formulas

Question 1

hookes law force

Answer 1

F= constant x extension

Question 2

moment

Answer 2

m= force x distaance from pivot

Question 3

f1 x d1=

Answer 3

f2 x d2

Question 4

force

Answer 4

mass x acceleration

Question 5

weight

Answer 5

mass x acceleration

Question 6

momentum

Answer 6

mass x velocity

Question 7

impulse

Answer 7

force x contact tme= change in momentum

Question 8

speed ( velocity)

Answer 8

distance/ time

Question 9

acceleration

Answer 9

change in velocity/ change in time

Question 10

density

Answer 10

mass/volume

Question 11

gas law

Answer 11

p1xv1=p2 x v2

Question 12

work

Answer 12

w= force x distance

Question 13

potential energy

Answer 13

p. e = mass x gravity x height

Question 14

kinetc energy

Answer 14

0.5 x mass x velocity2

Question 15

power

Answer 15

p= work done ( difference energy) / time taken
p= current x voltage
p= I2 x R
p=V2/R

Question 16

pressure

Answer 16

p= force/ area

Question 17

pressure in liquids

Answer 17

p=density x gravity x depth

Question 18

current

Answer 18

c= charge/time

Question 19

p.d (voltage)

Answer 19

work done/ charge

Question 20

e.m.f

Answer 20

e.m.f= work done/time

Question 21

work is equal to

Answer 21

energy change

Question 22

ohms law

Answer 22

voltage= current x resistance

Question 23

energy

Answer 23

voltage x current x time

Question 24

resistance of a wire

Answer 24

R1 d21 = R2 d2

Question 25

resistors in series

Answer 25

R= R1+ R2

Question 26

resistors in parallel

Answer 26

R1 x R2/R1+R2

Question 27

potential divider

Answer 27

Vout= R1/R1+R2 X Vin
Ri/R2=V1/V2

Question 28

heat/ thermal energy

Answer 28

mass x specific heat capacity x temperature change

Question 29

efficiency

Answer 29

(useful energy ( or power output)/ energy or power input)x 100

Question 30

wavespeed

Answer 30

frequency x wavelength

Question 31

frequency

Answer 31

number of ocilations/ time
1/ time for 1 ocilation

Question 32

refractive index

Answer 32

sini/sinr
1/sinc
v1/v2

Question 33

speed of light in vacum

Answer 33

3 x 10^8

Question 34

speed of sound in air

Answer 34

330 m/s

Question 35

human audible range

Answer 35

20 to 20 000 Hz

Question 36

transformer

Answer 36

turns in primary coil/turns in secondary coil=voltage in primary coil/voltage in secondary coil

Question 37

power law in transfomer

Answer 37

power input= power output
vp x ip = vs x is

Question 38

orbital speed

Answer 38

v= 2 π r/ T

Question 39

hubbles constant

Answer 39

v/d

Question 40

age if the universe

Answer 40

d/v
1/Hubbles constant

Question 41

hubbles constant value

Answer 41

2.2 x 10 ^-18 per second

Question 42

light year value

Answer 42

9.5 x 10^15

Question 43

milky way galaxy diameter

Answer 43

100,000 light years

Question 44

mega

Answer 44

x1 000 000

Question 45

kilo

Answer 45

x 1000

Question 46

milli

Answer 46

divide 1000

Question 47

force/weight unit

Answer 47

newtons (N)

Question 48

temperature unit

Answer 48

C or K

Question 49

velocity, speed unit

Answer 49

m/s

Question 50

current unit

Answer 50

ammps (A)

Question 51

chanrge unit

Answer 51

coulombs (C)

Question 52

moments unit

Answer 52

Nm

Question 53

Power unit

Answer 53

watts

Question 54

pressure units

Answer 54

pascals (pa) OR N/cm^2

Question 55

electrical energy units

Answer 55

kWh

Question 56

Mass unit

Answer 56

g,kg

Question 57

frequency unit

Answer 57

hertz

Question 58

acceleration units

Answer 58

m/s^2

Question 59

p.d (voltage) units

Answer 59

volts (v)

Question 60

resistance unit

Answer 60

ohms (omega symbol)

Question 61

momentum unit

Answer 61

kg m/s

Question 62

density unit

Answer 62

g/cm^3 OR kg/m^3

Question 63

work and alll energy types

Answer 63

Joules (J)

Question 64

specific heat capacity

Answer 64

J/Kg0C, J/g0C