Equations that I have to know

Question 1

What is the formula for pressure (Pa)

Answer 1

Force (Newtons) / Area (cm2/m2)

Question 2

What is the formula for density ? (g/cm3)

Answer 2

Mass (g or kg) / Volume (cm3 or m3)

Question 3

What is the formula for pressure difference? (Pa)

Answer 3

pressure difference (Pa)= gravitational field strength (N/kg) x density (kg/m3) x depth (m)

Question 4

What is the formula for the change in thermal energy ? (Joules)

Answer 4

Change in thermal energy (Joules) = mass (g) x specific heat energy ( joules/ kg*celcius) x change in temperature ( celcius)

Question 5

What is the equation for efficiency?

Answer 5

Useful energy/ total energy *100

Question 6

What is the equation for frequency?

Answer 6

1/ time period (s)

Question 7

What is the equation for wave speed (m/s) ?

Answer 7

frequency (Hz) * wavelength (m)

Question 8

What is the equation for force?

Answer 8

mass (g) * acceleration ( m/s)

Question 9

How do you find out the weight?

Answer 9

mass * gravity strength ( m/s^2)

Question 10

Mega is:

Answer 10

• 1,000,000

Question 11

kilo is:

Answer 11

*1,000

Question 12

mili is:

Answer 12

/ 1000

Question 13

micro is:

Answer 13

/ 1,000,000

Question 14

How do you find the energy (joules) required to do something (e.g boil a kettle?)

Answer 14

energy (J) = mass (kg) * specific heat capacity * change in temperature (degrees C)

Question 15

How do you find the specific heat capacity?

Answer 15

specific heat capacity =energy (joules) / mass (kg) * change in temperature (degrees C)