forensic engineers analyze information from skid marks, damage to cars and their locations after collisions, road and environmental conditions, injuries to drivers, passengers, and pedestrians, and witness testimony to assess what might have caused the accident.

Accident reconstructions and failure evaluations of vehicles and structures are performed by forensic engineers. In order to comprehend the physical dynamics of the 1995 Oklahoma City bombing and to provide an explanation for the fall of the World Trade Center's twin towers during the September 11 attacks in 2001, forensic engineering was crucial. Police investigations into auto accidents can benefit from forensic engineering.

Learn more about forensic engineer here:

brainly.com/question/10566929

#SPJ2

The 2 roles of forensic engineers is the detective role and then the engineering role.

HIGH SCHOOL

Which elements are halogens?

Elements of Group 17 are halogens.

Fluorine, Chlorine, Bromine, Iodine, Astatine

HIGH SCHOOL

The idea that all living things are made up of cells is considered scientific law. This means the idea a)is an emerging scientific idea that has a logical explanation.

b)has been tested with similar results at least twice.

c)is supported by scientific consensus and a large amount of evidence.

d)has been rejected only once by the scientific community.

Answer:

c) is supported by scientific consensus and a large amount of evidence.

Explanation:

Robert Hooke discovered the cell in 1665. Later, Matthias Jakob Schleiden and Theodor Schwann developed cell theory around 1839. Cell theory stated that:

All living organisms have cells.

It is the primary unit of structure of life.

They are born from older cells.

This is considered as law due to consensus and a large amount of evidence.

Is supported by scientific consensus ect

COLLEGE

A small jet airplane has a total wing area of 77.5 m2 and a mass of 7.23 104 kg. (a) If this jet is in horizontal flight, determine the pressure difference between the lower and upper surfaces of the wings.

To solve this problem we must simply resort to Newton's second law as well as the relationship between pressure and force as a physical unit applied in a given area.

In mathematical terms the Weight can be expressed as

Where,

m = mass

g = Gravitational Acceleration

We have the mass and the gravitational acceleration therefore the Weight is

Replacing we have

In this way the pressure exerted according to the active Area is,

Therefore the pressure difference between the lower and upper surface of the wings is 9.14kPa

HIGH SCHOOL

A certain amount of a monatomic gas is maintained at constant volume as it is cooled by 50K. This feat is accomplished by removing 400 J of energy from the gas. How much work is done by the gas? a) 400 J

b) -400 J

c) zero

d) none of the above

Answer:

The correct answer is option a. 400J

Explanation:

Hello!

Let's solve this!

To know if the work is positive or negative we have to know the following:

The work is positive when the gas performs (expansion)

The work is negative when done outside on the gas (compression)

In this case the work is done by the gas, so it is positive.

The correct answer is option a. 400J

HIGH SCHOOL

Which of the choices below gives a true example of how a natural resource can be renewed? A. When all of the coal is gone from a mine, new coal can be grown in its place. B. When forests have been cut down, new native trees can be planted. C. When an area's natural gas has been used up, oxygen can replace the gas. D. When the Sun is hidden behind clouds, lamps can be used to power solar cells.

B.

the others just don't make sense...

the others just don't make sense...

COLLEGE

How are Raleigh scattering and Compton scattering different?

Answer:

Rayleigh scattering is an optical phenomena where blue light is scattered and Compton scattering is the dispersion of radiation with a greater wavelength after the collision between a foton and an electron.

Explanation:

The Compton scattering is related to electromagnetic radiation that incides on electrons, this radiation after hitting an electron is dispersed with a wavelength greater than the original. In this phenomenon the conservation of the linear momentum and the conservation of energy are applied to analyze the clash between the photon and the electron.

And the rayleigh scattering is the dispersion of light due to air molecules, this dispersion is more effective for small wavelengths (the blue part of the spectrum).

So the difference is that the Compton scattering has to do with collisions between particles, photons and electrons, and the rayleigh scattering is an optical phenomenon of white light scattering, where mainly the blue part of the spectrum is scattered and is used to explain, among other phenomena, the blue color of the sky.

Answer:

Rayleigh would be where blue light would be scattered and then compton scattering has a radiation that produces higher wave lengths apposed to rayleigh

COLLEGE

A container is ﬁlled with water to a depth of 26.2 cm. On top of the water ﬂoats a 16.1 cm thick layer of oil with a density of 0.85 × 103 kg/m3. The acceleration of gravity is 9.81 m/s2 . a) What is the pressure at the surface of the water? Answer in units of Pa.

Answer:

1.34 x 10^3 Pa

Explanation:

density of oil = 0.85 x 10^3 kg/m^3

g = 9.81 m/s^2

height of oil column = 16.1 cm = 0.161 m

Pressure on the surface of water = height of oil column x density of oil x g

= 0.161 x 0.85 x 10^3 x 9.81 = 1.34 x 10^3 Pa

Thus, the pressure on the surface of water is 1.34 x 10^3 Pa.