البحث عن استفسار: ٥٨٨
المحاكاة
- Balloons and Static Electricity
- Energy Skate Park: Basics (HTML5)
- Masses and Springs (HTML5)
- States of Matter (HTML5)
- Wave Interference (HTML5)
- أشباه الموصلات
- إشعاع الجسم الأسود (HTML5)
- أشكال الطاقة وتحولاتها (HTML5)
- اطالة DNA
- الأبار المضاعفة والترابط الإسهامي
- الإنتشار (HTML5)
- الاحتكاك (HTML5)
- الانشطار النووي
- البالونات والكهرباء الساكنة (HTML5)
- البصريات الهندسية (HTML5)
- التفاعلات وسرعتها(معدلها)
- التوصيلية
- الجاذبية والمدارات (HTML5)
- الحركة في بعدين
- الرجل المتحرك
- الرنين الميكانيكي
- الشحنات والمجالات (HTML5)
- الضغط (HTML5)
- العزم
- الكتلة والزنبرك: أساسيات (HTML5)
- الكتل والزنبرك
- الكثافة (HTML5)
- الليزر
- الملقط
- المناطيد والطفو
- المنحدر
- الميكروويف
- انحناء الضوء (HTML5)
- بناء ذرة (HTML5)
- بناء نواة (HTML5)
- تحلل ألفا
- تحلل بيتا
- تركيب النطاق
- تشتت رذرفورد (HTML5)
- تفاعلات قابلة للعكس
- تمثيل الاتزان (HTML5)
- إضافة المتجهات (HTML5)
- جهد البطارية
- جون ترافولتاج (HTML5)
- حالات الربط الكمي
- أساسيات حالات المادة (HTML5)
- حركة المقذوفات (HTML5)
- خصائص الغاز (HTML5)
- دائرة الإشارة
- دوران الخنفساء
- رؤية الألوان (HTML5)
- ظاهرة التأثير الكهروضوئي
- قانون أوم (HTML5)
- قانون فاراداي (HTML5)
- قانون كولوم (HTML5)
- قانون هوك (HTML5)
- لعبة التاريخ الاشعاعي
- لعبة الهوكي الكهربائية - مستلة من عمل روث تشابي
- مبادئ القوة و الحركة (HTML5)
- محرك الجزيئات
- مختبر قوة التجاذب: أساسيات (HTML5)
- مركبة الهبوط القمرية
- معمل البندول (HTML5)
- معمل قوة الجذب (HTML5)
- مقاومة سلك (HTML5)
- مقدمة الموجات (HTML5)
- موجات الراديو
- موجات الصوت
- موجة على وتر (HTML5)
- التفاعلات الذرية (HTML5)
- الطفو (HTML5)
- حساب التفاضل والتكامل (HTML5)
- نظامي الشمسي (HTML5)
- الطاقة في منتزه التزلج (HTML5)
- دارة مدخرة-مقاومة
- الطفو: المفاهيم الأساسية (HTML5)
- مختبر المكثف
- مختبر أساسيّات المكثّف (HTML5)
- ادوات بناء الدائرة: AC (HTML5)
- بناء الدائرة الكهربائية: مختبر محاكاة AC (HTML5)
- أدوات بناء الدارة الكهربائية: التيار المستمر (HTML5)
- أدوات بناء الدائرة: التيار المستمر - المعمل الافتراضي (HTML5)
- مختبر التّصادُم (HTML5)
- منحنى المناسب (HTML5)
- Davisson-Germer: Electron Diffraction
- المصابيح المفرغة
- Electric Field of Dreams
- مختبر فاراداي الكهرومغناطيسي (HTML5)
- مختبر فراداي للمغناطيس الكهربائي
- ضغط السائل والتدفق
- القوى، بعد واحد
- القوى والحركة
- Fourier: Making Waves
- فورييه: صنع الأمواج (HTML5)
- مقدمة عن الغازات (HTML5)
- مولد كهربائي (HTML5)
- البصريات الهندسية :أساسيات (HTML5)
- تأثير الاحتباس الحراري
- نماذج من ذرّة الهيدروجين
- قوانين كبلر (HTML5)
- حركة الخنفساء (ثنائي البعد)
- المغناطيس والبوصلة (HTML5)
- المغناطيسات والمغناطيسات الكهربائية (HTML5)
- لعبة المتاهة
- نماذج ذرة الهيدروجين (HTML5)
- الجزيئات والضوء (HTML5)
- Simplified MRI
- Normal Modes
- رقم الخط: المسافة (HTML5)
- Optical Quantum Control
- الاحتمالية في لعبة البلينكو (HTML5)
- مختبر بيانات المقذوفات (HTML5)
- رمي العملة الكمومي (HTML5)
- القياس الكمي (HTML5)
- Quantum Tunneling and Wave Packets
- Quantum Wave Interference
- Radiating Charge
- منحدر: القوى والحركة
- Stern-Gerlach Experiment
- جون والكهرباء الساكنة
الأنشطة
- Photoelectric Effect Phet Worksheet (AP Physics 2)
- Gas Properties Phet Simulation worksheet (AP Physics 2)
- PhET Simulations Aligned for AP Physics C
- Lab: Capacitance
