Torque and Moment of Inertia Quiz

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Questions and Answers

What occurs when two waves are in phase?

  • Thermal expansion
  • Constructive interference (correct)
  • Doppler effect
  • Destructive interference

What happens to the resultant amplitude during destructive interference?

  • It doubles in size.
  • It is equal to the sum of the two amplitudes.
  • It is equal to the difference between the two amplitudes. (correct)
  • It becomes negative.

What is the apparent effect observed for an observer as the source of waves approaches?

  • Apparent upward shift in frequency (correct)
  • Increase in amplitude
  • No shift in frequency
  • Apparent downward shift in frequency

How is specific gravity related to an object’s buoyancy in water?

<p>Greater than one means it will sink. (B)</p> Signup and view all the answers

As you go deeper in a fluid, what happens to the pressure?

<p>Pressure increases. (C)</p> Signup and view all the answers

What does Pascal's law state about confined fluids?

<p>Force applied is transmitted uniformly in all directions. (C)</p> Signup and view all the answers

According to Archimedes’ principle, which force acts on a submerged object?

<p>Buoyant force upwards (D)</p> Signup and view all the answers

What describes Bernoulli's Principle?

<p>High fluid velocity correlates with low pressure. (C)</p> Signup and view all the answers

What does the Zeroth Law of Thermodynamics establish?

<p>Systems in thermal equilibrium with a third system are also in thermal equilibrium with each other. (C)</p> Signup and view all the answers

Which statement best defines thermal expansion?

<p>Most materials expand when their temperature is increased. (C)</p> Signup and view all the answers

What is the formula for weight according to Newton’s second law?

<p>w = mg (A)</p> Signup and view all the answers

Which of Kepler's laws states that planets move in elliptical orbits with the sun at one of the foci?

<p>The law of orbits (C)</p> Signup and view all the answers

What describes the repeated motion of a system from its equilibrium position?

<p>Oscillatory motion (B)</p> Signup and view all the answers

In a gravitational field, what is the strength of the field on Earth?

<p>9.8 N/kg (D)</p> Signup and view all the answers

Which of the following correctly describes damping?

<p>The decrease in amplitude of oscillation (D)</p> Signup and view all the answers

According to the law of areas, what does a line drawn from the sun to a planet do in equal time intervals?

<p>Sweeps equal areas (D)</p> Signup and view all the answers

What is the relationship described by the law of periods in Kepler’s Laws?

<p>The squares of periods are proportional to cubes of distances from the sun (A)</p> Signup and view all the answers

What type of motion involves a body rotating around an internal axis?

<p>Rotational motion (B)</p> Signup and view all the answers

What is the turning effect of a rigid body known as?

<p>Torque (C)</p> Signup and view all the answers

What serves as the single point in which the weight of an object is concentrated?

<p>Center of Gravity (C)</p> Signup and view all the answers

What characterizes undamped oscillations?

<p>Amplitude remains constant. (B)</p> Signup and view all the answers

Which condition describes an oscillator returning to equilibrium without oscillating, but slower than critically damped?

<p>Over damped (D)</p> Signup and view all the answers

How does a longitudinal wave differ from a transverse wave?

<p>Particles move parallel to the wave direction in longitudinal waves. (B)</p> Signup and view all the answers

What defines the frequency of a wave?

<p>The number of cycles in a given time frame. (B)</p> Signup and view all the answers

Which of the following best describes the principle of superposition?

<p>Total displacement at a point is the sum of individual wave displacements. (B)</p> Signup and view all the answers

What is a characteristic of a critically damped condition?

<p>Returns to equilibrium without any overshoot. (C)</p> Signup and view all the answers

What is the relationship between wavelength and frequency?

<p>Wavelength increases with decreasing frequency. (B)</p> Signup and view all the answers

What does a sine wave represent in its simplest form?

<p>A periodic oscillation following a sine curve. (C)</p> Signup and view all the answers

Which of the following accurately defines a cycle in a sine wave?

<p>The complete event from maximum to zero energy. (C)</p> Signup and view all the answers

What types of media can transverse waves travel through?

<p>Only solids (A)</p> Signup and view all the answers

What does the coefficient of thermal expansion measure in a material?

<p>The increase in volume per unit of original volume per degree rise in temperature (D)</p> Signup and view all the answers

Which thermodynamic process keeps the pressure constant?

<p>Isobaric process (D)</p> Signup and view all the answers

According to Boyle's Law, what relationship is observed between gas volume and pressure at a constant temperature?

<p>Volume decreases as pressure increases (A)</p> Signup and view all the answers

What is a key characteristic of an ideal gas?

<p>It occupies negligible volume compared to its container (C)</p> Signup and view all the answers

In an adiabatic process, which of the following occurs?

<p>The system does not exchange heat with its surroundings (D)</p> Signup and view all the answers

Which of the following is true regarding the second law of thermodynamics?

<p>Heat flows spontaneously from higher temperature to lower temperature (C)</p> Signup and view all the answers

What defines an irreversible process?

<p>The system does not return to its original state once initiated (C)</p> Signup and view all the answers

What can be inferred about the entropy in an isolated system?

