Question 1: A particular object weighs 343 N in air and 144 N when immersed in alcohol of density 0.7 g/cm3. What are the volume and the density of the object?
Question 2: In order to lift a wire ring of radius 2.25 cm from the surface of a container of blood plasma, a vertical force of 1.30 x 10-2 N greater than the weight of the ring is required. Calculate the surface tension of blood plasma from this information.