Recent content by rafael_josem

Homework Statement The figure shows a mast and parts of the equipments of a sailboat. The elements CD and EF belongs to the same plane, CD has 7.5m of length and has an angle of 45º with a vertical line that passes by C. When \theta = 15º the tension in the rope AB is 230N...

Hi, I have the following problem that I can't resolve... What's the system aceleration shown in the picture if, m1 = 0.25kg, m2 = 0.5 kg and m3 = 0.25kg? http://www.arnusa.org/system.jpg I don't know what to do or how to start...:confused: thanks...

Help, can't solve this problem... Hi, I have the follwing problem and I don't know how to start... A person make a trip in car with an average speed of 89.5km/h, except when the person stops 22 mins to rest. If the average speed of the person is 77.8km/h, How much time the person spends on...

Is it correct?? I did the following... ΣF = 0 ΣM = 0 ΣF = T_1 + T_2 -7.84N - 9.8N - 14.7N ΣM = -55.7Ncm - 137.2Ncm -294Ncm + 61cmT_1 T_1 = 8.0N T_2 = 7.84 + 9.8 + 14.7 - 8.0 T_2 = 24.34N Is this correct?? Thanks...

Hi, I need help with the following problem... The speed limit of a school zone is 40km/h. A Driver driving at this speed sees a child that crosses the street 13m in front of the car. He applies the brakes and desacelerates at 8m/s^2. If the reaction time of the driver is 0.50s, will the car...

Hi, I need help to calculate the force of T1 and T2... http://www.arnusa.org/Fuerza.jpg I know that EF = 0 (the sum of all forces), so I did something like this, EF = T1 +T2 -W1(9.8) - W2(9.8) - W3(9.8) = EF = T1 + T2 - 7.84N - 9.8N - 14.7N, then I don't know what's next... thanks...

Hi, I have the following problem of Calculus I class... I don't understand it and I don't know how to resolve it, can anybody help me?? A farmer wants to fence an area of 1.5x10^6 ft^2 in a rectangular field and then divide it to the half with a parallel fence at one side of the rectangle...

Hey, thanks a lot! nou it is much more clear for me!

Hi, I want to know that, the fact that an object reaches its max velocity, does it mean that has reached its max aceleration?? This is my argument: No, because in a car race, the one that is in first place doesn't mean that it has the higher aceleration... is it correct??... thanks...

I have a doubt... Hi, I want to know, why do we use tanks with cylinder forms for fuel transportation and not with another geometric form, like a 3D rectangle (i don't know the english word for it... :smile:) ? thanks...