Physics Fundamentals

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Questions and Answers

A spacecraft is traveling at 0.9c (90% of the speed of light). Which framework is most appropriate for accurately modeling its motion?

Classical Mechanics
Relativistic Mechanics (correct)
Quantum Mechanics
Fluid Dynamics

Which of the following scenarios would necessitate the use of quantum mechanics over classical mechanics?

Calculating the orbit of a satellite around Earth.
Modeling the motion of a pendulum.
Analyzing the behavior of electrons in a semiconductor. (correct)
Predicting the trajectory of a baseball.

A rigid body is rotating around a fixed axis. Which quantity determines the resistance of the body to changes in its rotational speed?

Moment of Inertia (correct)
Angular Velocity
Torque
Angular Momentum

A simple pendulum is released from a small angle. What is the primary factor that determines the period of its oscillation?

The length of the pendulum (B) Signup and view all the answers

Two objects collide in an isolated system. Which of the following quantities is always conserved in this collision?

Momentum (B) Signup and view all the answers

A projectile is launched at an angle above the horizontal. Ignoring air resistance, at what point in its trajectory is its speed minimized?

At the highest point of its trajectory (A) Signup and view all the answers

A car is moving at a constant speed around a circular track. What is the direction of the net force acting on the car?

Radially inward, towards the center of the circle (C) Signup and view all the answers

How does Lagrangian mechanics differ from Newtonian mechanics in its approach to solving problems?

It uses energy and the principle of least action. (A) Signup and view all the answers

A mass is attached to a spring and undergoes simple harmonic motion. If the spring constant is increased, how does the frequency of oscillation change?

It increases. (A) Signup and view all the answers

According to classical mechanics, what property of time is assumed?

Time is absolute and universal for all observers. (C) Signup and view all the answers

A block slides down a frictionless inclined plane. What remains constant throughout the block's motion?

The block's acceleration (B) Signup and view all the answers

A ball is thrown vertically upwards. Considering air resistance, what happens to the ball's acceleration at its highest point?

The acceleration is equal to $g$ (gravitational acceleration) and directed downwards (C) Signup and view all the answers

Two cars with different masses collide head-on inelastically. Which car experiences the greater magnitude of impulse during the collision?

Both cars experience the same magnitude of impulse (B) Signup and view all the answers

A skater spins faster when they pull their arms closer to their body. Which principle explains this phenomenon?

Conservation of angular momentum (C) Signup and view all the answers

A satellite orbits the Earth in a circular path. If the satellite's orbital radius is doubled, what happens to its orbital period?

It is increased by a factor of $2\sqrt{2}$ (D) Signup and view all the answers

A simple pendulum is set into oscillation. How does the tension in the string at the bottom of the swing compare to the weight of the pendulum bob?

The tension is greater than the weight (A) Signup and view all the answers

A particle moves under the influence of a conservative force. Which of the following quantities is conserved?

Total mechanical energy (C) Signup and view all the answers

A car accelerates uniformly from rest. What is the relationship between the car's displacement and time?

Displacement is proportional to the square of time (C) Signup and view all the answers

In a collision between two objects, what condition must be met for kinetic energy to be conserved?

The collision must be elastic (C) Signup and view all the answers

A bicycle wheel is rotating. If the angular velocity is doubled and the moment of inertia is halved, what happens to the rotational kinetic energy?

It is doubled (D) Signup and view all the answers

Flashcards

Classical Mechanics

Describes motion of macroscopic objects at speeds much slower than light.

Newton's First Law (Inertia)

A body remains at rest or in uniform motion unless acted upon by a net force.