ESAT knowledge

for non independent events what is the probability of A and B

1-(P(A)’ x P(B)’)

The hotter the body the ____ infrared it emits

more

What is a perfect black body

• absorbs all of the radiation incident on it

• Does not reflect or transmit radiation

• it is the best possible emitter

The higher the temp the _____ the wavelength

smaller

what is radiation balance

the amount of radiation emitted = the amount of radiation absorbed

factors affecting the temperature of a system

• mass of substance

• type of material

• energy input to the system

how does mass affect the temperature of a substance

the more particles the harder it is to heat the substance

what is pressure

the force exerted normally on a body per unit area

how does the depth affect density

increases

how does the depth affect the pressure

increases

when when the weight of an object is = upthrust what happens

the object will float

when the wavespeed increases

the absorption of radiation increases

P Waves

• longitudinal

• travel through solids and liquids

• primary waves

S Waves

• transverse waves

• travel through solids

• secondary wave

tan 0

0

tan 30

root 3 over 3

tan 45

1

tan 60

root 3

tan 90

undefined

derivative a^x

ln a.a^x

area of an equilateral triangle

root 3/ 2 x side length²

whats the relationship between voltage and the number of turns

Np/Ns = Vp/Vs

nth term of an arithmetic

a+(n-1)d

sum to n terms arithmetic

n/2(2a+(n-1)d)

nth term geometric

ar^(n-1)

sum to n terms

a(1-r^n)/1-r

sum to infinity

a/1-r

what is the condition for sum to infinity

modulus of r less than 1

triangle rule of inequality

for any triangle to exist, the sum of two of the lengths must be greater than the length of the third side

the distance between two roots of a quadratic

(b²-4ac)^1/2 /a

area of a sector

0.5r²a

arc length

ra