# Search results

1. ### Hydrostatics with density and area

1. Homework Statement A dam is made which is rectangular and flat in profile. It is a depth of 25m and a width of 100m and holds back fresh water which has a density of 1000 kg m3 . What is the total force that the water exerts on the dam? 2. Homework Equations F=ρA |dF|=pdA d/dz p=-ρg 3...
2. ### Linear Expansion equations

1. Homework Statement An object has a density of 1250 kg /m3 at 10◦C and a coefficient of linear expansion of α = 2.5 × 10−5 1 /K . What is the object’s density when the temperature is 25◦C? 2. Homework Equations V=βV0ΔT V(T)=(1+β(Δt))V0 3. The Attempt at a Solution How I got the answer...
3. ### Hydrostatics: pressure and forces and density

A 5.0 kg cube of metal has a density of 3000 kg m3 and is held by a vertical string while immersed in water which has a density of 1000 kg m3 . Assume that the cube is oriented so that all the faces are either vertical or horizontal. 1. What is the difference in pressure between the top of the...
4. ### Thermodynamics question: density, linear expansion and temperature

An object has a density of 1250 kg m3 at 10◦C and a coefficient of linear expansion of α = 2.5 × 10−5 1 /K . What is the object’s density when the temperature is 25◦C? I have tried using the equation ΔL=αL° ΔT but this equation has nothing to do with density. the answer should be: 1248.6 Your...