نتایج جستجو
۵۸۸

شبیه سازی ها

• آزمایشگاه مجازی مدار جریان مستقیم (HTML5)
• کیت ساخت مدار: جریان مستقیم (دی سی) (HTML5)
• آزمایش اشترن - گرلاخ
• آزمایش القای الکترومغناطیسی فارادی (HTML5)
• آزمایش دیویسون-گرمر: پراش الکترون
• آزمایشگاه آونگ (HTML5)
• آزمایشگاه الکترومغناطیسی فارادی
• آزمایشگاه برخورد (HTML5)
• آزمایشگاه تحلیل پرتابه‌ها (HTML5)
• آزمایشگاه خازن
• آزمایشگاه مجازی خازن: مقدماتی (HTML5)
• آزمایشگاه مجازی ساخت مدار جریان متناوب (HTML5)
• آزمایشگاه نیروی گرانش (HTML5)
• آزمایشگاه نیروی گرانش: مقدمات (HTML5)
• آشنايي با نيرو و حركت؛ اصول اولیه (HTML5)
• آهنربا و آهنربای الکتریکی (HTML5)
• آهنربا و قطب نما (HTML5)
• اثر فوتوالکتریک
• اثر گلخانه ای
• احتمال پلینکو (HTML5)
• اصطکاک (HTML5)
• امواج (مقدماتی) (HTML5)
• اندازه‌گیری کوانتومی (HTML5)
• انرژی در پیست اسکیت: مقدماتی (HTML5)
• پارک اسکیت انرژی (HTML5)
• اپتیکال کنترل کوانتومی
• بادکنک ها و شناوری
• بادکنک و الکتریسته ی ساکن (HTML5)
• بادکنک و الکتریسته ی ساکن
• بار در حال تابش
• بارها و میدان ها (HTML5)
• بازى زمان پرتوزا
• بازي گيج كننده
• برازش منحنی (HTML5)
• برهم کنش های اتمی (HTML5)
• تحت فشار (HTML5)
• تداخل امواج (HTML5)
• تداخل موج کوانتومی
• ترسیم‌گر حساب دیفرانسیل و انتگرال (HTML5)
• تشديد
• تولید موج ها
• تونل زنی کوانتومی و بسته های موج
• جرم ها و فنرها (HTML5)
• جرم ها و فنرها
• جرم ها و فنر ها: مقدمات (HTML5)
• جمع برداری (HTML5)
• حالت های ماده (HTML5)
• حالت های ماده: مقدماتی (HTML5)
• حالت های مقید کوانتومی
• حركت كفش دوزك
• حرکت در دو بعد
• منظومه شمسی من (HTML5)
• حرکت پرتابه (HTML5)
• دوران کفشدوزک
• دید رنگی (HTML5)
• رسانايي
• ساختار نواری
• سطح شیبدار
• سطح شیبدار: نیروها و حرکت
• شبیه سازی ساده ای از ام آر آی
• شكافت هسته اى
• شناوری (HTML5)
• شناوری: مفاهیم پایه (HTML5)
• شکست نور (HTML5)
• شکل ها و تبدیل های انرژی (HTML5)
• صوت
• طیف جسم سیاه (HTML5)
• فرود روی ماه
• فشار مايع و شاره
• فوریه: درست کردن امواج (HTML5)
• قانون اهم (HTML5)
• قانون فارادی (HTML5)
• قانون هوک (HTML5)
• قانون کولن (HTML5)
• قانون گشتاورها (HTML5)
• قوانین کپلر (HTML5)
• لامپ های نئون و دیگر لامپ های تخليه ی الکتريکى
• لیزر
• محلول اسيد - باز (HTML5)
• مدار باتری - مقاومت
• مدار جریان
• مد طبيعي
• مدل مساحت اعشاری (HTML5)
• مدل های اتمی برای اتم هیدروژن (HTML5)
• مدل های اتم هیدروژن
• مرد متحرک
• مقاومت یک سیم (HTML5)
• مقدمه‌ای بر گازها (HTML5)
• موتورهای مولکولی
• موج در ریسمان (HTML5)
• موج های رادیویی و میدان های الکترومغناطیسی
• مولد (HTML5)
• مولکول ها و نور (HTML5)
• موچین نوری و نرم افزار
• میدان الکتریکی
• میکروموج
• نورشناسی هندسی (HTML5)
• نور هندسی:‌ مطالب پایه (HTML5)
• نيم رسانا ها
• نیرو در یک بعد
• نیروها و حرکت
• هاكي روى چمن الكتريكي
• واتاژ باتری
• واكنش ها و سرعت ها
• واپاشی آلفا
• واپاشی بتا
• واکنش های برگشت پذیر
• ولتاژ بالا و الکتریسیته ی ساکن (HTML5)
• ولتاژ بالا و الکتریسیته ی ساکن
• ویژگی‌های گاز (HTML5)
• پخش (HTML5)
• پراکندگی رادرفورد (HTML5)
• پرتاب سکه کوانتومی (HTML5)
• پيوند کوالانسی و چاه دو تايي
• چگالی (HTML5)
• کسرها: اعداد کسری (HTML5)
• کشش دی ان ای
• کیت ساخت مدار: متناوب (HTML5)
• گرانش و مدار (HTML5)
• گشتاور
• یک اتم بسازید (HTML5)
• یک هستۀ اتم بساز (HTML5)

فعالیتها

• PhET Simulations Aligned for AP Physics C
• Activity: My Solar System for APP1
• Pendulum Inquiry and Lab Report
• AP Physics Orbit Lab
• AP Physics PhET Projectile Motion Lab