<p>Entropy can never decrease (B)</p> Signup and view all the answers

What does the combined gas law (PV = nRT) describe?

<p>The relationship between pressure, volume, and temperature of a single gas sample (C)</p> Signup and view all the answers

Which process is exemplified by boiling water in a closed container?

<p>Isochoric process (A)</p> Signup and view all the answers

Flashcards

Constructive Interference

When two waves are in phase, their amplitudes add up, creating a larger resultant wave.

Destructive Interference

When two waves are out of phase (antiphase), their amplitudes subtract, resulting in a smaller resultant wave.

Doppler Effect

A change in perceived frequency of waves (like sound or light) when the source and observer are moving relative to each other.

Density

Mass per unit volume.

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Specific Gravity

Ratio of an object's density to the density of water.

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Pressure

Force per unit area.

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Pascal's Law

Pressure applied to a confined fluid is transmitted equally in all directions.

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Archimedes' Principle

Any object submerged in a fluid experiences an upward buoyant force equal to the weight of fluid displaced.

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Bernoulli's Principle

High fluid velocity corresponds to low pressure, and low fluid velocity corresponds to high pressure.

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Zeroth Law of Thermodynamics

If two systems are in thermal equilibrium with a third, they are in thermal equilibrium with each other.

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Undamped Oscillation

Oscillatory motion where amplitude remains constant.

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Damped Oscillation

Oscillatory motion where amplitude decreases over time.

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Underdamped

Oscillation returning to equilibrium, amplitude decreasing.

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Critically Damped

Oscillation returns to equilibrium quickly without oscillations.

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Overdamped

Oscillation returns to equilibrium slowly without oscillations.

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Longitudinal Wave

Wave where particles move parallel to wave direction.

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Transverse Wave

Wave where particles move perpendicular to wave direction.

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Principle of Superposition

Wave displacements add up at a point.

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Periodic Wave

Repeating wave pattern with wavelength and frequency.

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Wavelength

Distance sound travels in one period.

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Thermal Expansion

The change in size (length or volume) of a material due to a change in temperature.

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Coefficient of Thermal Expansion

A material property indicating how much a material expands per unit length or volume for each degree Celsius increase in temperature.

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Coefficient of Volume Expansion

The increase in volume per unit of the original volume for each degree Celsius rise in temperature.

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Boyle's Law

At a constant temperature, the volume of a fixed amount of gas is inversely proportional to its pressure.

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Charles' Law

At constant pressure, the volume of a fixed amount of gas is directly proportional to its absolute temperature.

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Gay-Lussac's Law

At constant volume, the pressure of a fixed amount of gas is directly proportional to its absolute temperature.

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Ideal Gas Law

The relationship between pressure (P), volume (V), temperature (T), and the amount of gas (n) in an ideal gas: PV = nRT .

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Isothermal Process

A thermodynamic process that occurs at a constant temperature.

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Isobaric Process

A thermodynamic process that occurs at constant pressure.

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Isochoric Process

A thermodynamic process that occurs at constant volume.

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Torque

A measure of the turning effect of a force on a rigid body, calculated as the product of the force and the lever arm.

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Lever Arm

The perpendicular distance from the axis of rotation to the line of action of the force.

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Moment of Inertia

A measure of an object's resistance to changes in its rotational motion. It depends on the object's mass distribution and shape.

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Static Equilibrium

A state where the sum of all forces acting on a body is zero, resulting in no net force or acceleration.

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Rotational Motion

Motion of a body around an internal axis.

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Circular Motion

Motion of a body around an external axis, like an orbit.

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Kepler's 1st Law

States that planets move in elliptical orbits with the Sun at one focus of the ellipse.

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Kepler's 2nd Law

States that a line connecting a planet to the Sun sweeps out equal areas in equal intervals of time.

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Kepler's 3rd Law

States that the square of a planet's orbital period is proportional to the cube of its average distance from the Sun.

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Damping

The decrease in amplitude of an oscillation due to energy loss.

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Study Notes

Torque and Moment of Inertia

  • Equilibrium occurs when the sum of concurrent forces acting on a body is zero.
  • A body at rest or constant motion is in equilibrium.
  • Statics studies forces on stationary bodies.
  • The center of gravity is the point where the weight of an object is concentrated.
  • Torque is the turning effect of a rigid body.
  • Torque is calculated as the product of perpendicular force and lever arm length (T = F * l).
  • Clockwise torque is negative, counterclockwise is positive.
  • The lever arm is the distance from the pivot to the force application point.
  • Moment of inertia (I) resists changes in rotational motion.
  • Moment of inertia is calculated as I = mr2 (where m is mass and r is radius from axis of rotation).

Static Equilibrium

  • Static equilibrium occurs when the sum of all concurrent forces acting on a body is zero (ΣF = 0).
  • The sum of all torques acting on a body is also zero (Στ = 0).
  • Rotational motion is the motion of a body about an internal axis.
  • Examples include spinning tops, bicycle wheels, and Earth's movement.
  • Circular motion occurs when the axis of motion is outside the object, like orbiting satellites.

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