1.A large balloon used to sample the upper atmosphere is filled with835m³ofhelium. What is the mass of thehelium(in kg)? ........kg

2.The depth of the Pacific Ocean in the Mariana Trench is 36,198 ft. What is the gauge pressure at this depth? .........psi

3.Use the following table to determine which of the other materials from the list would float if placed in a container of ethyl alcohol. Select all correct answers.

Substance	Density (kg/m3)
concrete	2,500
ebony wood	1,200
ethyl alcohol	791
gold	19,300
ice	917
juniper wood	560

• concrete
• ebony wood
• goldicej
• uniper wood
• None of the above materials would float; they are all solids and would sink in a liquid.