- Fluid Pressure and Flow Phet Simulation worksheet
- AP Physics Orbit Lab
- AP Physics PhET Projectile Motion Lab
- Lab: Electric Field & Electric Potential
- Spring Force, Spring Constant and Elastic Potential Energy
- The physics of the triple jump
- Natural Selection - 7.2 AP BIOLOGY
- Circuit Lab 2 - Series and Parallel Circuits
- Concept questions for Physics using PhET (Inquiry Based)
- AP Physics Gravity Lab
- Lab Photoelectric Effect
- Balancing Act Homework Activity 1 and 2
- Activity: My Solar System for APP1
- Pendulum Inquiry and Lab Report
- Virtual Lab
- 2D Collision Lab
- Chaos Physics
- Maze Game 1: Using vector representations to move through a maze (Inquiry Based)
- Interactive Photoelectric Effect Lab
- Gravity Force Investigation (AP)
- Photoelectric Effect (AP)
- Gravity Force Lab PreAP using HTML5 Sim
- Conservation of Energy 2: graphs analysis
- Under Pressure
- Mapping Electric Fields
- Sound Simulation Homework II
- 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
- DC Circuit Lab
- The Two-Plate Special
- Apples in Baskets - Decomposition of 2 addends
- Salts and Solubility 2: Solubility (Inquiry Based)
- Guided Discovery (Chinese/English) for Freshman University Physics: 2. Newtonian Mechanics
- Waves on a String HTML5 PreAP Lesson
- Roller Coaster Physics Investigation
- 2.6 APES: Adaptation & Natural Selection
- Energy Skate Park Formal Lab
- Equilibrium Inquiry and Experiment Activity
- PhET Lab Energy Skate Park 2
- Reflection and Transmission Interactive Lecture
- Forca dhe levizja 2
- Maze game: 2 activities in pdf (Inquiry Based)
- Maze Game 2: Vector controls for circular motion (Inquiry Based)
- Ramp Activity 2: Calculating Net force on an incline (Inquiry Based)
- Reactants, Products, and Leftovers Activity 2: Limiting Reactants in Chemical Reactions
- Circuit Activity 2 Series & Parallel Circuits (Inquiry Based)
- Reactions and Rates 2: Intro to Kinetics (inquiry based)
- Pendulum Lab 2: Find g (Inquiry Based)
- Forces & Motion: Basics HTML5 - Part 2 (Friction)
- Vector Addition 2: Understanding Force equilibrium (Inquiry Based)
- physics is fun
- Maze Game- A Velocity & Acceleration Comparison
- Mapping of PhET and IBDP Physics
- Swinging Physics Using Pendulum Phet
- Day 2: Exploring Kinds of Circuits (Series/Parallel)
- Static Pressure
- D.C Circuit Simulation 2 - Series and Parallel
- Physics Graphing and Introduction to Models
- MYP Physics: Gravitational force vs. Distance
- Exploring Equilibrium 2 (Le Chatelier's Principle)
- Circuit activity 2 Series and Parallel Circuits using only CCK (Inquiry Based)
- Comparing and Ordering Fractins Day 2 of 3
- Projectile Motion - Physics 1 lab experiment
- Universal Gravity-building formula, quantitative with graphing
- Collision investigation lab
- Regents Physics- Projectile Motion Intro
- Exploring Equivalence with Rational Numbers: Part 2 Extending to Mixed Numbers
- MYP Physics: Electric Force vs. Distance
- Force and Motion activity 2: Relating graphs and free body diagrams using Moving Man and Forces 1D (Inquiry Based)
- Projectile Motion - Physics 1 Lab
- Designing Experiments Using Masses & Springs
- Electric fields
- Pendulum Lab
- Conservation of Mechanical Energy
