ALL EQUATIONS!

Question 1

av speed?

Answer 1

av speed = distance / time

Question 2

what is the equation for acceleration?

Answer 2

acceleration = change in velocity/ time taken

a= v-u/t

Question 3

force?

Answer 3

f = ma
force = mass x acceleration

Question 4

weight?

Answer 4

weight=mass x graviational field strength

Question 5

moment?

Answer 5

moment = force x perpendicular distance from pivot

Question 6

power?

Answer 6

power = current x voltage
P = IV

Question 7

energy transferred?

Answer 7

energy transferred = current x voltage c time
E = I V t

Question 8

voltage?

Answer 8

voltage = current x resistance
V=IR

Question 9

charge?

Answer 9

charge = current x time
Q=It

Question 10

energy transferred?

Answer 10

energy transferred = charge x voltage
E = QV

Question 11

wave speed?

Answer 11

wave speed = frequency x wavelength
v = f x lamda

Question 12

frequency?

Answer 12

f= 1/T

Question 13

refractive index, angle of incidence, angle of refraction?

Answer 13

n= sin i / sin r

Question 14

critical angle and refractive index?

Answer 14

sin c = 1/n

Question 15

effeciency in energy?

Answer 15

useful energy output/total energy output x100%

Question 16

work done?

Answer 16

work done=force x distance moved

Question 17

ACW and CW?

Answer 17

ACW=CW

Question 18

gravitational potential energy?

Answer 18

gravitational potential energy = mass x height x gravitational field strength
GPE = mgh

Question 19

kinetic energy?

Answer 19

1/2 x mass x speed ^2
KE = 1/2. x m x v^2

Question 20

power?

Answer 20

power = work done/time taken
P= W/tq

Question 21

density?

Answer 21

denisty = mass / volume
p = F/A

Question 22

pressure difference?

Answer 22

pressure difference = height x density x gravitaitonal field strength
p = h x p x g

Question 23

pressure?

Answer 23

pressure = force / area
p = F/A

Question 24

change in thermal energy?

Answer 24

change in thermal energy = mass x specific heat capacity x change in temperature
change in Q = change in T x c x m

Question 25

pressure and kelvin temperature?

Answer 25

p1/t1=p2/t2

Question 26

pressure and volume for a given amount of gas?

Answer 26

p1v1=p2v2

Question 27

input and output voltage with turns?

Answer 27

input voltage/output voltage = primary turns/secondary turns

Question 28

input and output power?

Answer 28

VpIp=VsIs for 100% efficiency

Question 29

orbital speed?

Answer 29

orbital speed = 2 x pi x orbital radius / time period v = 2 x pi x r / t

Question 30

change in wavelength and galaxty stuff?

Answer 30

change in wavelength/ wavelength of reference galaxy = velocity of galaxy / speed of light