• Photoelectric Effect Phet Worksheet (AP Physics 2)
• Spring Force, Spring Constant and Elastic Potential Energy
• Projectile Motion - Physics 1 lab experiment
• Gas Properties Phet Simulation worksheet (AP Physics 2)
• Projectile Motion - Physics 1 Lab
• The physics of the triple jump
• Energy Skate Park Formal Lab
• Maze Game 1: Using vector representations to move through a maze (Inquiry Based)
• Concept questions for Physics using PhET (Inquiry Based)
• My mystery number
• Waves on a String HTML5 PreAP Lesson
• AP Physics Gravity Lab
• Family of Mr. 10
• Drag and count
• Balancing Act Homework Activity 1 and 2
• Mapping of PhET and IBDP Physics
• DC Circuit Lab
• Vectors for Physics 1
• Maze Game- A Velocity & Acceleration Comparison
• Apples in 3 Baskets
• Fluid Pressure and Flow Phet Simulation worksheet
• Ten and how many more?
• 2D Collision Lab
• Virtual Lab
• Lab: Capacitance
• Chaos Physics
• Gravity Force Lab PreAP using HTML5 Sim
• Interactive Photoelectric Effect Lab
• Gravity Force Investigation (AP)
• Photoelectric Effect (AP)
• Lab: Electric Field & Electric Potential
• Conservation of Energy 1: Introduction (qualitative approach)
• Mapping Electric Fields
• Under Pressure
• Waves on a String AP1
• Projectile Motion
• Day 1: Lighting a Bulb
• Guided Discovery (Chinese/English) for Freshman University Physics: 2. Newtonian Mechanics
• Beer's Law: An AP Chemistry Activity
• Wave Interference with Water Waves (AP)
• Algebra-based Physics Semester one lessons, clicker questions, and schedule in pdf (Inquiry Based)
• 'Lectronic Plates
• Pendulum Lab 1: Intro to pendulum (Inquiry Based)
• Natural Selection - 7.2 AP BIOLOGY
• Guided Discovery (Chinese/English) for Freshman University Physics: 1. Kinematics
• The Two-Plate Special
• Discovering Newton's Second Law
• My Solar System
• Roller Coaster Physics Investigation
• D.C Circuit Simulation 1
• PhET Energy Skate park
• Reflection and Transmission Interactive Lecture
• Exploring Equivalence with Rational Numbers: Part 1 Fractions less than or equal to 1
• Salts and Solubility 1: introduction to salts (Inquiry Based)
• Reactions and Rates 1 Introduction to reactions (Inquiry Based)
• Vector Addition 1: Introduction to vector math (Inquiry Based)
• Circuit 1 Properties of Electric Circuits (Inquiry Based)
• Lab Photoelectric Effect
• physics is fun
• Forces in 1 Dimension
• Circuit Lab 1 - Properties of Electric Circuits
• Swinging Physics Using Pendulum Phet
• Exploring the Energy Skate Park
• Horizontal projectile motion
• Forces in 1 and 2 Dimensions
• Forces and Motion activity 1: Predicting speed and directions changes (Inquiry Based)
• Ramp Activity 1: Using free body diagrams for motion on an incline (Inquiry Based)
• Reactants, Products and Leftovers Activity 1: Intro to Chemical Reactions and Limiting Reactants
• What is a Fraction? Day 1 of 3
• Physics Graphing and Introduction to Models
• MYP Physics: Gravitational force vs. Distance
• Universal Gravity-building formula, quantitative with graphing
• Collision investigation lab
• Regents Physics- Projectile Motion Intro
• MYP Physics: Electric Force vs. Distance
• Force-time graph activity
• Designing Experiments Using Masses & Springs
• Projectile Motion (Lab Report)
