Notes, summaries, assignments, exams, and problems for Physics

Motion in a Straight Line

V=u+at[V-T relation] (a=slope=∆x/∆ y=v-u/t)

S=ut+1/2at² [Position-T relation](displacement=area under V-T Graph=Area of rectangle+area of triangle)

v² =u² +2as[Position-velocity relation](displacement=area of trapezium=[a+b/2]h

S=v² -u² /2a

stopping distance: S=-u² /2a

Motion In a Plane

cosθ =Ax/A

sinθ =Ay/A

tanθ = Ay/Ax

| sin²θ+cos²θ=1|

magnitude of a vector; A= √Ax² +Ay²+Az² = √ Ax² +Ay²

substraction of vectors: A-B = A+(-B)

//logram law of vector addition :- [R=A+B][PN=Bcosθ][SN=Bsinθ] [R=√vb²+vc²+2VbVcCosθ

Time of flight:T=2usinθ/g→Full motion [uSinθ/g→half]

Max height: H=u²sinθ/2g

horizontal range:R=u²sin2θ/g [sin2θ =2sSnθCosθ]

Angular velocity/speed : ω(angular V) = ∆θ/∆t

linear... Continue reading "Physics: Motion, Laws, Work, Energy, Gravitation" »

History of Electricity

Space Exploration Vocabulary

Satellite: An artificial body placed in orbit around the Earth, Moon, or another planet to collect information or for communication.

Man-made: Caused by human beings.

Atmosphere: The envelope of gases surrounding the Earth or another planet.

Gravity: The force that attracts a body towards the center of the Earth or towards any other physical body having mass.

Space Capsule: A small spacecraft or the part of a larger one that contains the instruments or crew.

Cosmonaut: An astronaut of the Soviet or Russian space program.

Orbit (verb): To move in orbit around a star or planet.

Re-enter: To go back to a place where you were earlier or to an activity that you did or were doing earlier.

Spacecraft: A vehicle used for traveling... Continue reading "Space Exploration Vocabulary: Key Terms Defined" »

Fundamental Properties of Matter

• Matter: Everything that takes up space, has mass, and has inertia.
• Mass: The amount of matter present, measured in kg.
• Weight: Depends on gravity; it is the force of attraction that gravity exerts on a body.
• Inertia: Resistance of a body at rest to be set in motion, or the resistance of a body in motion to change speed or direction.
• Gravity: Force of attraction between objects.
• Density: The link between the body's size and its mass. Density = Mass / Volume.

Atoms and Chemical Substances

All matter is made up of atoms.

• Atoms: Made up of a nucleus, which contains protons and neutrons, and a shell, which contains electrons that are continuously moving around the nucleus.
• Chemical element: Consists of only one type of atom.

What is the Permeability of a Material and How Does it Differ from Permittivity?

Permeability (µ) measures a material's magnetic response, while permittivity (ε) measures its electric response.

Under What Condition Do Electric and Magnetic Fields Become Coupled?

Electric and magnetic fields become coupled under dynamic conditions, meaning when current, electric field, or magnetic field changes over time.

What Happens to a Waveform's Phasor When Time-Integrated?

When a waveform is time-integrated, its phasor is divided by jω.

Can Phasor Domain Equations Calculate Situations with Signals at Multiple Frequencies?

No, phasor domain equations cannot handle signals at multiple frequencies because they remove time dependence, which must be consistent... Continue reading "Electromagnetism: Key Concepts and FAQs" »

Adrian Mole: Character and Plot Analysis

• 27. Why does Pandora think Adrian's father is racist? Because an Indian family has moved into the Lucas' old house and Adrian's father says it is "the beginning of the end of our street."
• 28. What did Pandora say she had done with the money for Adrian's present? She said she had given all her money to a poor man.
• 29. Why did Pandora tell Adrian they shouldn't see each other for a while? Because they want to live their love privately.
• 30. Why is Adrian so worried about the operation to remove his tonsils? Because it is a complete shock to him and he must wait for the surgery list.
• 31. Why did Adrian burn the telephone bill at the bonfire party? Because the phone bill arrived that morning and he did not want

The first thing I would talk about is the almost repetition of the first and third stanzas. You could argue that Blake shows these two perceptions of love to demonstrate the fine line between love, being controlling and being used by another person.

I like this interpretation. If the clay says love ‘seeketh not to please itself’ and the pebble argues that love ‘seeketh only to please itself’, then they are directly opposed. Does Blake want us to choose? I think not, I think he is really trying to say that we need to avoid viewing love in these terms. Love should be selfish in the respect that we should look to our personal happiness, but at the same time we cannot be selfish and not respect the freedom of those we love.

To further this... Continue reading "Analysis of Love in William Blake's Poem" »

How Did the Universe Start?

The universe is everything that exists. Scientists estimate it could contain 100 billion galaxies. A galaxy is a large group of many stars and celestial bodies.

What Are Stars?

Stars are giant spheres of very hot gas. The Sun is the closest star to Earth.

Constellations

Constellations are visible at different times of the night. We see different constellations in the Northern Hemisphere and the Southern Hemisphere.

Types of Galaxies

Spiral galaxies are disc-shaped, with arms.

Elliptical galaxies are oval-shaped.

Irregular galaxies have no defined shape.

Solar System

Mercury, Venus, Earth, and Mars are inner planets. They are mostly made of rock.

Jupiter, Saturn, Uranus, Neptune, and Pluto are the outer planets. They are mostly... Continue reading "Exploring the Universe: Stars, Galaxies, and the Solar System" »

¡Escribe tu texto aquí!31. Define light Polarization and describe the different types of polarization that we can have.

Polarization of a light ia a process by which an unpolarized light (any light which is having its Vibration in any random direction) is changed to a polarized light (light Having waves vibrating in a particular direction). Polarization is done in Order to produce plane polarized light amd is done by reflection, refraction o Other methods.

Types of polarizaion:

 - Plane polarization.

 - Circular polarization

 - Elliptical polarization

 33- Explain the phenomenon of stimulated Emission and laser operation.

Stimulated Emission is the process by which an incoming photon of a specific frequency can Interact with an excited

Louise Hay born in metz France, to polish-jewish parents. The family immigrated to New York in 1946 after spending part of WW II as refugee in Switzerland. Louise received her B.A in mathematics from Swarthmore College in 1956 and her master's degree from Cornell University in 1959. She then took an instructorship at mount Holyoke College after her husband, whom she had married after her junior year at Swathmore, began a tenure-track position at Smith college.  In 1963 Hay returned to cornell to complete her Ph.D in math, finishing her dissertation in 1965 (after a brief interruption for the birth of twins) . She returned to Mount Holyoke as an assistant professor, the in 1968 after a divorce, movet to the university of illinois at chicago... Continue reading "Louise Hay: Trailblazing Mathematician and Educator" »