- Rasyonel Sayılarda Denklik: Bölüm 2 Bileşik Kesrin Tam Sayılı Kesir Olarak Yazılması
- My Solar System
- Density Exploration
- Operon Modeling 2.0
- Chemistry - Introduction to Coulomb's Law
- PhET Energy Skate park
- Stroomsterkte in een serieschakeling
- Batterijen in serie en parallel
- Stroomsterkte voor en na een lampje
- Lampjes schakelen
- OSNOVNI ZAKON GIBANJA
- 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
- Vectors for Physics 1
- Battery-Resistor Circuit Simulation Homework III
- Charges and Fields
- Projectiles Air Resistance - It's a Drag
- Alpha Decay investigations
- Exploring the Energy Skate Park
- Physics Lab Worksheet Momentum.docx
- Gravity Force Lab
- vector addition activity
- Discovering the conservation of momentum
- Beta Decay Investigations
- Potential Difference in Circuits
- Action Potential Simulation - Guided Inquiry Activity
- Exploring Gravitation
- vector addition
- 2. Newtonov zakon
- C.A.S.T.L.E. Unit 2 Labs
- Projectile Motion Lab #2
- Capacitor and Dielectric 2
- 2. NEWTONOV ZAKON
- Forces in 1 and 2 Dimensions
- Circuit Construction Kit
- PhET Collision Lab
- Kinetic Molecular Theory- Introduction (inquiry-based)
- Vector addition worksheet
- Types of Quadrilateral
- Energy Skate Park Basics: Mechanical Energy Lab
- Undergrad MRI Workshop Activity
- Projectile Data Lab Exploratory Activity 2 of 2: Measurement with a Set of Projectiles
- LR Lab with Simulation Part 2
- Waves Virtual Lab Part 2
- PhET Lab Natural Selection 2
- Newtons 1. und 2. Gesetz
- Guided Discovery (Chinese/English) for Freshman University Physics: 3. Energy & Momentum
- Guided Discovery (Chinese/English) for Freshman University Physics: 5. Introduction to Waves
- Guided Discovery (Chinese/English) for Freshman University Physics: 1. Kinematics
- Guided Discovery (Chinese/English) for Freshman University Physics: 6. Wave Interference
- Guided Discovery (Chinese/English) for Freshman University Physics: 4. Rotations & Oscillations
- Inquiry-Based Learning Worksheet on Elasticity Using PhET Hooke’s Law Simulation
- Computer Simulations as a Tool to Assist Teaching Basics of Electromagnetism (Simulações Computacionais Como Ferramenta Auxiliar ao Ensino de Conceitos Básicos de Eletromagnetismo)
- Projectile motion
- Ispitivanje fotoelektricnog efekta pomocu PhET simulacije
- Friction Experiment
- Vectors worksheet
- Horizontal Launch Investigation
- Magnetism
- Capacitor Lab: Basics: Inquiry into Capacitor Design
- PhET Lab States of Matter Basics
- Vector Addition Worksheet
- Investigating Net Force
- Waves on a String AP1
- Reactants, Products, and Leftovers Review Activity: Limiting Reactants in Chemical Reactions Review
- Davisson Germer lecture and homework
- Quantum Wave Interference, 2 Lasers, PhET, Worksheet
- Werkblad simulatie kracht en beweging klas 2
- Atoms 2: Atomic Number and Mass Number
- Quest for the Coulomb Cup
- Finding Wave Properties
- Middle School - Electric Circuits
- Projectile Motion Experiments
- Projectile motion worksheet
- Hooke's Law inquiry lab
- Middle School - series and parallel circuits
- Visualizing Mixing with Sugar and Salt Solutions
- Gene Regulation Guided Simulation
- Gases Understanding physical properties of gases (Inquiry Based)
