Intermediate Physics Challenge 2023
29 Questions
0 Views

Intermediate Physics Challenge 2023

Created by
@ThrilledNewOrleans

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What equation correctly represents the relationship between wave speed, frequency, and wavelength?

  • Wave speed = wavelength - frequency
  • Wave speed = frequency × wavelength (correct)
  • Wave speed = frequency ÷ wavelength
  • Wave speed = frequency + wavelength
  • Which of the following is the correct equation for calculating gravitational potential energy?

  • Gravitational potential energy = mass + gravitational field strength × height
  • Gravitational potential energy = mass × (gravitational field strength + height)
  • Gravitational potential energy = mass × gravitational field strength × height (correct)
  • Gravitational potential energy = mass ÷ height × gravitational field strength
  • What is the value of gravitational field strength on Earth, represented by g?

  • 9.8 kg/N
  • 9.8 N/kg (correct)
  • 9.8 J/kg
  • 10 N/kg
  • For an ideal gas at a constant temperature, what is the equation that describes the relationship between pressure and volume?

    <p>Pressure × Volume = constant</p> Signup and view all the answers

    According to the density equation, how do you calculate density?

    <p>Density = mass ÷ volume</p> Signup and view all the answers

    What does the equation for kinetic energy represent?

    <p>Kinetic energy = ½ mass × velocity</p> Signup and view all the answers

    What is the total potential energy stored by the gravity battery when the mass is raised for a distance of 300 m?

    <p>3.6 kWh</p> Signup and view all the answers

    At a discharge rate of 800 kW, what is the approximate speed at which the mass must descend to maintain this output given the efficiency of the generators?

    <p>4.47 m/s</p> Signup and view all the answers

    How long can the gravity battery maintain an output of 800 kW with an efficiency of 94%?

    <p>3.6 hours</p> Signup and view all the answers

    If the mass were to descend a distance of 150 m instead, how much energy would it provide at the same rate?

    <p>0.53 kWh</p> Signup and view all the answers

    Considering eight cables support the mass, what factor does this have on the overall potential energy if each cable independently supports the weight?

    <p>It has no effect on the potential energy</p> Signup and view all the answers

    Which of the following assumptions about the energy transfer process can be considered accurate for this gravity battery system?

    <p>Friction from the cables can be neglected</p> Signup and view all the answers

    How much work is done by a cyclist to increase their speed from 2.0 m/s to 6.0 m/s given a total mass of 95 kg, ignoring air resistance and friction?

    <p>760 J</p> Signup and view all the answers

    What is the correct relationship between displacement from the start line and time for a runner starting at a speed of 1 m/s and accelerating at 2 m/s² for 2 seconds?

    <p>Parabolic increase in displacement</p> Signup and view all the answers

    Which graph correctly represents the resistance of a thermistor against current through it, considering that the resistance decreases with an increase in temperature?

    <p>Linear decrease</p> Signup and view all the answers

    What happens to the wavelength and frequency of water waves when they travel from deeper to shallower water?

    <p>Wavelength decreases and frequency remains the same</p> Signup and view all the answers

    How much electrical energy does an electric kettle rated at 2.5 kW consume to boil 1.25 L of water in just under 3 minutes?

    <p>225 kJ</p> Signup and view all the answers

    If a cyclist accelerates from rest to a speed of 6.0 m/s, which concept primarily represents the energy change involved assuming no losses?

    <p>Kinetic energy</p> Signup and view all the answers

    What effect does moving from deeper water to shallower water have on the speed of water waves?

    <p>Speed decreases</p> Signup and view all the answers

    During the acceleration phase, what is the final speed of the marathon runner after 2 seconds?

    <p>5 m/s</p> Signup and view all the answers

    If the bulbs in a circuit are not lit to full brightness, what could be a potential reason?

    <p>The circuit is completely open.</p> Signup and view all the answers

    What is the approximate reading on the voltmeter in a circuit where the bulbs are dim?

    <p>60 V</p> Signup and view all the answers

    Which statement correctly describes the energy transfer in a gravity battery system?

    <p>Energy is stored as gravitational potential energy.</p> Signup and view all the answers

    When a gravity battery releases energy, which of the following occurs?

    <p>Electrical generators are activated as masses descend.</p> Signup and view all the answers

    If a gravity battery system has an output of 1 kW for 1 hour, how much energy does it transfer in kilowatt-hours?

    <p>1 kWh</p> Signup and view all the answers

    What is an essential feature of the cylindrical container used in the gravity battery?

    <p>It should be filled with a mass of significant average density.</p> Signup and view all the answers

    How does raising the masses in a gravity battery affect the energy system?

    <p>It increases stored gravitational potential energy.</p> Signup and view all the answers

    In terms of volume, what is the volume of the cylindrical container if its diameter is 5.0 m and height is 4.0 m?

    <p>78.5 m³</p> Signup and view all the answers

    If a gravity battery system fails to meet peak energy demands, what might be a consequence?

    <p>Prolonged power outages.</p> Signup and view all the answers

    Study Notes

    Intermediate Physics Challenge 2023

    • The Intermediate Physics Challenge is a competition for students in year 12.
    • The competition consists of three sections: multiple choice, short written questions, and extended numerical questions.
    • The competition covers a range of physics topics, including mechanics, heat, electricity, magnetism, and waves.

    Gravity Batteries

    • Gravity batteries store energy by raising large masses, typically crushed rock, up a shaft.
    • When energy is needed, the masses are lowered, generating electricity.
    • The energy stored in a gravity battery is equal to the gravitational potential energy of the mass.

    Energy Storage System

    • The container used in the gravity battery system has a diameter of 5.0 m and a depth of 4.0 m.
    • The container is filled with crushed rock with an average density of 5200 kg/m³.
    • The mass can be raised or lowered a total distance of 300 m in the shaft.
    • The efficiency of the electrical generators is 94%.
    • The gravity battery can provide energy to the national grid at a rate of 800 kW.
    • Eight cables are used to support the mass.

    Parallax

    • Edmund Halley proposed using the transit of Venus across the Sun to determine the absolute scale of the solar system.
    • The difference in the apparent positions of an object seen from two different points is called parallax.
    • In 1769, Captain James Cook travelled to Tahiti to observe the transit of Venus.
    • The parallax angle was determined to be 0.0130° from two locations separated by a distance of 9560 km.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Description

    Test your knowledge with the Intermediate Physics Challenge aimed at Year 12 students. This competition includes multiple-choice, short questions, and numerical problems covering mechanics, heat, electricity, magnetism, and waves. Challenge yourself and see how well you understand these fundamental physics concepts!

    Use Quizgecko on...
    Browser
    Browser