Hubble's law states that galaxies are receding from us with a speed v directly proportional to its distance d: v = hd, where h is the hubble constant. critical density p. of the universe is the average 3h2 where g is the gravitational 8/tg density of matter required just to halt its expansion. show that pc = constant

Gas cloud 1 is likely to form a star. gas cloud 2 is not. based on this information, match the given conditions with each cloud

Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.1 m below the tank bottom which is a = 7.4 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute)

If the new moon happens on january 15th, what shape will it be on february 6th?