Recent content by paulxu11

The pic is here

Homework Statement https://moodle.telt.unsw.edu.au/pluginfile.php/2296810/question/questiontext/2691158/6/1668509/cart%20track.png A block of ice (that we shall treat as a particle) slides with negligible friction or air resistance on the curved tpath sketched (black line). The mass of the...

That's a good new :smile:hh Yes i will check them coz it is an online quiz, and once i submit it i get marked... So I really want to make sure they are correct For the efficiency , I think I did useful/input: ''[total_energy(input) - energy_air_resistance(loss) ]/total_energy(inpit)...

Thanks for replying 1.2 litres = 1.2 * 10^-3 m^3 rpm=3000 -> time_for_2revlotions=2/3000 mins=1/1500 *60 sec=0.04 sec So volume_per_sec=dV=(1.2 * 10^-3 m^3) per (0.04 sec) =0.03 m^3/sec speed_of_gas=50m/s from the question If the diameter = Z m Then Pi * (Z/2)^2 * 50 =...

Homework Statement The problem: Here is an approximate reaction for burning hydrocarbons in air: (CH2)n + 1.5*n O2 + 6n N2 -> n CO2 + n H2O + 6n N2 (n is an integer) The (CH2)n approximates the fuel, and everything on the right is the exhaust. The atomic masses of hydrogen, carbon, nitrogen...