use Archimedes’ principle to calculate the volume (in m3) of helium needed if a helium balloon is to lift a load of 161 kg? (NB: Ignore the weight of the balloon; take the mass density of air and helium as 1.737 kg/m3 and 0.11kg/m3 respectively.)

Moon effect. some people believe that the moon controls their activities. if the moon moves from being directly on the opposite side of earth from you to being directly overhead, by what percentage does (a) the moon's gravitational pull on you increase and (b) your weight (as measured on a scale) decrease? assume that the earth–moon (center-to-center) distance is 3.82 × 10^8 m, earth's radius is 6.37 × 10^6 m, moon's mass is 7.36 × 10^22 kg, and earth's mass is 5.98 × 10^24 kg.

There are weak or strong attractive forces between atoms of liquids with a high viscosity

Which process is represented by the pv diagram? a. the isobaric process b. the isovolumetric process c. the isothermal process d. the adiabatic process