Formulae

Question 1

Density =

Answer 1

Mass /volume

Question 2

speed =

Answer 2

Distance/ time

Question 3

Average speed

Answer 3

total distance/ total time

Question 4

acceleration

Answer 4

Change in velocity/ time

Question 5

spring constant

Answer 5

force/ extension

Question 6

force

Answer 6

mass x acceleration

Question 7

moment of a force

Answer 7

force x perpendicular distance

Question 8

impulse

Answer 8

force x time

Question 9

resultant force

Answer 9

change in momentum / change time

Question 10

kinetic energy

Answer 10

half mass x velocity squared

Question 11

Gravitational potential energy

Answer 11

Mass x gravity x height

Question 12

work

Answer 12

force x distance travelled in direction of force

Question 13

percentage efficiency

Answer 13

(Useful output / total input) x 100

Question 14

power

Answer 14

work/time

Question 15

pressure (liquid)

Answer 15

height x density x gravity

Question 16

pressure

Answer 16

force/ area

Question 17

temp (kelvin)

Answer 17

temp in celcius + 273

Question 18

specific heat capacity

Answer 18

change in energy / mass x temp

Question 19

speed of light

Answer 19

3.0 × 10 to the 8 m/s

Question 20

human audio freq

Answer 20

20 to 20 000Hz

Question 21

speed of sound in air

Answer 21

330-350m/s

Question 22

Charge

Answer 22

current x time

Question 23

e.m.f

Answer 23

Work/ charge

Question 24

Voltage

Answer 24

Current x resistance

Question 25

Power

Answer 25

Current x Voltage

Question 26

Energy transferred

Answer 26

current x voltage x time

Question 27

potential divider resistors

Answer 27

R1 / R2 =V1 /V2

Question 28

Power loss

Answer 28

Current squared x resistance

Question 29

transformer

Answer 29

primary coil voltage /second coil voltage = turns on primary coil / turns on second coil

Question 30

hubble

Answer 30

2.2 x 10 to the -18 per second

Question 31

age of universe

Answer 31

1/ speed /( 60sx60 minx 24h x 364.25)