Why does a spinning ice skater’s angular velocity increases as she brings her arms in toward her body? When she moves her arms close to her body, she spins faster. Her moment of inertia decreases, so her angular velocity must increase to keep the angular momentum constant. Why is it harder for an ice skater […]

Why does a spinning ice skater’s angular velocity increases as she brings her arms in toward her body? When she moves her arms close to her body, she spins faster. Her moment of inertia decreases, so her angular velocity must increase to keep the angular momentum constant. Why is it harder for an ice skater

What is the force on a charge moving with velocity V? Lorentz force, the force exerted on a charged particle q moving with velocity v through an electric field E and magnetic field B. The entire electromagnetic force F on the charged particle is called the Lorentz force (after the Dutch physicist Hendrik A. Lorentz)

What is the weight of a 40 kg object? Weight of the body on Earth, (W)=mg=40×9.8=392 N. What is 40 kg on the moon? If an object has a mass of 40 kg on Earth it will have the same mass on the Moon. But, on a scale on Earth the 40 kg mass will

Why is momentum conserved in collisions? Conservation of momentum is actually a direct consequence of Newton’s third law. Consider a collision between two objects, object A and object B. When the two objects collide, there is a force on A due to B— ‍ —but because of Newton’s third law, there is an equal force

What do you call objects moving in two dimensions? This special type of two-dimensional motion is called projectile motion. Other examples of projectile motion are a ball hit by Mark McGwire, the water shot from a Super Soaker, and a daredevil’s motorcycle in mid-air. How much net force is a 2 kg object moving horizontally

What is the velocity of an object that has the momentum of 4000 kg? To calculate the velocity, we can use the formula: Velocity = Momentum / Mass Substituting the given values: Velocity = 4000 kg-m/s / 115 kg Simplifying this equation: Velocity ≈ 34.78 m/s Therefore, the velocity of the object is approximately 34.78

What’s the formula for kinetic energy? Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared. How

What is a particle moving in a horizontal circle with constant angular velocity? A particle moving in a horizontal circle with constant angular velocity. This shows that the particle is performing a uniform circular motion. Here we see that that the velocity of the particle changes at all points as its direction varies. But its

What is a 4 kg object moving across a frictionless surface with a constant velocity of? According to Newton’s First Law of Motion, the 4 kg object continues its uniform motion along the frictionless surface as a straight line with a constant velocity of 2 m/s, until an unbalanced external force is acting on it.