Physics Units and Formulas Quiz
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Questions and Answers

What is the magnitude of the resultant vector for A = 6^i + 4^j and B = 2^i - 7^j?

  • 85
  • 58 (correct)
  • 50
  • 10

What is the y-component of the resultant vector R for A = 3^i - 6^j and B = 8^i + 2^j?

  • -4 (correct)
  • 2
  • -3
  • -8

What is the magnitude of the resultant displacement if a hiker walks 30 km due east and then 50 km at a 45° angle north of east?

  • 70.50 km
  • 66.17 km (correct)
  • 60.32 km
  • 72.45 km

Find the angle between the vectors A = 2^i + 5^j and B = 4^i + 2^j.

<p>52° (D)</p> Signup and view all the answers

Determine the angle between the vectors A = 5^i - 2^j and B = -3^i + 6^j.

<p>136° (D)</p> Signup and view all the answers

What is the unit of pressure P when a force F is applied to a surface area A?

<p>kg m−1 s−2 (D)</p> Signup and view all the answers

What is the unit of gravitational potential energy U for an object of mass m at height h?

<p>kg m2 s−2 (C)</p> Signup and view all the answers

What is the unit of density ρ of a fluid in the drag force equation Fd = 1/2 Cd ρAv?

<p>kg m−3 (C)</p> Signup and view all the answers

What is the unit of kinetic energy K when expressed in terms of mass m and velocity v?

<p>kg m2 s−2 (B)</p> Signup and view all the answers

What is the unit of frequency f related to the wave speed v and wavelength λ?

<p>Hz (or s−1) (B)</p> Signup and view all the answers

Flashcards

Unit of Pressure

The unit of pressure is kg⋅m⁻¹⋅s⁻²

Unit of Gravitational Potential Energy

The unit of gravitational potential energy is kg⋅m²⋅s⁻²

Unit of Fluid Density

The unit of fluid density is kg⋅m⁻³

Unit of Kinetic Energy

The unit of kinetic energy is kg⋅m²⋅s⁻²

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Unit of Frequency

The unit of frequency is s⁻¹ (or Hertz)

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Resultant vector magnitude (Q11)

The length of the resultant vector (the sum of two or more displacement vectors), representing the overall displacement.

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Y-component resultant vector (Q10)

The vertical component of the vector obtained by adding two vectors together.

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Angle between two vectors (Q16)

The angle formed by connecting the initial points of two vectors to a common point. Used in vector calculations.

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Vector Resultant (General)

The combined effect of multiple vectors, calculated by vector addition (or subtraction).

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Components of a vector (implied in questions)

The individual parts of a vector, typically along the x and y axes, used to represent the vector in a Cartesian plane.

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Study Notes

Units of Physical Quantities

  • Pressure (P): kg m⁻¹s⁻²
  • Gravitational Potential Energy (U): kg m²s⁻²
  • Density (p): kg m⁻³
  • Kinetic Energy (K): kg m²s⁻²
  • Frequency (f): Hz (or s⁻¹)

Physics Formulas and Quantities

  • Pressure: Pressure = Force / Area (P = F/A)
  • Gravitational Potential Energy: U = mgh (m = mass, g = acceleration due to gravity, h = height)
  • Drag Force: Fd = ½ * Cf * p * A * v² (Cf = drag coefficient, p = density, A = area, v = velocity)
  • Kinetic Energy: K = ½ * mv² (m = mass, v = velocity)
  • Frequency of a wave: f = v / λ (v = wave speed, λ = wavelength)

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Description

Test your knowledge of key physical quantities and their units, such as pressure, energy, and density. This quiz covers essential formulas used in physics including gravitational potential energy and kinetic energy. Challenge yourself and solidify your understanding of these fundamental concepts.

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