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1. Motion & Kinematics Q: A ball is thrown vertically upward with a speed of 20 m/s. How long will it take to reach the highest point? (Take g=10g = 10 m/s²) A:At the highest point, velocity v=0v = 0. Using the equation of motion: Answer: 2 seconds 2. Work, Power, and Energy Q: A force of 50 N is applied on a body of mass 5 kg. If the body moves 10 m in the direction of the force, what is the work done? A:Work done 3. Laws of Motion Q: A 10 kg object is moving with an acceleration of 2 m/s². What is the net force acting on the object? A:Using Newton’s Second Law: Answer: 20 Newtons 4. Current Electricity Q: A resistor of resistance 5Ω is connected to a 10V battery. What is the current flowing through the resistor? A:Using Ohm’s Law: Answer: 2 Amperes 5. Modern Physics Q: The half-life of a radioactive substance is 6 hours. What fraction of the substance remains after 18 hours?

What’s Schrödinger’s Cat, and Why Is It Both Dead & Alive? 🐱📦 Schrödinger’s Cat is a famous thought experiment in quantum mechanics. Imagine a cat inside a box with a radioactive atom, a Geiger counter, and a vial of poison. If the atom decays, the Geiger counter detects it, breaking the vial and killing the cat. If it doesn’t decay, the cat stays alive. But here’s the twist: Quantum mechanics says that until we observe the system, the atom exists in a superposition—both decayed and not decayed at the same time. Since the cat’s fate depends on the atom, it too is both dead and alive simultaneously! Only when we open the box does the superposition “collapse” into one definite state—either the cat is dead or alive. Schrödinger created this paradox to highlight the weirdness of quantum theory. In reality, large objects like cats don’t behave this way, but at the quantum level, particles do exist in multiple states until measured. This experiment challenges our understanding of reality: Does observation create reality? 🤯 Want more mind-bending science? Subscribe to O D Tutor! 🚀🔬

Electromagnetic (EM) waves are waves of electric and magnetic fields that travel through space at the speed of light. These waves do not require a medium to propagate, meaning they can travel through a vacuum (such as space). Key Properties of Electromagnetic Waves: Electromagnetic Spectrum: EM waves exist in different forms, classified by their wavelength and frequency. From longest wavelength (lowest energy) to shortest wavelength (highest energy), they include:

This is a simulation of a bar magnet and its magnetic field. Here’s what is happening: This simulation allows users to explore how a bar magnet interacts with its surroundings and how the strength and polarity of a magnet affect its magnetic field.

Acceleration is the rate at which an object’s velocity changes over time. It is a vector quantity, meaning it has both magnitude and direction. Acceleration occurs when an object speeds up, slows down, or changes direction. Formula for Acceleration: Where: Key Points to remember about Acceleration: Example: Slowing Down (Deceleration): If a bike is moving at 15 m/s and comes to a stop in 3 seconds, the acceleration (which is negative in this case) would be: Types of Acceleration: In essence, acceleration tells you how quickly and in which direction an object’s velocity is changing.

Velocity is the rate at which an object changes its position in a specific direction. It is a vector quantity, meaning it has both magnitude (speed) and direction. Velocity tells not just how fast something is moving (speed), but also in which direction it is moving. Formula for Velocity: Key Points: Example: Thus, velocity gives not only the speed (10 m/s) but also the direction (east or north in these examples). Difference from Speed: While speed measures how fast an object is moving, velocity also includes the direction of motion. For example, if a car moves at 60 km/h in a circle, its speed is constant, but its velocity is changing because its direction is continuously changing.

Distance refers to the total length of the path traveled by an object, regardless of its direction. It is a scalar quantity, meaning it only has magnitude (size) and no direction. Distance is always positive and cannot decrease as an object moves, because it represents the cumulative length of the path covered. Key Points: Example: