1. The problem statement, all variables and given/known data Problem A) The brick A has a mass of 2.0kg and the brick B has a mass of 3.0kg. As you can see they are bound together via a dyno and is draged by the constant speed v = 2.5m/s The dynos force never changes, meaning they will always have the force 12 N and 7 N. How big is the frictionforces that acts upon the bricks under the movement of those same bricks? [Broken] Problem B) The dynos each weigh 0.15kg and the weights each weigh 0.35kg [Broken] What does the dynos show? Problem C) An empty beaker weighs 67.0g, when 100 ml fluid is poured into that beaker it suddenly weighs 153.3g. Calculate the fluid's density. Problem D) 200 sheets of paper weighs 1.0kg, the length and width of the papers are 29.6 cm and 21.0 cm and the height of those papers is 16 mm. What density does these papers have? Problem E) A container with a circular bottom is partly filled with ethanol(see picture) Calculate the liquid pressure at the container's bottom. [Broken] Problem F) The water pressure in a waterpipeline(not sure if this is the correct translation) at a house is 200 kPa. The mouth of the water tap has an area of 0.5cm2. With how much power do you have to press your finger against the opening if you open the water tap fully and try to resist the water power. (I hope this one makes sense to some of you, my teacher had left out some words so I had to fill in to the best of my ability). Last problem G) The figure shows a cuboid of iron. You want to set the iron block on a surface so that the pressure against the surface becomes as large as possible. Determine the maximum pressure. [Broken] 3. The attempt at a solution Problem C solution: P = m/V. 153.3 - 67 = 86.3 g. 100 ml of fluid weighs 86.3 g, P = m/V = 86.3/100 = 0.863 g/ml. is this the correct density? Problem D solution. P = m/V. m = 1kg(1000g) V = width * length * height = 29.6 * 21 * 1.6 = 994.56cm^3. 1000/994.56 = 1.005. The density is 1.005g/cm^3. Is this also correct? I am very sorry to say that I am clueless with the other problems, any comments that will put me to the right track of solving these is extremely appreciated. I just want to take a few sentences and say that this seems to be a great forum with a lot of intelligent people which is rare to find, I am extremely grateful that a forum such as this is open to everybody. This forum even has a special place where you can get help with your homework no matter how simple/hard. Those people who helps people here actually plays a larger part than the teachers in a lot of ways and I thank you all.