Recent content by Chemfriend

So we don't need the angle 36,87? Now it seems much harder as I thought. The only things we need are velocity of swimmer, distance to C (50 m) and velocity of river? SO we need to know what angle he needs to swim to achieve 50 m? Is this the hardest part or the rest is harder? Can you please...

Now this should be right. https://s11.postimg.org/4n4mgkifn/thisshouldberight.png The angle is 36,87 because of pythagoras sentence? (50^2=30^2+40^2) and then cos-1 0,8 = 36,87.

https://s16.postimg.org/6m88cigzp/now.png Is this right?

I think it should be like this: https://s11.postimg.org/jeumzswkz/result.png?2

https://s12.postimg.org/dh5jgmazx/vector.png I think this is it. (v1)*(v2)* sin 90°?

I think that if he swum with the flow, I would have to sum the velocities (1+1,25=2,25 m/s). If he swum against the flow, it would be 1,25-1=0,25 m/s. And if he swum directly across the river? Now I am not sure, because you are right.

Then he is moving with river's current. If he swum directly across the river his velocity would be: v=sqrt((1,25)^2-(1)ˇ2) = 0,75 m/s ? But he is swimming with angle and this is the problem.

Hi, I have a homework and I am not sure about some things. 1. Homework Statement Person A and person B are next to river. Velocity of river is 1 m/s. There is a person drowning 30 m from shore. He doesn´t move, because there is a something, which he can hold. People A and B are 40 far from...