equations

• frequency = 1/time period
• refractive index (n) = sin(i)/sin(r)
• sin(critical angle) = 1/n
• efficiency = (useful energy output/total energy output) x 100
• speed = distance/time
• acceleration = change in velocity / time
• (final speed)2 = (initial speed)2 + (2 x acceleration x distance)
• force = mass x aceleration
• weight = mass x gravitational field strength
• power = current x voltage
• energy = current x voltage x time
• voltage = current x resistance
• charge = current x time
• energy = charge x voltage
• wave speed = frequency x wavelength
• work done = force x distance moved
• gravitational potential energy = mass x gravitational field strength x height
• kinetic energy = 1/2 x mass x (speed)2
• power = work done / time
• density = mass / volume
• pressure = force / area
• pressure difference = height x density x gravitational field strength
• pressure / temperature = constant?

  P1/T1 = P2/T2
• orbital speed = 2 x pi x orbital radius / time