The helium balloon you got on your birthday has almost entirely deflated, but there is still a very small amount of 4 He inside with a total mass of 160 amu. How many protons, neutrons, and electrons are present in the balloon (assuming only 4 He is there)

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?

How do the kidneys affect homeostasis

Use the profile illustrated for problem (1). assume that the layer of silty sand fill (sm) is placed over the entire site. estimate the thickness of the fill (h - in feet) that will cause the effective vertical stress at the center of the clay layer to increase by 517.5 pounds per square foot.