Recent content by ultralightbeam

The relevenat equation I know is density = mass /volume I think writing that out gave me a brainwave..would you multiply the volume by the density, giving an answer of 162.2kg?

Not familiar with that equation:/

Would you divide it by the time so 1second? Since the question asks the mass in 1 second?

So would that just be the cross-sectional area multiplied by 3.5 since the velocity is 3.5 metres per second? Giving a value of 0.1575m^3

Yes it is, sorry I am pretty clumsy on the keyboard. 4.5x10^-2

Added it as a reply.

Sorry, first post on here. The motor on a small boat has a propeller attached that sends back a column of warer of cross-sectional area 4.5x10^-2 m^2 at a speed of 3.5ms. Density of seawater: 1030 kgm3 water is originally at rest

Homework Statement Cross sectional area: 4.5x10^-2 m Speed: 3.5ms-1 Density of sea water: 1030 kg m-3 Calculate the mass of water propelled backwards in 1 s. Homework EquationsThe Attempt at a Solution Could someone just guide me through it, maybe give me a starting point like which equation...