34 Questions
What does Fig. 17.3 show?
Variation of gravitational field strength with distance from the centre of the Earth
What is the unit of the gravitational field strength g in Fig. 17.3?
N kg^-1
What is the ratio of the mass of Earth to the mass of Mars?
dependent on the value of r when g = 0
What is the purpose of a wind turbine?
To convert kinetic energy into electrical energy
What is the unit of the kinetic energy of the air incident at the turbine per second?
MJ s^-1
What is the equation for the maximum input power P from the wind?
P = 1/3 tAv^2
What is the characteristic of the equation P = 1/3 tAv^2?
It is a homogeneous equation
What is the physical quantity represented by the variable 't' in the equation P = 1/3 tAv^2?
Density of air
What is the Cosmological principle based on?
The universe is isotropic, homogeneous and has universal laws of physics
What is the purpose of using absorption spectral lines in astronomy?
To determine the relative velocity of distant galaxies
What is the wavelength of the absorption spectral line observed in the laboratory?
280 nm
What is the significance of the Hubble constant in astronomy?
It is used to determine the velocity of galaxies
What is a characteristic of a black hole?
It has a massive centre
What is the origin of the Universe according to the Big Bang theory?
The Universe evolved from the Big Bang
Which organization manages OCR?
Cambridge Assessment Group
Where should one contact for copyright queries related to OCR assessment materials?
First Floor, 9 Hills Road, Cambridge
If OCR fails to correctly acknowledge or clear any third-party content, what stance do they take?
They will correct the mistake at the earliest opportunity
What does OCR provide after each live examination series related to copyright information?
A copyright acknowledgements booklet
What is the brand name of the organization that OCR is part of?
Cambridge Assessment
How can one access the OCR Copyright Acknowledgements Booklet?
Download from the public website
What is the input power to the wind turbine when the wind speed is 8.0 m s$^{-1}$?
1.2 MW
What is the density of air used in the wind turbine calculation?
1.3 kg m$^{-3}$
What efficiency is used for each wind turbine in the wind farm calculation?
42%
What is the required output power for the wind farm to produce?
50 MW
On an incomplete Hertzsprung-Russell (HR) diagram, what is found at region A?
Red giants
What is the surface temperature of the Sun?
5800 K
What is the wavelength of the emitted light at maximum intensity for Beta Pictoris?
370 nm
What needs to be sketched on Fig. 20.3?
Velocity v/s time graph
What is meant by an elastic collision?
A collision where both kinetic energy and momentum are conserved
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?
$6.64 × 10^{-24}$ kg m/s
Why are only small amounts of helium found in the Earth’s atmosphere?
Helium atoms have a small mass and high velocity leading them to escape the 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?
It goes to the right
How does the mass of a helium atom compare to typical atomic masses?
It is significantly smaller
Using the kinetic theory of gases, what factor primarily explains why helium escapes Earth's atmosphere?
High kinetic energy of helium atoms
This quiz question asks about the graph showing the variation of the resultant gravitational field strength between two planets with distance from the centre of the Earth.
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