Equations

Question 1

Wave speed, frequency and wave length

Answer 1

Wave speed = frequency x wave length

Question 2

Frequency, 1 and time period

Answer 2

Frequency = 1/time period

Question 3

Refractive index (n), angle of incidence and angle of refraction

Answer 3

N = sinI/ sinR

Question 4

Refractive index (n), 1 and critical angle

Answer 4

N = 1/ sinC

Question 5

Efficiency, useful output energy, input energy

Answer 5

Efficiency = useful output energy/ input energy x100

Question 6

God, m, g , h

Answer 6

Gpe = m x g x h

Question 7

Ke, m, v

Answer 7

Ke = 1/2 x m x v^2

V= square root {2Ke/m}

Question 8

Work done, force and distance

Answer 8

Work done = force x distance from

Question 9

Power, work done and time

Answer 9

Power = work done or energy/ time

Question 10

Charge, current and time

Answer 10

Charge = current/ time

Question 11

Voltage, current and resistance

Answer 11

Voltage = resistance x current

Question 12

Power, current and voltage

Answer 12

Power = current x voltage

Question 13

Acceleration, initial speed, final speed and time

Answer 13

Acceleration = (final speed - initial speed) / time taken for change in speed

Question 14

Force, mass and acceleration

Answer 14

Resultant force = mass x acceleration

Question 15

Weight, mass and gravitational thingy

Answer 15

Weight = m x g

Question 16

Moment, force and perpendicular distance

Answer 16

Moment = force x perpendicular distance

Question 17

Hookes law

Answer 17

Force 🐟 extension

Question 18

Force, final momentum, initial momentum and time taken for momentum change

Answer 18

Force = (final momentum - initial momentum) / time

Question 19

Density, mass and volume

Answer 19

Density = mass/ volume

Question 20

Pressure, force and area

Answer 20

Pressure = force/ area

Question 21

Pressure, height, density and gravitational thingy

Answer 21

Pressure = height x density x g

Question 22

Momentum, mass and velocity

Answer 22

Momentum = mass x velocity

Question 23

Voltage, energy transfer and charge

Answer 23

Voltage = energy transfer/ charge

Question 24

Force, change in momentum and time

Answer 24

Force = (mv-mu)/t

Question 25

Pressure law

Answer 25

P1/T1 = P2/T2

Question 26

Voltage and number of turns in a transformer

Answer 26

Vp/Vs = Np/Ns

Question 27

Current and voltage in a transformer

Answer 27

IpVp = IsVs