Thermodynamic arguments put the current number density of these background neutrinos at . If only one species of neutrino has mass, what must its mass be if it makes up dark matter

Aboat that travels with constant speed of 6.10 m/s in still water is to go directly across a river. the current in the river flows at 1.95 m/s. (a) at what angle must the boat be steered?

Bone-strengthening physical activity done increases bone-mineral content and bone density in youth.

Amanometer is used to measure the air pressure in a tank. the fluid used has a specific gravity of 1.25, and the differential height between the two arms of the manometer is 34 in. if the local atmospheric pressure is 12.7 psia, determine the absolute pressure in the tank for the cases of the