The average particle density in the milky way galaxy is about one particle per cubic centimeter. express this number in si units kg/m^3. assume that the universe is made up of 70% hydrogen and 30% helium. be very detailed with how you come up with the numbers..

In all trials, the magnitude of the final velocity for g1 + g2 was less than the magnitude of any initial velocity. as mass increased, what happened to the velocity? the velocity decreased. the velocity increased. the velocity of g1 + g2 could not be measured. the velocity was not affected by the mass increase.

An automobile steering wheel is shown. what is the ideal mechanical advantage? if the ama is 8, what is the efficiency of the steering wheel?

Asystematic approach to problem solving is called a (an)