1Water and then oil (which don't mix) are poured into a U-shaped tube, open at both endsThey come to equilibrium as shown in the figure (d1 25.5 cm and d2 9.13 cm)What is the density of the oil? [Hint: Pressures at points a and b are equal.]I know that you have 2 equations and set them equal to each other, but my answer is continuously wrong2A spherical balloon has a radius of 7.85 m and is filled with heliumHow large a cargo can it lift, assuming that the skin and structure of the balloon have a mass of 1200 kg? Neglect the bouyant force on the cargo volume itself.3A 3.25 kg piece of wood (SG 0.50) floats on waterWhat minimum mass of aluminum, hung from the wood by a string, will cause it to sink?Thanks for the help in advanceAlso show work please.
3) Buoyant force (V wood SG water + V Al SG water) g ( SG water 1 ) Buoyant force (V wood + V Al) g V wood 6.5 litres Gravity force on wood and aluminium ( 3.25 + V(Al) 2.7 ) g 6.5 + V(Al) 3.25 + 2.7 V( Al) 3.25 1.7 V(Al) V(al) 1.91 litres Mass of Al will be 1.91 2.7 5.16 kg Have to goNumber 1 needs the diagram - no idea where d1 and d2 are measured from.
3is true since S has to accept 2 electrons in order to become a S^2- ion.