• Electric fields
• Pendulum Lab
• Conservation of Mechanical Energy
• Density Exploration
• Operon Modeling 2.0
• Chemistry - Introduction to Coulomb's Law
• (BNCC) Cores, Coelhos e Lobos: o mais forte sobrevive? - Parte 1
• Applied Forces and Friction and a Review of Newton's 1st and 2nd Law
• vectors
• Conservation of Energy Exploration with Skatepark Physics
• Water Waves in an Electric Sink
• Exploring Newton
• 2.6 APES: Adaptation & Natural Selection
• FRICTION_FORCES_in_1_dimension
• Charges and Fields
• Projectiles Air Resistance - It's a Drag
• การทดลองOnline 1 เรื่อง ลูกตุ้มนาฬิกาอย่างง่าย
• Alpha Decay investigations
• Static Pressure
• Introduction to Forces in 1-D
• Comparing Forces on Different Planets
• motion along straight line with constant speed
• Net Forces and Newton's Second Law
• חקר כוח חיכוך
• Force introduction
• Proving Newton's Second Law
• motion along straight line with constant speed
• Discovering Newton's Second Law
• Exploring Newtons' Second Law
• Force of Friction Graphing Ff=(mu)Fn
• Physics Lab Worksheet Momentum.docx
• Função do 1° grau
• Gravity Force Lab
• Beta Decay Investigations
• Potential Difference in Circuits
• Discovering the conservation of momentum
• Petunjuk Praktikum Kimia Umum 1 (Stoikiometri)
• Compendio de Actividades e ILDs basadas en simulaciones PhET
• Action Potential Simulation - Guided Inquiry Activity
• C.A.S.T.L.E. Unit 1 Labs
• Forca dhe levizja 1
• Atoms 1: Subatomic Particles
• Balancing act 1
• vector addition
• Exploring Gravitation
• High School Chemistry 1 level Balancing Equations
• Level 1 - Momentum Lab by Stephen N. Clontz, M. Ed.
• PHET Charges and Fields Activity Part 1
• Equilibrium Inquiry and Experiment Activity
• Circuit Construction Kit
• Kinetic Molecular Theory- Introduction (inquiry-based)
• PhET Collision Lab
• Inquiry-Based Learning Worksheet on Elasticity Using PhET Hooke’s Law Simulation
• Vector addition worksheet
• LR Lab with Simulation Part 1
• Newtons 1. und 2. Gesetz
• 1 Dimensional Motion - Kinematics and Graphing
• Waves Virtual Lab Part 1
• Inclinação e Intersecção
• Force and Motion
• 大一物理引導式自我發現 (中文/英文): 動力學 (牛頓定律)
• Undergrad MRI Workshop Activity
• Guided Discovery (Chinese/English) for Freshman University Physics: 3. Energy & Momentum
• Guided Discovery (Chinese/English) for Freshman University Physics: 6. Wave Interference
• Guided Discovery (Chinese/English) for Freshman University Physics: 4. Rotations & Oscillations
• Guided Discovery (Chinese/English) for Freshman University Physics: 5. Introduction to Waves
• Computer Simulations as a Tool to Assist Teaching Basics of Electromagnetism (Simulações Computacionais Como Ferramenta Auxiliar ao Ensino de Conceitos Básicos de Eletromagnetismo)
• Ispitivanje fotoelektricnog efekta pomocu PhET simulacije
• Projectile motion
• Capacitor Lab: Basics: Inquiry into Capacitor Design
• Friction Experiment
• Vector Addition Worksheet
• Vectors worksheet
• Magnetism
• Horizontal Launch Investigation
• Investigating Net Force
• PhET Lab States of Matter Basics
• Davisson Germer lecture and homework
• High School Chemistry 1 level: Limiting reagents
• Quest for the Coulomb Cup
• Apples in Baskets - Decomposition of 2 addends
• Finding Wave Properties
