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Questions and Answers
What does Fig. 17.3 show?
What does Fig. 17.3 show?
- Variation of gravitational field strength with distance from the centre of the Earth (correct)
- Variation of kinetic energy with distance from the centre of the Earth
- Variation of electrical energy with distance from the centre of the Earth
- Variation of mass with distance from the centre of the Earth
What is the unit of the gravitational field strength g in Fig. 17.3?
What is the unit of the gravitational field strength g in Fig. 17.3?
- N kg^-1 (correct)
- m s^-2
- J kg^-1
- mJ kg^-1
What is the ratio of the mass of Earth to the mass of Mars?
What is the ratio of the mass of Earth to the mass of Mars?
- 1:3
- dependent on the value of r when g = 0 (correct)
- 2:1
- 3:1
What is the purpose of a wind turbine?
What is the purpose of a wind turbine?
What is the unit of the kinetic energy of the air incident at the turbine per second?
What is the unit of the kinetic energy of the air incident at the turbine per second?
What is the equation for the maximum input power P from the wind?
What is the equation for the maximum input power P from the wind?
What is the characteristic of the equation P = 1/3 tAv^2?
What is the characteristic of the equation P = 1/3 tAv^2?
What is the physical quantity represented by the variable 't' in the equation P = 1/3 tAv^2?
What is the physical quantity represented by the variable 't' in the equation P = 1/3 tAv^2?
What is the Cosmological principle based on?
What is the Cosmological principle based on?
What is the purpose of using absorption spectral lines in astronomy?
What is the purpose of using absorption spectral lines in astronomy?
What is the wavelength of the absorption spectral line observed in the laboratory?
What is the wavelength of the absorption spectral line observed in the laboratory?
What is the significance of the Hubble constant in astronomy?
What is the significance of the Hubble constant in astronomy?
What is a characteristic of a black hole?
What is a characteristic of a black hole?
What is the origin of the Universe according to the Big Bang theory?
What is the origin of the Universe according to the Big Bang theory?
Which organization manages OCR?
Which organization manages OCR?
Where should one contact for copyright queries related to OCR assessment materials?
Where should one contact for copyright queries related to OCR assessment materials?
If OCR fails to correctly acknowledge or clear any third-party content, what stance do they take?
If OCR fails to correctly acknowledge or clear any third-party content, what stance do they take?
What does OCR provide after each live examination series related to copyright information?
What does OCR provide after each live examination series related to copyright information?
What is the brand name of the organization that OCR is part of?
What is the brand name of the organization that OCR is part of?
How can one access the OCR Copyright Acknowledgements Booklet?
How can one access the OCR Copyright Acknowledgements Booklet?
What is the input power to the wind turbine when the wind speed is 8.0 m s$^{-1}$?
What is the input power to the wind turbine when the wind speed is 8.0 m s$^{-1}$?
What is the density of air used in the wind turbine calculation?
What is the density of air used in the wind turbine calculation?
What efficiency is used for each wind turbine in the wind farm calculation?
What efficiency is used for each wind turbine in the wind farm calculation?
What is the required output power for the wind farm to produce?
What is the required output power for the wind farm to produce?
On an incomplete Hertzsprung-Russell (HR) diagram, what is found at region A?
On an incomplete Hertzsprung-Russell (HR) diagram, what is found at region A?
What is the surface temperature of the Sun?
What is the surface temperature of the Sun?
What is the wavelength of the emitted light at maximum intensity for Beta Pictoris?
What is the wavelength of the emitted light at maximum intensity for Beta Pictoris?
What needs to be sketched on Fig. 20.3?
What needs to be sketched on Fig. 20.3?
What is meant by an elastic collision?
What is meant by an elastic collision?
Given that the mass of a helium atom is $6.64 × 10^{-27}$ kg, what is the magnitude of the momentum p of Y after the collision if its velocity is 610 m/s?
Given that the mass of a helium atom is $6.64 × 10^{-27}$ kg, what is the magnitude of the momentum p of Y after the collision if its velocity is 610 m/s?
Why are only small amounts of helium found in the Earth’s atmosphere?
Why are only small amounts of helium found in the Earth’s atmosphere?
If the angle of deflection of X is 25° after the collision, what does this imply about the direction of the velocity of X?
If the angle of deflection of X is 25° after the collision, what does this imply about the direction of the velocity of X?
How does the mass of a helium atom compare to typical atomic masses?
How does the mass of a helium atom compare to typical atomic masses?
Using the kinetic theory of gases, what factor primarily explains why helium escapes Earth's atmosphere?
Using the kinetic theory of gases, what factor primarily explains why helium escapes Earth's atmosphere?