- Molecule Polarity - Guided Inquiry Activity
- Identifying the Limiting Reactant
- Electrolyte and Non-electrolyte Solutions - Interactive Lecture Demonstration
- Isotopes and Atomic Mass - Guided Inquiry Activity
- Gravity and Orbits-Vector Concept
- The Photoelectric Effect and Work Functions
- How to make a laser
- Electrostatics Simulation lab
- Rutherford Experiment
- Intro to Photoelectric Effect Interactive Lecture
- Density-introduction
- Circuit activity 3 Combination Circuits (Inquiry Based)
- Introduction to Discharge Lamps
- Understanding the Photoelectric Effect
- Forces and Motion: Finding the Mass of a Car
- Wave Particle Duality
- EM wave analogy tutorial
- Probability and Randomness Interactive Lecture
- Horizontal projectile motion
- Projectile Data Lab Exploratory Activity 1 of 2: Measurement with a Single Projectile
- Coeficientes e raízes das Funções do 1° e 2° Grau
- Cruce y persecución de 2 móviles con movimiento rectilíneo y uniforme (MRU)
- Projectile motion
- Projectile Motion
- projectile motion
- Projectile Motion
- Bouncing Off the Walls
- Climate Change - Gas
- Cavendish Lab
- Vector Addition
- Pixel Peeping
- Linear momentum
- Gravity Force Lab Guided Inquiry
- Milk Trucks
- Net force
- Teoria zinetikoa. Materiaren egoera fisikoak eta uraren egitura berezia.
- Guided lab with instructions, screenshots and questions
- Stern Gerlach clicker questions
- MRI lecture and homework
- Types of Forces Investigation
- Modeling Paradigm Lab- 2nd Law
- Conservation of Energy 1: Introduction (qualitative approach)
- Plate Tectonics
- Escalando Formas Actividad y Lección
- My mystery number
- Intro y laboratorio virtual de Tiro Parabólico
- Fuerzas en una rampa (actividad de indagación)
- Energy Skate Park - Concept Questions Compendium
- Pendulum Lab 1: Intro to pendulum (Inquiry Based)
- Waves Intro Remote Lab
- Fluid Experiments
- Projectile Motion - developing understanding.
- The Ramp Mechanical Advantage and Efficiency
- Projectile Motion
- Projectile Motion
- Pushing Things Around
- Greased Lightning
- Energy Skate Park Lab Questions
- Worlds of Wonder
- Simple Pendulum
- Projectile Data Lab (with CODAP) Lab 2 of 3: Firing projectiles as far as possible
- (BNCC) Coelhos, lobos e cores: o mais forte sobrevive? - Parte 2
- Projectile Motion (Lab Report)
- Energy Chains
- projectile motion
- Expresiones Algebraicas
- construye una Molécula - Formulas moleculares y coeficientes
- Wave Modeling and Wave addition (Inquiry Based)
- Exploring Equivalence with Rational Numbers: Part 1 Fractions less than or equal to 1
- Presión hidrostática por indagación
- Densidad, actividad con la simulación
- pH Scale
- Formulas y nombres de moléculas
- ¿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
- Balance in the up-and-down
- การทดลองที่ 6 คลื่นในเส้นเชือก
- Introduction to Inequalities
- Densità
- Waves Interference Remote Labs
- Intro: Gravedad y Orbitas
- Escala de pH, introducción a ácidos y bases con indagación
- Fractions 3 Day Unit
- Energy Simulation
- D.C Circuit Simulation 1
- Energy Skate Park Lab (html5)
- Photoelectric Effect
- Exploring Fission (inquiry)
- Bending Light Student Worksheet
- Crash!