• Projectile Motion Experiments
• Projectile motion worksheet
• Middle School - Electric Circuits
• Hooke's Law inquiry lab
• Middle School - series and parallel circuits
• Gene Regulation Guided Simulation
• Visualizing Mixing with Sugar and Salt Solutions
• Gases Understanding physical properties of gases (Inquiry Based)
• Molecule Polarity - Guided Inquiry Activity
• Isotopes and Atomic Mass - Guided Inquiry Activity
• Electrolyte and Non-electrolyte Solutions - Interactive Lecture Demonstration
• Beer's Law Warm-Up
• Coeficientes e raízes das Funções do 1° e 2° Grau
• UNIDAD 1 S3 L1 MOVIMIENTO ONDULATORIO (ONDAS MECÁNICAS)
• Projectile Data Lab Exploratory Activity 1 of 2: Measurement with a Single Projectile
• Introduction to Discharge Lamps
• Rutherford Experiment
• The Photoelectric Effect and Work Functions
• How to make a laser
• Intro to Photoelectric Effect Interactive Lecture
• Electrostatics Simulation lab
• Circuit activity 3 Combination Circuits (Inquiry Based)
• Circuit Lab 2 - Series and Parallel Circuits
• Understanding the Photoelectric Effect
• Density-introduction
• Forces and Motion: Finding the Mass of a Car
• Wave Particle Duality
• EM wave analogy tutorial
• Probability and Randomness Interactive Lecture
• Linear momentum
• Projectile motion
• projectile motion
• Climate Change - Gas
• Projectile Motion
• Bouncing Off the Walls
• Cavendish Lab
• PhET Lab Energy Skate Park 2
• Vector Addition
• Pixel Peeping
• Gravity Force Lab Guided Inquiry
• Net force
• Milk Trucks
• Guided lab with instructions, screenshots and questions
• MS and HS TEK to Sim Alignment
• Waves Interference Remote Labs
• Stern Gerlach clicker questions
• MRI lecture and homework
• Types of Forces Investigation
• Modeling Paradigm Lab- 2nd Law
• Salts and Solubility 4: Using Q and LeChateliers Principle
• Salts and Solubility 5: Designer Salts (Inquiry Based)
• Fuerzas en una rampa (actividad de indagación)
• Salts and Solubility 3: Solution Equilibrium and Ksp (Inquiry Based)
• Plate Tectonics
• Waves Intro‌ Remote Lab ‌
• Intro y laboratorio virtual de Tiro Parabólico
• Energy Skate Park - Concept Questions Compendium
• Projectile Data Lab (with CODAP) Lab 1 of 3: Uncover the inner workings of mystery launchers
• Projectile Motion - developing understanding.
• Fluid Experiments
• The Ramp Mechanical Advantage and Efficiency
• Projectile Motion
• Energy Skate Park Lab Questions
• Greased Lightning
• Projectile Motion
• Pushing Things Around
• Worlds of Wonder
• Simple Pendulum
• Energy Chains
• projectile motion
• Exploring Equivalence with Rational Numbers: Part 2 Extending to Mixed Numbers
• Densidad, actividad con la simulación
• construye una Molécula - Formulas moleculares y coeficientes
• Wave Modeling and Wave addition (Inquiry Based)
• pH Scale
• Formulas y nombres de moléculas
• Presión hidrostática por indagación
• ¿Qué tan bien la curva describe los datos?
• Mass/Spring Activity
• Simple Pendulum Investigation Lesson Plan
• Radioactive Decay, Fission and Chain Reactions
• PhET Energy Forms and Changes Virtual Lab
• Projectile Motion Discovery
• Energy Simulation
• Bending Light Student Worksheet
• Energy Skate Park Lab (html5)
• Photoelectric Effect
• Crash!
