Recent content by suzukits

anyone ? please

Homework Statement A solid cube of foam plastic has a volume of 25m^3 and a density of 800kg/m^3. How large a force is required to hold it under water? Homework Equations P = F/A Fb = ρgV ρ = m/V The Attempt at a Solution ρ = m/V 800 = m / 0.000025 m = 0.02kg so F = mg = 0.02...

Thank you so much!

Oh okay, and I can use the same formula for both cases? (p*V*g)

I'm really confused about the buoyant force. What I've understood is that the buoyant force of an object is equal to the volume of the displaced fluid even if it is floating (not fully immersed in the fluid). How can this be possible? The volume of the object is the amount of water displaced...

but what exactly does "gain in potential energy per second" mean? is it just 8? since that's the velocity

Does that mean that the answer should be in Watts? Since its J/s?

Homework Statement A car of weight 7000N travels at a steady speed of 8m/s up a steady incline at 15degrees above the horizontal. The car's motion is opposed by a constant frictional force of 500N. Homework Equations Calculate: a) the gain in p.e per second b) the work done per second...