- Forces and Newton's Laws Review
- Bose-Einstein Condensation Lesson
- Atomic Interactions PhET Exploration - with Coulomb's Law application
- Blackbody Spectrum
- Conservation of Energy (Energy Skate Park)
- Introduction to Fourier Analysis
- Current in DC Circuits
- Construye un átomo (indagación)
- Hook's Law
- Colission Lab colorado
- numbers game
- Exploring integers
- Introduction to vectors
- Simple Pendulum
- Explorando el equilibrio
- Introducción a los estados de la materia
- Gravity and Orbits Lesson
- Fracciones Equivalentes
- Investigation of LR Circuits
- statistical parameters
- Exploring waves on a string
- Exploring fractions
- Circuits 3 Day Unit
- Experimental Design with Forces
- Introduzione ai vettori
- Build an Atom
- Indagación con la clase entera: Ley de Beer & Lambert
- Arithmetic mean with PhET and GeoGebra
- Projectile Motion Lab
- Lunar Lander/ Fun Game
- Electromagnetic Induction
- Projectile Motion Simulator
- Electromagnetic Generation - Phet simulation
- Investigating waves
- Kinetic Molecular Theory
- Making STABLE Atoms Lab
- Lesson plan
- Vector Addition Worksheet
- Waves on a String and Wave Interference Virtual Labs
- Projectile Motion
- Photoelectric Effect
- Quantitative Predictions of Projectile Motion
- Projectile motion and horizontal component of its velocity
- Momentum Lab
- Circuits lab manual with experimental& theoretical value comparison
- Interacciones atómicas Exploración PhET
- Group data generating activity to find Lac Operon effectiveness
- Explorando ondas em uma corda
- Esplorare le onde su una corda
- การทดลองที่ 11 วงจรไฟฟ้ากระแสตรง
- Juego de numeros
- Explorando enteros
- Hablemos de temperatura
- Introdução aos vetores
- Driven Oscillation
- Equilibrio in su-e-giù
- Energía térmica y cambios de estados
- Explorando el funcionamiento de un condensador
- Fuerzas sobre un resorte
- A física do salto triplo
- Equilibrio en el sube y baja
- Balancing Chemical Reactions Game
- Introducción a los vectores
- Bailando al son de las razones
- Air Resistance Lesson
- Fuerzas sobre un resorte II
- Introduccion al campo eléctrico
- Una torta de jamón con fracciones
- Explorando fracciones
- Explorando circuitos CD
- Električni otpor i Ohmov zakon
- Introduction aux vecteurs
- Explorando ondas en una cuerda
- Multiplica la imaginacion
- Energy Skate Park Basics Lesson
- Energía Mecánica
- Aparatos de medicion electricos
- Projectile Parabolas
- Equilíbrio na gangorra
- Sonidos altos y bajos
- Balloons and Static Electricity
- Density Lesson (with Putty Lab)
- Hot Air Balloons Lesson
- Parametros Estadisticos
- Ley de Coulomb
- Media artimética con PhET y GeoGebra
- Friction lab report
- Energy Forms Simulation Activity
- La fisica del salto triplo
- Équilibre de la balançoire
- La physique du triple saut
- Explorando variables de la electricidad
- Parliamo di temperatura
- Reflexión y refracción de la luz
- La Física del salto triple
- Fenomenos magnéticos
- Matemáticas futboleras ¿y la mediana?
- Asociacion de capacitores
- Force and Motion Basics - Second grade
- Explorando circuitos RLC
- Leyes de Kirchhoff
- Introduction to Energy Model
- Circuit Lab 1 - Properties of Electric Circuits
- 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
- Coulomb's Law for Chemistry
- Atomic models homework (Inquiry based)
- Radio Waves & Electromagnetic Fields Simulation Homework
- Microwaves Simulation Activity
- Microwaves Simulation Homework
- การทดลองOnline 1 เรื่อง ลูกตุ้มนาฬิกาอย่างง่าย
- Área y Perímetro
- Equality Explorer: Homework + Class Venn Diagram
- Forces and Motion Lesson
- Natural Selection Lesson by UTeach
- simple pendulum lap
- Exploración cuantitativa de la Fuerza de Gravedad
- Simple Pendulum
- Unidad de Circuitos (actividad para 3 sesiones)
- Hoja de Actividades de Ciencias: Soluciones Ácido Base
- Percobaan gelombang pada tali
- vectors
- States Lab
- Introducción a las colisiones
- Lab Experiment
- Magnets, Electromagnets and Ohm's Law Lab!