• Forces and Newton's Laws Review
• Exploring Fission (inquiry)
• Balance in the up-and-down
• Introduction to Inequalities
• การทดลองที่ 6 คลื่นในเส้นเชือก
• Intro: Gravedad y Orbitas
• Escala de pH, introducción a ácidos y bases con indagación
• Fractions 3 Day Unit
• Bose-Einstein Condensation Lesson
• Kinematics
• Atomic Interactions PhET Exploration - with Coulomb's Law application
• Blackbody Spectrum
• Conservation of Energy (Energy Skate Park)
• Current in DC Circuits
• Introduction to Fourier Analysis
• Introduction to vectors
• Introducción a los estados de la materia
• Hook's Law
• numbers game
• Explorando el equilibrio
• Introduzione ai vettori
• Simple Pendulum
• Fracciones Equivalentes
• statistical parameters
• Exploring integers
• Construye un átomo (indagación)
• Gravity and Orbits Lesson
• Build an Atom
• Exploring fractions
• Experimental Design with Forces
• Indagación con la clase entera: Ley de Beer & Lambert
• Arithmetic mean with PhET and GeoGebra
• Exploración cuantitativa de la Fuerza de Gravedad
• Projectile Motion Lab
• Investigating waves
• D.C Circuit Simulation 2 - Series and Parallel
• Lunar Lander/ Fun Game
• Electromagnetic Induction
• Projectile Motion Simulator
• Electromagnetic Generation - Phet simulation
• Kinetic Molecular Theory
• Making STABLE Atoms Lab
• Lesson plan
• Vector Addition Worksheet
• Projectile Motion
• Photoelectric Effect
• Chemistry Theater
• Waves on a String and Wave Interference Virtual Labs
• Quantitative Predictions of Projectile Motion
• Projectile motion and horizontal component of its velocity
• Momentum Lab
• Interacciones atómicas Exploración PhET
• Circuits lab manual with experimental& theoretical value comparison
• Group data generating activity to find Lac Operon effectiveness
• Multiplica la imaginacion
• Fuerzas sobre un resorte II
• Equilibrio in su-e-giù
• Algoritimo da Adição usando o simulador PhET Faça um dez.
• Juego de numeros
• Equilíbrio na gangorra
• Električni otpor i Ohmov zakon
• A física do salto triplo
• Driven Oscillation
• La fisica del salto triplo
• Equilibrio en el sube y baja
• การทดลองที่ 11 วงจรไฟฟ้ากระแสตรง
• Introduction aux vecteurs
• Exploring parallel and perpendicular lines
• Media artimética con PhET y GeoGebra
• Air Resistance Lesson
• Ley de Coulomb
• Introdução aos vetores
• Explorando fracciones
• Balancing Chemical Reactions Game
• Équilibre de la balançoire
• Balloons and Static Electricity
• Explorando ondas en una cuerda
• Introduccion al campo eléctrico
• Density Lesson (with Putty Lab)
• Energy Skate Park Basics Lesson
• Energía Mecánica
• Parametros Estadisticos
• Introducción a los vectores
• Energía térmica y cambios de estados
• Explorando enteros
• Explorando el funcionamiento de un condensador
• Energia cinetica e potenziale
• La physique du triple saut
• Sonidos altos y bajos
• Hablemos de temperatura
• Fuerzas sobre un resorte
• Explorando variables de la electricidad
• Explorando circuitos CD
• Parliamo di temperatura
• Bailando al son de las razones
• Hot Air Balloons Lesson
• Reflexión y refracción de la luz
• La Física del salto triple
• Aparatos de medicion electricos
• Fenomenos magnéticos
• Matemáticas futboleras ¿y la mediana?
• Una torta de jamón con fracciones
• Asociacion de capacitores
• Explorando circuitos RLC
• Leyes de Kirchhoff
• Microwaves Simulation Activity
• Introduction to Energy Model
• Moving Man II: Acceleration vs. Time
• Moving Man I: Velocity vs. Time Graphs
• Ohm's Law, Kirchhoff's Laws, Resistors in Parallel and Series Lab
• Radio Waves & Electromagnetic Fields Simulation Homework
• Atomic models homework (Inquiry based)
• Coulomb's Law for Chemistry
• Microwaves Simulation Homework
• Hoja de Actividades de Ciencias: Soluciones Ácido Base
• Explorando líneas paralelas y perpendiculares
• Natural Selection Lesson by UTeach
• simple pendulum lap
• Simple Pendulum
• vectors
• Introducción a las colisiones
• Forces and Motion Lesson
• Percobaan gelombang pada tali
• Lab Experiment
• Magnets, Electromagnets and Ohm's Law Lab!
