Forgotten Flashcards
Sum to n of arithmetic
1/2n (2a + (n-1)d)
Sum to infinity geometric
A/1-r
Sum to n of geometric
A(1-r^n)/1-r
Teerm for arithmetic
Un = a + n-1 d
Term for geometric
= a r^n-1
Volume cone
Area!
1/3 h pi r 2
Area sphere
4 pi r2
Area of a cone
Pi r 2 + pi r l
Angle at centre is twice angle at circumference
Angles in thr same segment are EQUAL
Congruent vs similar?
Similar is when angles same or sides ratio same
Congruent when they are EQUAL ASA SSS ETC
How can insulators be charged
By friction, this is he transfer of electrons from the 8nshkator or too it
When is a voltage or current induced in magnetism
When a wire cuts magnetic field lines or when mangentic field changes
That is thermal radiation
Electromagnetic radiation in infrared region
PV = at constant Tempe?
Constant
Doppler effect?
Convection and conduction
Conduction is a process where transfers of heat takes place between objects by DIRECT CONTACT
CONVECTION is the heat transfer in fluids by real movement kf matter (water or gas)
Remember that fir critical angle what must refractive index be
What it’s going into must be bigger than itself
What gives loudness and pitch properties in sound
Loudness = amplitude
Pitch = dreaucney
Human range of hearing
20 to 20000 he
Alpha beta gamma penetration and ionising.
Deflection in magnetic fields
FUNDAMENTAL THEOREM OF CALCULUS?
integral of an inverse function is just the normal function values in limits
Or jus integral of a function, find inverse and plug in
Combining integral ranges?
Jus bun off common E number top and bottom
Elastic collision?
Kinetic energy is conserved
Node anti node
Anti is high hide is low
Distance e between two nodes is half orig sk wave,e the
Convection
Heat energy transferred from hot to cold by convection as the liquids and gases expand when they are heated , so they take more volume
As a result hit areas less dense
So they rise into cold areas
Denser gas which is colder will thus then fall into warm areas
And convection current set up warming everything