- Photoelectric Effect
- Free-Fall and Projectile Motion
- Charges and Fields Exploration
- Forces in 1 Dimension
- Chemistry Theater
- Vectors Addition
- Serie de Labs virtuales de Ondas
- Calories Laboratory - simulate, compare, and uncover what BMI does NOT tell
- Laboratorio Virtual de Visión del Color
- Second Law Inquiry PhET Forces and Motion
- Virtual Lab - Investigating Refraction of Light
- Resistance and Resistivity
- Potential Energy of A Spring (Elastic Potential Energy)
- motion along straight line with constant acceleration
- Pendulum Energy
- PHET Charges and Fields Activity Part 1
- Modeling Gravity
- Greenhouse effect activity
- Circuit Principles and Applications
- Addition and Resolution of Vectors
- Moving Man Motion Graph Review
- Charges and Charged Objects Investigation
- Projectile launch angle vs displacement
- Hooke's Law and Spring Constant with Energy: Regular Level
- Horizontal Projectile Motion
- Beer's Law Lab: Introduction to Beer's Law
- Waves on a String Discovery Activity
- Determinine Electric Field Relationships
- The x and y's of Gas Properties
- Projectile Motion
- Serie de actividades para Electrostática: de Electrización, Campos y Fuerzas
- Introducción a Circuitos Eléctricos
- Using the Gases Intro PhET Simulation: Concept Development for Understanding Gas Laws and the Variable Changes Associated with Them
- Undersøgelse til Stoftilstande Basis
- Laboratório de Calorias - simule, compare e desvende o que o IMC não conta
- Guided Manual-Worksheet of ideal gas
- Laboratorio virtual de Condensadores
- Density
- Transcripción y Traducción
- Turning Forces
- project motion
- U1S6L2 Ley de gravitación universal
- Laboratorio virtual de reflexión y refracción de la luz
- Isótopos y Masa Atómica: Actividad de Consulta Guiada
- Activity: Wave on a String
- Rubric for Simple Pendulums - What Affects the Period?
- Ενεργειακά Διαγράμματα
- The Two-Slit Experiment
- Vector Activity
- MS and HS TEK to Sim Alignment
- Resistivity in a wire
- Kracht en Beweging. Google Quizen
- Understanding Planetary Motion using Kepler’s Laws
- Graphing Energy at the Skate Park
- Electric Field Hockey Post-Game Analysis
- Blackbody Radiation Activity
- El ruido y la contaminación acústica en mi ciudad
- Hooke's law
- Newton's Gravitational Constant Calculation
- Soluciones: Unidades de Concentración
- Virtual Lab - Circuit Basics
- Hojas de trabajo y preguntas sobre Energía
- Laboratorio virtuale di circuiti
- Kennismaken met bewegingsdiagrammen en versnelling
- Intro to Circuits
- Preguntas conceptuales: Neurona
- Waves Virtual Lab Part 1
- Construire un atome
- Moving Man with Position and Velocity graphs
- Atividade de Força e Movimento
- CD's, DVD's & Optical Commmunication: Binary Coding and Diffraction Errors
- Cinco Numeritos para Jugar
- Tectónica de placas e a abertura e expansão do fundo dos oceanos.
- Opladen door wrijving, influentie, geleiders en isolatoren - Google Quiz - guided inquiry
- Gravedad: Una fuerza invisible
- Conceptual Exploration of Heat and Temperature
- UNIDAD3 S14 L4 Ley de Ohm
- Ndertimi i qarqeve elektrike ne seri
- Energiebehoud in het skatepark klas 5
- Zekering gebruiken als beveiliging tegen Kortsluiting en overbelasting.
- (BNCC) Coelhos, lobos e cores: o mais forte sobrevive? - Parte 4
- Optical Quantum Control_Optical Pulse Shaping_PhET
- Online Assignment 4 Ms & Ss
- Medición del Ph de sustancias ácidas y básicas
- 大一物理引導式自我發現 (中文/英文): 動力學 (牛頓定律)
- Lembar Kerja Peserta Didik (LKPD) untuk Materi Gelombang Cahaya