• PREPARATORIA: Alineación de PhET con programas de la DGB México (2017)
• SECUNDARIA: Alineación PhET con programas de la SEP México (2011 y 2017)
• Photoelectric Effect
• Modeling Gravity
• Greenhouse effect activity
• Circuit Principles and Applications
• Addition and Resolution of Vectors
• Moving Man Motion Graph Review
• Sound Simulation Homework II
• Projectile launch angle vs displacement
• Charges and Charged Objects Investigation
• Hooke's Law and Spring Constant with Energy: Regular Level
• Horizontal Projectile Motion
• Serie de Labs virtuales de Ondas
• Charges and Fields Exploration
• Guided Manual-Worksheet of ideal gas
• Free-Fall and Projectile Motion
• Vectors Addition
• Laboratorio Virtual de Visión del Color
• Second Law Inquiry PhET Forces and Motion
• Virtual Lab - Investigating Refraction of Light
• The Greenhouse Effect PhET Simulation Lab
• Resistance and Resistivity
• Introdução a Geometria molecular
• Potential Energy of A Spring (Elastic Potential Energy)
• motion along straight line with constant acceleration
• How do PhET simulations fit in my middle school program?
• Construire un atome
• Beer's Law Lab: Introduction to Beer's Law
• Waves on a String Discovery Activity
• The x and y's of Gas Properties
• Undersøgelse til Stoftilstande Basis
• Getaran Harmonik Sederhana Pada Pegas
• Projectile Motion
• Undersöka syra-bas-lösningar
• Solubilidad
• Forces and Motion- Effects of Forces on Motion (Investigation)
• Transcripción y Traducción
• Introducción a Circuitos Eléctricos
• Guided Manual-Worksheet of ideal gas
• Density
• Turning Forces
• Serie de actividades para Electrostática: de Electrización, Campos y Fuerzas
• project motion
• Laboratorio virtual de Condensadores
• Plinko Probability for Long-Run Frequencies
• Using the Gases Intro PhET Simulation: Concept Development for Understanding Gas Laws and the Variable Changes Associated with Them
• Laboratorio virtual de reflexión y refracción de la luz
• Isótopos y Masa Atómica: Actividad de Consulta Guiada
• Rubric for Simple Pendulums - What Affects the Period?
• Ενεργειακά Διαγράμματα
• Vector Activity
• Activity: Wave on a String
• The Two-Slit Experiment
• Resistivity in a wire
• Kracht en Beweging. Google Quizen
• Electric Field Hockey Post-Game Analysis
• Graphing Energy at the Skate Park
• El ruido y la contaminación acústica en mi ciudad
• Understanding Planetary Motion using Kepler’s Laws
• Kennismaken met bewegingsdiagrammen en versnelling
• Intro to Circuits
• Laboratorio virtuale di circuiti
• Using the Coulomb’s Law PhET Simulation: Concept Development for Understanding Electrostatic Forces
• Soluciones: Unidades de Concentración
• Virtual Lab - Circuit Basics
• Hojas de trabajo y preguntas sobre Energía
• Maze Game
• projectile motion worksheet
• Preguntas conceptuales: Neurona
• Hooke's law
• PHET energy forms and changes simulation worksheet to accompany simulation
• Waves Virtual Lab Part 2
• Moving Man with Position and Velocity graphs
• Atividade de Força e Movimento
• Cinco Numeritos para Jugar
• Tectónica de placas e a abertura e expansão do fundo dos oceanos.
• Projectile Motion Lab #2
• States of Matter - Lab Simulation - student procedures and questions
• Online Assignment 4 Ms & Ss
• Cirkelbeweging inleiding
• Energiebehoud in het skatepark klas 5
• Coulomb's Law Data Collection and Analysis (remote online learning)
• Zekering gebruiken als beveiliging tegen Kortsluiting en overbelasting.
• (BNCC) Coelhos, lobos e cores: o mais forte sobrevive? - Parte 4
• 大一物理引導式自我發現 (中文/英文): 運動學
• Medición del Ph de sustancias ácidas y básicas
• Lembar Kerja Peserta Didik (LKPD) untuk Materi Gelombang Cahaya