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Bmat Equations > Equations > Flashcards

Equations Flashcards

1
Q

Equation for current

A

I=Q/t

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2
Q

Equations for voltage?

A

V=w/Q

V=IR

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3
Q

Resistance of a parallel circuit?

A

1/resistancet =1/R1 +1/R2….

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4
Q

Equation for energy transferred?

A

E=QV

P=IV

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5
Q

Equation for power and then power loss?

A

P=IV

P=I^2R

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6
Q

Transformer equation for 100% efficient

A

VpIp=VsIs

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7
Q

Transformer equation

A

Vs/Vp=Ns/Np

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8
Q

Equation for annihilation reaction?

A

E=mc^2

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9
Q

Equation for heart rate?

A

1/time period (for one beat) x 60

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10
Q

What is peak frequency?

A

Hot objects always emit more of onevfrequency than any other this wavelength is called the peak frequency

The higher the temperature the more radiation it emits so higher peak frequency

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11
Q

What does a hot star look like?

A

Blue due to high frequency

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12
Q

How do you work out what stars are made of?

A

Use spectra as each element has its own line spectrum, compare it to stars spectra and compare positions

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13
Q

Evidence for red shift?

A

Spectra of distant galaxy is shifted to left compared to earths so shows moving away

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14
Q

Distance time graphs

Gradient
Negative gradient
Curves

A

Velocity
Going back
Acceleration/deceleration

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15
Q

What is acceleration?

A

Change in velocity -speed or direction

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16
Q

Equation for Acceleration

A

Change in velocity / change in time

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17
Q

Velocity time graph

Gradient
Area
Curve

A

Acceleration
Distance travelled
Changing acceleration

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18
Q

Equation for weight

A

W=mg

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19
Q

What does a resultant force mean

A

Object will change urs state of rest or motion

Change in velocity - object will accelerate in its direction

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20
Q

Force equation

A

F=ma

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21
Q

Equation for momentum

A

Momentum=mv

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22
Q

Momentum before=

A

Momentum after collision

23
Q

Equation for force

A

F=change in momentum/ time

24
Q

Work done equation

A

E=Fd

25
Q

What is power and it’s equation?

A

Rate of doing work

Power=w/t=energy transferred/ time

26
Q

What is power measured in?

A

J/s

27
Q

Equation for kinetic energy?

A

Kinetic energy=0.5x mass x velocity^2

28
Q

Kinetic energy liked to work done by brakes?

A

0.5mv^2=Fd

29
Q

Equation for gravitonal potential energy

A

Gravpot=mgh

30
Q

What do falling objects do?

A

Concert GPE to KE

31
Q

4 car adaptations

A

Crumple zones

Air bags

Seat belts

Side impact bar

32
Q

2 examples of transverse waves?

A

Light/ EM waves

S- waves seismic

33
Q

Examples of longitudinal waves?

A

Sound waves

P-waves (seismic)

34
Q

Equation for speed of a wave?

A

S=f x wavelength

35
Q

What feature of a wave doesn’t change once it’s left the source?

A

Frequency

36
Q

What is the law of reflection

A

Angle of incidence=angle of reflection

37
Q

What is the range of human hearing?

A

20kHz

38
Q

Speed of em wave in a vacuum?

A

3x10^8

39
Q

Order of Em from largest wave length

A 
Radio
Micro 
Infrared
Visible
Ultra violet
X-ray
Gamma
40
Q

Radio waves

A

Communication

Long wave=diffract around earths surface
Diffract around hills etc

Short wave- radio and tv
Travel long as reflected off ionosphere

41
Q

Microwaves

A

Satellites and mobile phones
-pass through atmosphere

Microwave ovens

42
Q

Infrared

A

Monitoring temperatures
Cooking
Wireless controls
Optical fibres

43
Q

Visible light

A

Photography

Optical fibres

44
Q

Ultra violet

A

Detect forged bank notes

Skin cancer , cataracts, pre skin aging

45
Q

Which waves can cause ionisation?

A

Ultra violet, X-ray, gamma ray

46
Q

X-rays

A

Radiography imaging

47
Q

Gamma rays

A

Cancer treatment

48
Q

Which way does energy flow?

A

From hot to cold

49
Q

What is temperature?

A

Measure of the average kinetic energy of particles

50
Q

Why doesn’t temp go down until all liquid/solid?

A

When condensing or freezing bonds are formed between particles which releases energy

51
Q

What is conduction Of heat?

A

Where vibrating particles pass on extra kinetic energy to neighbouring particles

52
Q

Equation for density?

A

D=m/v

53
Q

What is the third gas law?

A

Pressure is directly proportional to temperature when the volume is constant

Bmat Equations (4 decks)

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