High school physics problem, a speedboat, the resistance to the size of its speed is proportional to the square (f=kv2), and the tank has 20L oil, when
The burning of oil on the work of 20L boat: t=40km/10=4000 (s) W=fv*t=kv^3*t two speed traction force is equal to the resistance is 4 times the original is K (2V) and ^2*2v*T=kv^3*t T=500s S=T*2v=500*20=10 (km) is not the answer you see such words do not know where you can ask Kazakhstan
The question is, then I understand that the boats do uniform motion. The drag and drag are equal
Hello,This is the problem of work and energy. The tank has 20L oil, which shows that the energy supplied in the two cases is equal; the work done to overcome the resistance is equal during the running.
